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Cheap flights from Portugal to Illinois from $305

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portugal to Illinois departing on 2/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Portugal to Illinois

Recent round-trip flight deals from Portugal to Illinois

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
5:35 pm - 4:45 pmOPO-ORD
29h 10m1 stop
Scandinavian Airlines Logo
7:20 pm - 4:55 pmORD-OPO
15h 35m1 stop
$437Scandinavian Airlines
Find Deal
Fri, Nov 14 - Thu, Nov 27
Scandinavian Airlines Logo
4:55 pm - 4:45 pmLIS-ORD
29h 50m1 stop
Scandinavian Airlines Logo
7:20 pm - 4:05 pmORD-LIS
14h 45m1 stop
$442Scandinavian Airlines
Find Deal
Wed, Feb 4 - Sat, Feb 28
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmOPO-ORD
27h 00m1 stop
TAP AIR PORTUGAL Logo
8:25 pm - 3:20 pmORD-OPO
12h 55m1 stop
$548TAP AIR PORTUGAL
Find Deal
Tue, Nov 11 - Sun, Nov 16
Aer Lingus Logo
10:50 am - 5:55 pmLIS-ORD
13h 05m1 stop
Aer Lingus Logo
3:50 pm - 10:10 amORD-LIS
12h 20m1 stop
$548Aer Lingus
Find Deal
Tue, Nov 11 - Sun, Nov 16
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmOPO-ORD
27h 00m1 stop
TAP AIR PORTUGAL Logo
8:25 pm - 1:00 pmORD-OPO
10h 35m1 stop
$550TAP AIR PORTUGAL
Find Deal
Tue, Nov 11 - Sun, Nov 16
Aer Lingus Logo
10:50 am - 5:55 pmLIS-ORD
13h 05m1 stop
Aer Lingus Logo
3:50 pm - 10:10 amORD-LIS
12h 20m1 stop
$560Aer Lingus
Find Deal
Mon, Dec 8 - Fri, Dec 12
American Airlines Logo
7:05 pm - 3:25 pmFAO-ORD
26h 20m1 stop
American Airlines Logo
8:40 pm - 5:45 pmORD-FAO
15h 05m1 stop
$824American Airlines
Find Deal
Mon, Nov 10 - Wed, Nov 19
United Airlines Logo
1:25 pm - 9:50 amFAO-ORD
50h 25m2 stops
United Airlines Logo
7:35 pm - 12:20 pmORD-FAO
34h 45m2 stops
$826United Airlines
Find Deal
Sat, Nov 15 - Tue, Nov 25
United Airlines Logo
1:25 pm - 6:45 pmFAO-ORD
35h 20m2 stops
United Airlines Logo
7:00 am - 12:40 pmORD-FAO
23h 40m2 stops
$838United Airlines
Find Deal
Sat, Nov 15 - Sat, Nov 22
American Airlines Logo
10:55 am - 7:30 pmLIS-STL
14h 35m2 stops
American Airlines Logo
4:49 pm - 6:55 pmSTL-LIS
20h 06m2 stops
$843American Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8

Scandinavian Airlines flights from Portugal to Illinois

Our best Scandinavian Airlines deals on Portugal to Illinois flight tickets
Scandinavian Airlines
Nov 14
OPO5:35 pmPorto
29h 10m
1 stop
ORD4:45 pmChicago O'Hare Intl
Nov 27
ORD7:20 pmChicago O'Hare Intl
15h 35m
1 stop
OPO4:55 pmPorto
$437
Find similar
Scandinavian Airlines
Feb 4
LIS4:55 pmLisbon Humberto Delgado
29h 50m
1 stop
ORD4:45 pmChicago O'Hare Intl
Feb 28
ORD7:20 pmChicago O'Hare Intl
14h 45m
1 stop
LIS4:05 pmLisbon Humberto Delgado
$442
Find similar
Scandinavian Airlines
Nov 14
OPO5:35 pmPorto
29h 10m
1 stop
ORD4:45 pmChicago O'Hare Intl
Nov 27
ORD7:20 pmChicago O'Hare Intl
15h 35m
1 stop
OPO4:55 pmPorto
$461
Find similar

Aer Lingus flights from Portugal to Illinois

Our best Aer Lingus deals on Portugal to Illinois flight tickets
Aer Lingus
Nov 11
LIS10:50 amLisbon Humberto Delgado
13h 05m
1 stop
ORD5:55 pmChicago O'Hare Intl
Nov 16
ORD3:50 pmChicago O'Hare Intl
12h 20m
1 stop
LIS10:10 amLisbon Humberto Delgado
$548
Find similar
Aer Lingus
Dec 8
LIS10:50 amLisbon Humberto Delgado
13h 05m
1 stop
ORD5:55 pmChicago O'Hare Intl
Dec 12
ORD3:50 pmChicago O'Hare Intl
12h 20m
1 stop
LIS10:10 amLisbon Humberto Delgado
$560
Find similar
Aer Lingus
Nov 20
LIS10:50 amLisbon Humberto Delgado
13h 05m
1 stop
ORD5:55 pmChicago O'Hare Intl
Dec 4
ORD3:50 pmChicago O'Hare Intl
12h 20m
1 stop
LIS10:10 amLisbon Humberto Delgado
$605
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portugal to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 14, 2025.
Use the filters below to find and compare flights from Portugal to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 11/14

5:35 pm-4:45 pm

1 stop29h 10m

Chicago O'Hare Intl

Thu 11/27

7:20 pm-4:55 pm

1 stop15h 35m

$437

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Wed 2/4

4:55 pm-4:45 pm

1 stop29h 50m

Chicago O'Hare Intl

Sat 2/28

7:20 pm-4:05 pm

1 stop14h 45m

$442

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 11/11

6:00 pm-3:00 pm

1 stop27h 00m

Chicago O'Hare Intl

Sun 11/16

8:25 pm-3:20 pm

1 stop12h 55m

$548

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Tue 11/11

10:50 am-5:55 pm

1 stop13h 05m

Chicago O'Hare Intl

Sun 11/16

3:50 pm-10:10 am

1 stop12h 20m

$548

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 11/11

6:00 pm-3:00 pm

1 stop27h 00m

Chicago O'Hare Intl

Sun 11/16

8:25 pm-1:00 pm

1 stop10h 35m

$550

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Mon 12/8

10:50 am-5:55 pm

1 stop13h 05m

Chicago O'Hare Intl

Fri 12/12

3:50 pm-10:10 am

1 stop12h 20m

$560

FaroChicago

FAO - ORD

FAOORD

Faro

Mon 11/10

7:05 pm-3:25 pm

1 stop26h 20m

Chicago O'Hare Intl

Wed 11/19

8:40 pm-5:45 pm

1 stop15h 05m

$824

FaroChicago

FAO - ORD

FAOORD

Faro

Sat 11/15

1:25 pm-9:50 am

2 stops50h 25m

Chicago O'Hare Intl

Tue 11/25

7:35 pm-12:20 pm

2 stops34h 45m

$826

FaroChicago

FAO - ORD

FAOORD

Faro

Sat 11/15

1:25 pm-6:45 pm

2 stops35h 20m

Chicago O'Hare Intl

Sat 11/22

7:00 am-12:40 pm

2 stops23h 40m

$838

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 12/4

10:55 am-7:30 pm

2 stops14h 35m

Lambert-St Louis

Mon 12/8

4:49 pm-6:55 pm

2 stops20h 06m

$843

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Portugal to Illinois

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 cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Portugal is in February. Flight prices, which tend to average around $643, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $710.

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

The cheapest day to depart from Portugal to Illinois is on a Thursday when prices can be found for as low as $748. Flights from Portugal to Illinois on a Friday will generally be more expensive and average around $1,209. 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 Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Portugal to Illinois during this time can be as low as $622. Flights in the morning are often more expensive with an average ticket price of $1,209.

What is the cheapest Portugal to Illinois flight route?

Fly from Lisbon Humberto Delgado to Chicago O'Hare Intl for the best Portugal - Illinois flight prices

What cabin class options are available on Portugal to Illinois flights?

There are 3 cabin classes available to choose from on Portugal to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Portugal to Illinois flights?

You could potentially save up to 12% on your flight if you consider stops on a Portugal to Illinois flight.

Cheap Portugal to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portugal to Illinois

Best Price Found

$670

Fastest flight time

9h 10m

Direct flights

Mon, Thu, Fri, Sat and Sun

Airports in Illinois

1 airport
The best one-way flight to Illinois from Portugal in the past 72 hours is $670. The best round-trip flight deal from Portugal to Illinois found on momondo in the last 72 hours is $884.
The fastest flight from Portugal to Illinois takes 9h 10m
Direct flights go from Portugal to Illinois on Monday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)
Search flight deals

  • When did momondo last update prices for flights from Portugal to Illinois?

    Prices for flights from Portugal to Illinois were last updated today.

  • How many operators does momondo search for flights from Portugal to Illinois?

  • How old do you have to be to fly from Portugal to Illinois?

    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 Portugal to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The required travel and health documents for your Illinois 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 Illinois. 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 Portugal to Illinois?

Best airlines flying from Portugal to Illinois

Compare and see reviews for airlines that fly from Portugal to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Aer LingusPriceFrom $579Free CancellationRating
7.2
1,336 reviews
Search Aer Lingus flights
TAP AIR PORTUGALPriceFrom $580Free CancellationRating
7.1
2,015 reviews
Search TAP AIR PORTUGAL flights
DeltaPriceFrom $650Free CancellationRating
7.9
7,975 reviews
Search Delta flights
KLMPriceFrom $653Free CancellationRating
7.7
1,402 reviews
Search KLM flights
United AirlinesPriceFrom $733Free CancellationRating
7.4
8,976 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Portugal to Illinois?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portugal to Illinois. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Portugal to Illinois with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Portugal to Illinois flights to just show those with flexible booking policies.

How can momondo help me find flights from Portugal to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Portugal.

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

If you are not ready to book a flight from Portugal to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.

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