What airlines fly to Sofia?

Lufthansa, Turkish Airlines and LOT are the top three most popular airlines that fly to Sofia from Chicago according to our data. Lufthansa is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 10 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Chicago to Sofia?

Air France and KLM are the most popular carriers operating from Chicago to Sofia

Which layover airport offers the lowest fares from Chicago to Sofia?

Flights via Paris (CDG) offer the lowest average round-trip price of $706.

Which airport is the most popular layover for flights between Chicago and Sofia?

Istanbul (IST) was the most common stop: 34% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from Chicago to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 12h 07m.

Which layover airport has the shortest connection time from Chicago to Sofia?

Warsaw (WAW) has the shortest average layover time for this route: 1h 42m.

When did momondo last update prices for flights from Chicago to Sofia Airport?

Prices for flights from Chicago to Sofia Airport were last updated today.

How many operators does momondo search for flights from Chicago to Sofia Airport?

As of December 2025, there are 10 operators available to choose from for flights from Chicago to Sofia Airport.

How old do you have to be to fly from Chicago to Sofia Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents required for your trip to Sofia Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sofia Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$256 Cheap Flights from Chicago to Sofia in 2025/26

Q: What is the typical price of a round-trip flight between Chicago and Sofia?

Prices are currently low for flights on this route. Typical prices usually range from $661 to $969. The lowest price recently found on this route was $556.

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Find the cheapest flights from Chicago to Sofia

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:25 am - 3:00 pm

ORD

SOF

19h 35m1 stop

9:35 am - 10:05 pm

SOF

ORD

20h 30m1 stop

$556Turkish Airlines

Tue, May 5 - Wed, Oct 21

11:50 am - 3:10 pm

ORD

SOF

19h 20m1 stop

9:35 am - 7:25 pm

SOF

ORD

16h 50m1 stop

$561Turkish Airlines

Fri, Mar 6 - Mon, Mar 9

9:05 pm - 10:45 pm

ORD

SOF

17h 40m2 stops

6:00 am - 11:10 am

SOF

ORD

13h 10m1 stop

$563Lufthansa

Mon, Jan 19 - Tue, Feb 3

5:50 pm - 6:00 pm

ORD

SOF

16h 10m2 stops

6:25 am - 1:25 pm

SOF

ORD

15h 00m1 stop

$569Multiple Airlines

Sat, Jan 31 - Sat, Feb 7

9:55 pm - 5:50 pm

ORD

SOF

11h 55m1 stop

2:40 pm - 7:50 pm

SOF

ORD

13h 10m1 stop

$571LOT

Thu, Jan 15 - Mon, Apr 20

6:25 pm - 10:45 pm

ORD

SOF

20h 20m1 stop

6:00 am - 3:20 pm

SOF

ORD

17h 20m1 stop

$576Lufthansa

Sun, Dec 28 - Thu, Jan 15

9:55 pm - 5:50 pm

ORD

SOF

11h 55m1 stop

2:35 pm - 8:00 pm

SOF

ORD

13h 25m1 stop

$578LOT

Sat, Jan 31 - Sat, Feb 7

12:46 pm - 1:55 pm

MDW

SOF

17h 09m2 stops

7:00 am - 5:40 pm

SOF

MDW

18h 40m2 stops

$624Multiple Airlines

Tue, Feb 24 - Sun, Mar 8

1:00 pm - 2:00 pm

MDW

SOF

17h 00m2 stops

7:00 am - 4:25 pm

SOF

MDW

17h 25m2 stops

$628KLM

Mon, Apr 20 - Mon, Apr 27

1:28 pm - 2:05 pm

MDW

SOF

16h 37m2 stops

7:00 am - 5:55 pm

SOF

MDW

17h 55m2 stops

$630KLM

Wed, Mar 4 - Mon, Mar 9

United Airlines flights from Chicago to Sofia

Our best United Airlines deals on Chicago to Sofia flight tickets

United Airlines

Dec 28

ORD6:00 pmChicago O'Hare Intl

20h 45m

1 stop

SOF10:45 pmSofia

Jan 15

SOF6:00 amSofia

17h 20m

1 stop

ORD3:20 pmChicago O'Hare Intl

$610

Find similar

United Airlines

Jan 29

ORD9:50 pmChicago O'Hare Intl

16h 55m

1 stop

SOF10:45 pmSofia

Feb 2

SOF6:10 amSofia

17h 10m

1 stop

ORD3:20 pmChicago O'Hare Intl

$611

Find similar

United Airlines

Jan 29

ORD6:00 pmChicago O'Hare Intl

20h 45m

1 stop

SOF10:45 pmSofia

Feb 2

SOF6:10 amSofia

22h 00m

2 stops

ORD8:10 pmChicago O'Hare Intl

$614

Find similar

KLM flights from Chicago to Sofia

Our best KLM deals on Chicago to Sofia flight tickets

KLM

Apr 20

MDW1:00 pmChicago Midway

17h 00m

2 stops

SOF2:00 pmSofia

Apr 27

SOF7:00 amSofia

17h 25m

2 stops

MDW4:25 pmChicago Midway

$628

Find similar

KLM

Mar 4

MDW1:28 pmChicago Midway

16h 37m

2 stops

SOF2:05 pmSofia

Mar 9

SOF7:00 amSofia

17h 55m

2 stops

MDW5:55 pmChicago Midway

$630

Find similar

KLM

Jan 10

MDW1:28 pmChicago Midway

16h 37m

2 stops

SOF2:05 pmSofia

Feb 2

SOF7:00 amSofia

18h 29m

2 stops

MDW5:29 pmChicago Midway

$672

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Tue 5/5

11:25 am-3:00 pm

1 stop19h 35m

Sofia

Wed 10/21

9:35 am-10:05 pm

1 stop20h 30m

$556

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Fri 3/6

11:50 am-3:10 pm

1 stop19h 20m

Sofia

Mon 3/9

9:35 am-7:25 pm

1 stop16h 50m

$561

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 1/19

9:05 pm-10:45 pm

2 stops17h 40m

Sofia

Tue 2/3

6:00 am-11:10 am

1 stop13h 10m

$563

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 1/31

5:50 pm-6:00 pm

2 stops16h 10m

Sofia

Sat 2/7

6:25 am-1:25 pm

1 stop15h 00m

$569

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 1/15

9:55 pm-5:50 pm

1 stop11h 55m

Sofia

Mon 4/20

2:40 pm-7:50 pm

1 stop13h 10m

$571

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 12/28

6:25 pm-10:45 pm

1 stop20h 20m

Sofia

Thu 1/15

6:00 am-3:20 pm

1 stop17h 20m

$576

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 1/31

9:55 pm-5:50 pm

1 stop11h 55m

Sofia

Sat 2/7

2:35 pm-8:00 pm

1 stop13h 25m

$578

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Tue 2/24

12:46 pm-1:55 pm

2 stops17h 09m

Sofia

Sun 3/8

7:00 am-5:40 pm

2 stops18h 40m

$624

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Mon 4/20

1:00 pm-2:00 pm

2 stops17h 00m

Sofia

Mon 4/27

7:00 am-4:25 pm

2 stops17h 25m

$628

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Wed 3/4

1:28 pm-2:05 pm

2 stops16h 37m

Sofia

Mon 3/9

7:00 am-5:55 pm

2 stops17h 55m

$630

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 Chicago to Sofia

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

Layovers

What is the typical price of a round-trip flight between Chicago and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Chicago is in February. Flight prices, which tend to average around $565, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Sofia from Chicago during March instead. Flights to Sofia in March, while not as cheap as those in February, still average around $587.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Thursday is the cheapest day to fly to Sofia from Chicago. The lowest ticket price found for a Thursday departure recently was $871. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Chicago to Sofia on a Saturday will generally be more expensive and average around $1,039. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the morning is the cheapest time of day to fly from Chicago to Sofia when you can find flight prices for as low as $801. Flying to Sofia in the morning is an ideal time because this is during off-peak travel hours. At noon is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,145 per ticket.

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $753 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Chicago for as low as $716 on momondo.

Can stopping save me money on Chicago to Sofia flights?

You could potentially save up to 14% on your flight if you consider stops on a Chicago to Sofia flight.

How have Chicago to Sofia flight prices changed over time?

As of December 2025, prices for Chicago to Sofia flights are approximately 9% cheaper when compared to flights at the same time last year.

When to book flights from Chicago to Sofia

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

Estimated round-trip price

Cheap Chicago to Sofia (CHI to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Sofia

Fastest flight time	13h 20m
Direct flights	None

The fastest flight from Chicago to Sofia takes 13h 20m

There are no direct flights from Chicago to Sofia. There are no popular flight routes from Chicago to Sofia.

Search flight deals

How far is Chicago to Sofia by plane?
A flight from Chicago to Sofia will travel around 5185.9 mi. A reasonable flight in good conditions will take 13h 20m.
When did momondo last update prices for flights from Chicago to Sofia Airport?
Prices for flights from Chicago to Sofia Airport were last updated today.
How many operators does momondo search for flights from Chicago to Sofia Airport?
As of December 2025, there are 10 operators available to choose from for flights from Chicago to Sofia Airport.
How old do you have to be to fly from Chicago to Sofia Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents required for your trip to Sofia Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sofia Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Chicago to Sofia?
momondo data reveals that the most frequently booked airline on the route from Chicago to Sofia is Lufthansa, representing 26% of all bookings. The subsequent popular airlines are Turkish Airlines at 26%, LOT at 17%, and United Airlines at 14%.

Best airlines flying from Chicago to Sofia

Compare and see reviews for airlines that fly from Chicago to Sofia with momondo

Airline	Rating	Free Cancellation	Price
Turkish Airlines	PriceFrom $511	Free Cancellation	Rating 7.3 4,105 reviews	Search Turkish Airlines flights
KLM	PriceFrom $569	Free Cancellation	Rating 7.7 1,428 reviews	Search KLM flights
Air France	PriceFrom $585	Free Cancellation	Rating 7.4 1,507 reviews	Search Air France flights
United Airlines	PriceFrom $585	Free Cancellation	Rating 7.4 9,092 reviews	Search United Airlines flights
LOT	PriceFrom $587	Free Cancellation	Rating 7.5 1,149 reviews	Search LOT flights
Lufthansa	PriceFrom $588	Free Cancellation	Rating 6.8 7,635 reviews	Search Lufthansa flights
SWISS	PriceFrom $593	Free Cancellation	Rating 7.5 1,815 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $606	Free Cancellation	Rating 7.6 879 reviews	Search Austrian Airlines flights
British Airways	PriceFrom $611	Free Cancellation	Rating 6.7 7,585 reviews	Search British Airways flights
Air Serbia	PriceFrom $632	Free Cancellation	Rating 6.2 210 reviews	Search Air Serbia flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to Sofia. momondo saves you time and could save you money on your trip.

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

momondo does allow users to show only those flights to Sofia from Chicago which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Chicago and Sofia by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Chicago to Sofia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Sofia, momondo offers a useful price alert feature which will track prices for flights to Sofia from Chicago and alert you when they change.

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

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Cheap flights from Chicago to Sofia from $256

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to Sofia departing on 1/11. 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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Filter for what you want

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Cheap round-trip flights

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United Airlines flights from Chicago to Sofia

Our best United Airlines deals on Chicago to Sofia flight tickets

KLM flights from Chicago to Sofia

Our best KLM deals on Chicago to Sofia flight tickets

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Use the filters below to find and compare flights from Chicago to Sofia that are best for you.

See travel insights to Sofia from

How to get the cheapest flight ticket from Chicago to Sofia

What is the typical price of a round-trip flight between Chicago and Sofia?

What is the cheapest month to fly to Sofia?

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight to Sofia?

How far in advance should I book a flight to Sofia?

Can stopping save me money on Chicago to Sofia flights?

You could potentially save up to 14% on your flight if you consider stops on a Chicago to Sofia flight.

How have Chicago to Sofia flight prices changed over time?

As of December 2025, prices for Chicago to Sofia flights are approximately 9% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Chicago to Sofia?

Air France and KLM are the most popular carriers operating from Chicago to Sofia

What airlines fly to Sofia?

Which airport is the most popular layover for flights between Chicago and Sofia?

Istanbul (IST) was the most common stop: 34% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Chicago to Sofia?

Flights via Paris (CDG) offer the lowest average round-trip price of $706.

Which layover airport has the shortest travel time from Chicago to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 12h 07m.

Which layover airport has the shortest connection time from Chicago to Sofia?

Warsaw (WAW) has the shortest average layover time for this route: 1h 42m.

When to book flights from Chicago to Sofia

Cheap Chicago to Sofia (CHI to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago to Sofia

Fastest flight time

Direct flights

How far is Chicago to Sofia by plane?

When did momondo last update prices for flights from Chicago to Sofia Airport?

How many operators does momondo search for flights from Chicago to Sofia Airport?

How old do you have to be to fly from Chicago to Sofia Airport?

What documentation or ID do you need to fly to Sofia Airport?

What is the most popular airline from Chicago to Sofia?

Best airlines flying from Chicago to Sofia

Compare and see reviews for airlines that fly from Chicago to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

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

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

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

I’m not ready to book a flight from Chicago to Sofia right now. Can momondo alert me if prices change?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo