What is the cheapest airline that flies from Vienna Intl to Chicago O'Hare Intl?

LOT, British Airways, and Scandinavian Airlines are the most popular carriers operating from Vienna Intl to Chicago O'Hare Intl

How often are flights from Vienna to Chicago delayed?

Historically, on average around 17% of flights between Vienna and Chicago have experienced a delay on any given week. The average delay length over the past 12 months has been 172 minutes.

How many flights depart from Vienna to Chicago O'Hare Intl Airport on average per week?

8 flights are operational weekly from Vienna to Chicago O'Hare Intl Airport as of November 2025. The most popular departure day for this route is Wed, with 38% of flights per week taking off on this day.

Which layover airport offers the lowest fares from Vienna to Chicago O'Hare Intl Airport?

Flights via Dublin (DUB) offer the lowest average round-trip price of $475.

What airlines fly to Chicago O'Hare Intl Airport?

Austrian Airlines, United Airlines and British Airways are the top three most popular airlines that fly to Chicago O'Hare Intl Airport from Vienna according to our data. Austrian Airlines is the first choice among our users, with 66% of people opting to fly with this airline when traveling to Chicago O'Hare Intl Airport. Keep in mind that there are 4 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.

What day of the week experiences the fewest flight delays on this route?

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

Which layover airport has the shortest connection time from Vienna to Chicago O'Hare Intl Airport?

London (LHR) has the shortest average layover time for this route: 1h 07m.

Which layover airport has the shortest travel time from Vienna to Chicago O'Hare Intl Airport?

Flights connecting via London (LHR) have the shortest average one-way travel time: 12h 35m.

Which airline has the best punctuality record on Vienna to Chicago flights?

According to our data, Austrian Airlines have had the least number of delays on this route over the last 12 months; with about 7% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between Vienna and Chicago O'Hare Intl Airport?

London (LHR) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

What is the most punctual flight time for Vienna to Chicago flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

How many flights depart from Vienna to Chicago O'Hare Intl Airport on average per day?

As of November 2025, 1 flights take off from Vienna and land in Chicago O'Hare Intl Airport each day. The most common flight departure time for this route is 8:00AM, with 100% of daily flights taking off at noon.

When did momondo last update prices for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport?

Prices for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport are updated daily.

How many operators does momondo search for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport?

The number of operators available for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport is 4 as of November 2025.

How old do you have to be to fly from Vienna Intl Airport to Chicago O'Hare Intl Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Vienna Intl Airport to Chicago O'Hare Intl Airport.

What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

The required travel and health documents for your Chicago O'Hare Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Chicago O'Hare Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$344 Cheap Flights from Vienna to Chicago O'Hare Intl Airport in 2025/26

Q: What is the typical price of a round-trip flight between Vienna and Chicago O'Hare Intl Airport?

Prices are currently low for flights on this route. Typical prices usually range from $592 to $794. The lowest price recently found on this route was $576.

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Enter your travel dates to find the best prices.

10:15 am - 4:45 pmVIE-ORD

13h 30m1 stop

7:20 pm - 9:35 amORD-VIE

31h 15m1 stop

$576Scandinavian Airlines

Find Deal

jue., nov. 20 - lun., nov. 24

10:15 am - 4:45 pmVIE-ORD

13h 30m1 stop

7:20 pm - 7:25 pmORD-VIE

17h 05m1 stop

$577Scandinavian Airlines

Find Deal

jue., dic. 25 - mié., ene. 7

8:05 pm - 4:45 pmVIE-ORD

27h 40m1 stop

7:20 pm - 9:35 amORD-VIE

31h 15m1 stop

$578Scandinavian Airlines

Find Deal

vie., dic. 5 - mié., dic. 10

8:05 pm - 4:45 pmVIE-ORD

27h 40m1 stop

7:20 pm - 9:35 amORD-VIE

31h 15m1 stop

$579Scandinavian Airlines

Find Deal

vie., nov. 21 - vie., dic. 5

9:20 am - 8:00 pmVIE-ORD

17h 40m1 stop

9:55 pm - 4:50 pmORD-VIE

11h 55m1 stop

$592LOT

Find Deal

mar., nov. 18 - mar., dic. 2

9:20 am - 8:00 pmVIE-ORD

17h 40m1 stop

9:55 pm - 6:40 pmORD-VIE

13h 45m1 stop

$593LOT

Find Deal

mar., nov. 25 - mar., dic. 2

12:25 pm - 3:25 pmVIE-ORD

34h 00m1 stop

8:15 pm - 6:50 pmORD-VIE

15h 35m1 stop

$602TAP AIR PORTUGAL

Find Deal

jue., dic. 18 - vie., ene. 30

7:40 pm - 2:45 pmVIE-ORD

26h 05m1 stop

7:10 pm - 11:25 amORD-VIE

33h 15m1 stop

$605TAP AIR PORTUGAL

Find Deal

sáb., dic. 13 - mié., dic. 31

7:50 am - 7:45 pmVIE-ORD

18h 55m2 stops

8:45 am - 3:20 pmORD-VIE

23h 35m2 stops

$621Multiple Airlines

Find Deal

vie., ene. 23 - jue., ene. 29

7:20 am - 5:20 pmVIE-ORD

17h 00m2 stops

6:30 pm - 3:25 pmORD-VIE

13h 55m2 stops

$641Multiple Airlines

Find Deal

vie., nov. 21 - mar., nov. 25

LOT flights from Vienna to Chicago O'Hare Intl Airport

Our best LOT deals on Vienna to Chicago O'Hare Intl Airport flight tickets

LOT

Nov 19

VIE9:20 amVienna Intl

17h 40m

1 stop

ORD8:00 pmChicago O'Hare Intl

Nov 24

ORD9:55 pmChicago O'Hare Intl

27h 40m

1 stop

VIE8:35 amVienna Intl

$577

Find similar

LOT

Nov 18

VIE9:20 amVienna Intl

17h 40m

1 stop

ORD8:00 pmChicago O'Hare Intl

Dec 2

ORD9:55 pmChicago O'Hare Intl

11h 55m

1 stop

VIE4:50 pmVienna Intl

$592

Find similar

LOT

Nov 25

VIE9:20 amVienna Intl

17h 40m

1 stop

ORD8:00 pmChicago O'Hare Intl

Dec 2

ORD9:55 pmChicago O'Hare Intl

13h 45m

1 stop

VIE6:40 pmVienna Intl

$593

Find similar

TAP AIR PORTUGAL flights from Vienna to Chicago O'Hare Intl Airport

Our best TAP AIR PORTUGAL deals on Vienna to Chicago O'Hare Intl Airport flight tickets

TAP AIR PORTUGAL

Dec 18

VIE12:25 pmVienna Intl

34h 00m

1 stop

ORD3:25 pmChicago O'Hare Intl

Jan 30

ORD8:15 pmChicago O'Hare Intl

15h 35m

1 stop

VIE6:50 pmVienna Intl

$602

Find similar

TAP AIR PORTUGAL

Dec 13

VIE7:40 pmVienna Intl

26h 05m

1 stop

ORD2:45 pmChicago O'Hare Intl

Dec 31

ORD7:10 pmChicago O'Hare Intl

33h 15m

1 stop

VIE11:25 amVienna Intl

$605

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Vienna to Chicago O'Hare Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

jue. 11/20

10:15 am-4:45 pm

1 stop13h 30m

Chicago O'Hare Intl

lun. 11/24

7:20 pm-9:35 am

1 stop31h 15m

$576

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

jue. 12/25

10:15 am-4:45 pm

1 stop13h 30m

Chicago O'Hare Intl

mié. 1/7

7:20 pm-7:25 pm

1 stop17h 05m

$577

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

vie. 12/5

8:05 pm-4:45 pm

1 stop27h 40m

Chicago O'Hare Intl

mié. 12/10

7:20 pm-9:35 am

1 stop31h 15m

$578

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

vie. 11/21

8:05 pm-4:45 pm

1 stop27h 40m

Chicago O'Hare Intl

vie. 12/5

7:20 pm-9:35 am

1 stop31h 15m

$579

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

mar. 11/18

9:20 am-8:00 pm

1 stop17h 40m

Chicago O'Hare Intl

mar. 12/2

9:55 pm-4:50 pm

1 stop11h 55m

$592

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

mar. 11/25

9:20 am-8:00 pm

1 stop17h 40m

Chicago O'Hare Intl

mar. 12/2

9:55 pm-6:40 pm

1 stop13h 45m

$593

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

jue. 12/18

12:25 pm-3:25 pm

1 stop34h 00m

Chicago O'Hare Intl

vie. 1/30

8:15 pm-6:50 pm

1 stop15h 35m

$602

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

sáb. 12/13

7:40 pm-2:45 pm

1 stop26h 05m

Chicago O'Hare Intl

mié. 12/31

7:10 pm-11:25 am

1 stop33h 15m

$605

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

vie. 1/23

7:50 am-7:45 pm

2 stops18h 55m

Chicago O'Hare Intl

jue. 1/29

8:45 am-3:20 pm

2 stops23h 35m

$621

ViennaChicago

VIE - ORD

VIEORD

Vienna Intl

vie. 11/21

7:20 am-5:20 pm

2 stops17h 00m

Chicago O'Hare Intl

mar. 11/25

6:30 pm-3:25 pm

2 stops13h 55m

$641

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Vienna to Chicago O'Hare Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Layovers

Other information

What is the typical price of a round-trip flight between Vienna and Chicago O'Hare Intl Airport?

What is the cheapest month to fly to Chicago O'Hare Intl Airport?

The month of November is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Vienna averaging around $650.

What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?

The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Thursday when prices can be found for as low as $750. This is often the case because there is less demand to fly during this day of the week. On the other hand, Saturday is the most expensive day to depart from Vienna because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,048.

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

Flying to Chicago O'Hare Intl Airport from Vienna in the morning is the least expensive time of day to depart. momondo users have found prices as low as $819 when looking at flights departing in the morning. Try not to purchase tickets in the afternoon because they tend to be around $1,305. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Vienna Intl to Chicago O'Hare Intl flight route?

Fly from Vienna Intl to Chicago O'Hare Intl for the best Vienna Intl - Chicago O'Hare Intl flight prices

How far in advance should I book a flight to Chicago O'Hare Intl Airport?

You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Vienna when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $715 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from Vienna for as low as $621 on momondo.

What cabin class options are available on Vienna Intl to Chicago O'Hare Intl flights?

There are 3 cabin classes available to choose from on Vienna Intl to Chicago O'Hare Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Vienna to Chicago O'Hare Intl Airport flight prices changed over time?

As of November 2025, prices for Vienna to Chicago O'Hare Intl Airport flights are approximately 3% more expensive when compared to flights at the same time last year.

When to book flights from Vienna to Chicago O'Hare Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Vienna to Chicago O'Hare Intl Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Vienna to Chicago O'Hare Intl Airport (VIE to ORD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Vienna to Chicago O'Hare Intl Airport

Best Price Found	$2,454
Fastest flight time	9h 50m
Direct flights	Every day

The best one-way flight to Chicago O'Hare Intl Airport from Vienna in the past 72 hours is $2,454. The best round-trip flight deal from Vienna to Chicago O'Hare Intl Airport found on momondo in the last 72 hours is $670.

The fastest flight from Vienna to Chicago O'Hare Intl Airport takes 9h 50m

Direct flights go from Vienna to Chicago O'Hare Intl Airport every day.

Search flight deals

How far is Vienna Intl to Chicago O'Hare Intl by plane?
Vienna Intl and Chicago O'Hare Intl are 4686.8 mi apart from one another. Flights usually cover this in 12h 55m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport?
Prices for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport are updated daily.
How many operators does momondo search for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport?
The number of operators available for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport is 4 as of November 2025.
How old do you have to be to fly from Vienna Intl Airport to Chicago O'Hare Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Vienna Intl Airport to Chicago O'Hare Intl Airport.
What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?
The required travel and health documents for your Chicago O'Hare Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Chicago O'Hare Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Vienna to Chicago O'Hare Intl Airport?
Based on momondo bookings for flights between Vienna and Chicago O'Hare Intl Airport, the leading plane model is Boeing 787-9 Dreamliner, making up 71.53% of the total bookings. Other popular models include Boeing 777-200/200ER with 18.56%, Boeing 767-400 with 3.60%, and Boeing 767-300 (winglets) with 1.80%.
What is the most popular airline from Vienna to Chicago O'Hare Intl Airport?
momondo data reveals that the most frequently booked airline on the route from Vienna to Chicago O'Hare Intl Airport is Austrian Airlines, representing 66% of all bookings. The subsequent popular airlines are United Airlines at 20%, British Airways at 8%, and Lufthansa at 6%.

Best airlines flying from Vienna to Chicago O'Hare Intl Airport

Compare and see reviews for airlines that fly from Vienna to Chicago O'Hare Intl Airport with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom $530	Free Cancellation	Rating 6.7 7,500 reviews	Search British Airways flights
Austrian Airlines	PriceFrom $570	Free Cancellation	Rating 7.6 864 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom $595	Free Cancellation	Rating 6.8 7,558 reviews	Search Lufthansa flights
United Airlines	PriceFrom $613	Free Cancellation	Rating 7.4 9,004 reviews	Search United Airlines flights

Austrian Airlines Flights From Vienna to Chicago O'Hare Intl Airport
Austrian Airlines flies from Vienna to Chicago O'Hare Intl Airport around 2 times per week, with 864 momondo users rating the airline 7.6/10. The cheapest Austrian Airlines deal from Vienna to Chicago O'Hare Intl Airport in the last 72 hours was $570 (round-trip), much lower than the average airfare cost of $754 for Austrian Airlines flights on this route.
United Airlines Flights From Vienna to Chicago O'Hare Intl Airport
United Airlines is also a popular choice for this route. United Airlines flight deals for Vienna to Chicago O'Hare Intl Airport start from as low as $613 round-trip, depending on your selected dates, with average United Airlines deals seen on momondo around $719. United Airlines operates 2 flights to Chicago O'Hare Intl Airport from Vienna in an average week. Users have rated it 7.4/10 across 9,004 reviews.

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Why should I use momondo to find a flight deal from Vienna to Chicago?

Finding the right flight to Chicago from Vienna is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Chicago quick and easy, saving you time and money.

Can I find flights from Vienna to Chicago with flexible booking policies on momondo?

All flight searches from Vienna to Chicago on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Vienna to Chicago?

Once you have performed a search for Vienna to Chicago flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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Price alerts on flights to Chicago from Vienna are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from Vienna to Chicago from $344

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Vienna to Chicago departing on 5/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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LOT flights from Vienna to Chicago O'Hare Intl Airport

Our best LOT deals on Vienna to Chicago O'Hare Intl Airport flight tickets

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Our best TAP AIR PORTUGAL deals on Vienna to Chicago O'Hare Intl Airport flight tickets

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Use the filters below to find and compare flights from Vienna to Chicago O'Hare Intl Airport that are best for you.

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How to get the cheapest flight ticket from Vienna to Chicago O'Hare Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Vienna and Chicago O'Hare Intl Airport?

What is the cheapest month to fly to Chicago O'Hare Intl Airport?

The month of November is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Vienna averaging around $650.

What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?

What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?

What is the cheapest Vienna Intl to Chicago O'Hare Intl flight route?

Fly from Vienna Intl to Chicago O'Hare Intl for the best Vienna Intl - Chicago O'Hare Intl flight prices

How far in advance should I book a flight to Chicago O'Hare Intl Airport?

What cabin class options are available on Vienna Intl to Chicago O'Hare Intl flights?

There are 3 cabin classes available to choose from on Vienna Intl to Chicago O'Hare Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Vienna to Chicago O'Hare Intl Airport flight prices changed over time?

As of November 2025, prices for Vienna to Chicago O'Hare Intl Airport flights are approximately 3% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Vienna Intl to Chicago O'Hare Intl?

LOT, British Airways, and Scandinavian Airlines are the most popular carriers operating from Vienna Intl to Chicago O'Hare Intl

What airlines fly to Chicago O'Hare Intl Airport?

How often are flights from Vienna to Chicago delayed?

Historically, on average around 17% of flights between Vienna and Chicago have experienced a delay on any given week. The average delay length over the past 12 months has been 172 minutes.

What is the most punctual flight time for Vienna to Chicago flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Vienna to Chicago flights?

According to our data, Austrian Airlines have had the least number of delays on this route over the last 12 months; with about 7% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between Vienna and Chicago O'Hare Intl Airport?

London (LHR) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Vienna to Chicago O'Hare Intl Airport?

Flights via Dublin (DUB) offer the lowest average round-trip price of $475.

Which layover airport has the shortest travel time from Vienna to Chicago O'Hare Intl Airport?

Flights connecting via London (LHR) have the shortest average one-way travel time: 12h 35m.

Which layover airport has the shortest connection time from Vienna to Chicago O'Hare Intl Airport?

London (LHR) has the shortest average layover time for this route: 1h 07m.

How many flights depart from Vienna to Chicago O'Hare Intl Airport on average per day?

As of November 2025, 1 flights take off from Vienna and land in Chicago O'Hare Intl Airport each day. The most common flight departure time for this route is 8:00AM, with 100% of daily flights taking off at noon.

How many flights depart from Vienna to Chicago O'Hare Intl Airport on average per week?

8 flights are operational weekly from Vienna to Chicago O'Hare Intl Airport as of November 2025. The most popular departure day for this route is Wed, with 38% of flights per week taking off on this day.

When to book flights from Vienna to Chicago O'Hare Intl Airport

Cheap Vienna to Chicago O'Hare Intl Airport (VIE to ORD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Vienna to Chicago O'Hare Intl Airport

Best Price Found

Fastest flight time

Direct flights

How far is Vienna Intl to Chicago O'Hare Intl by plane?

When did momondo last update prices for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport?

How many operators does momondo search for flights from Vienna Intl Airport to Chicago O'Hare Intl Airport?

How old do you have to be to fly from Vienna Intl Airport to Chicago O'Hare Intl Airport?

What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?

What is the most popular plane model from Vienna to Chicago O'Hare Intl Airport?

What is the most popular airline from Vienna to Chicago O'Hare Intl Airport?

Best airlines flying from Vienna to Chicago O'Hare Intl Airport

Compare and see reviews for airlines that fly from Vienna to Chicago O'Hare Intl Airport with momondo

Austrian Airlines Flights From Vienna to Chicago O'Hare Intl Airport

United Airlines Flights From Vienna to Chicago O'Hare Intl Airport

Traveling to a place near Chicago?

Why use momondo?

Why should I use momondo to find a flight deal from Vienna to Chicago?

Can I find flights from Vienna to Chicago with flexible booking policies on momondo?