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Cheap flights from Portugal to Illinois from $329

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 9/3. 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

Scandinavian Airlines Logo
4:55 pm - 4:45 pmLIS-ORD
29h 50m1 stop
Scandinavian Airlines Logo
7:20 pm - 2:55 pmORD-LIS
13h 35m1 stop
$388Scandinavian Airlines
Find Deal
Wed, Nov 19 - 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
$389Scandinavian Airlines
Find Deal
Fri, Jan 16 - Sat, Feb 21
TAP AIR PORTUGAL Logo
6:10 pm - 4:30 pmFAO-ORD
28h 20m1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 5:20 pmORD-FAO
17h 20m1 stop
$545TAP AIR PORTUGAL
Find Deal
Thu, Sep 18 - Sun, Sep 21
TAP AIR PORTUGAL Logo
10:25 pm - 4:10 pmOPO-ORD
23h 45m1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 10:55 amORD-OPO
10h 55m1 stop
$551TAP AIR PORTUGAL
Find Deal
Thu, Sep 11 - Thu, Sep 25
Aer Lingus Logo
10:15 pm - 2:00 pmLIS-ORD
21h 45m1 stop
Aer Lingus Logo
3:45 pm - 10:15 amORD-LIS
12h 30m1 stop
$581Aer Lingus
Find Deal
Wed, Sep 17 - Sat, Sep 27
Aer Lingus Logo
10:15 pm - 2:00 pmLIS-ORD
21h 45m1 stop
Aer Lingus Logo
9:15 pm - 9:35 pmORD-LIS
18h 20m1 stop
$590Aer Lingus
Find Deal
Tue, Oct 14 - Mon, Oct 20
United Airlines Logo
6:00 am - 7:48 pmOPO-ORD
19h 48m2 stops
United Airlines Logo
1:00 pm - 9:30 amORD-OPO
14h 30m2 stops
$745United Airlines
Find Deal
Fri, Sep 5 - Wed, Nov 5
United Airlines Logo
12:30 pm - 8:05 pmOPO-ORD
13h 35m1 stop
United Airlines Logo
4:20 pm - 11:40 amORD-OPO
13h 20m1 stop
$746United Airlines
Find Deal
Mon, Nov 24 - Mon, Dec 1
American Airlines Logo
10:55 am - 9:50 pmLIS-STL
16h 55m2 stops
American Airlines Logo
6:29 pm - 2:55 pmSTL-LIS
14h 26m2 stops
$812American Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
American Airlines Logo
8:20 am - 11:56 pmOPO-STL
21h 36m2 stops
American Airlines Logo
9:12 am - 7:40 amSTL-OPO
16h 28m2 stops
$3,923American Airlines
Find Deal
Sat, Nov 22 - Mon, Dec 1

SWISS flights from Portugal to Illinois

Our best SWISS deals on Portugal to Illinois flight tickets
SWISS
Sep 5
OPO8:40 amPorto
13h 15m
1 stop
ORD3:55 pmChicago O'Hare Intl
Nov 7
ORD6:50 pmChicago O'Hare Intl
34h 25m
1 stop
OPO11:15 amPorto
$735
Find similar
SWISS
Oct 3
OPO8:40 amPorto
13h 15m
1 stop
ORD3:55 pmChicago O'Hare Intl
Oct 10
ORD7:05 pmChicago O'Hare Intl
30h 50m
1 stop
OPO7:55 amPorto
$756
Find similar
SWISS
Oct 25
OPO7:20 pmPorto
28h 00m
1 stop
ORD5:20 pmChicago O'Hare Intl
Nov 1
ORD7:50 pmChicago O'Hare Intl
34h 20m
1 stop
OPO11:10 amPorto
$763
Find similar

United Airlines flights from Portugal to Illinois

Our best United Airlines deals on Portugal to Illinois flight tickets
United Airlines
Sep 5
OPO6:00 amPorto
19h 48m
2 stops
ORD7:48 pmChicago O'Hare Intl
Nov 5
ORD1:00 pmChicago O'Hare Intl
14h 30m
2 stops
OPO9:30 amPorto
$745
Find similar
United Airlines
Nov 24
OPO12:30 pmPorto
13h 35m
1 stop
ORD8:05 pmChicago O'Hare Intl
Dec 1
ORD4:20 pmChicago O'Hare Intl
13h 20m
1 stop
OPO11:40 amPorto
$746
Find similar
United Airlines
Sep 5
OPO6:00 amPorto
19h 55m
1 stop
ORD7:55 pmChicago O'Hare Intl
Nov 9
ORD4:20 pmChicago O'Hare Intl
11h 10m
1 stop
OPO9:30 amPorto
$757
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 August 21, 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

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Wed 11/19

4:55 pm-4:45 pm

1 stop29h 50m

Chicago O'Hare Intl

Thu 11/27

7:20 pm-2:55 pm

1 stop13h 35m

$388

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Fri 1/16

4:55 pm-4:45 pm

1 stop29h 50m

Chicago O'Hare Intl

Sat 2/21

7:20 pm-4:05 pm

1 stop14h 45m

$389

FaroChicago

FAO - ORD

FAOORD

Faro

Thu 9/18

6:10 pm-4:30 pm

1 stop28h 20m

Chicago O'Hare Intl

Sun 9/21

6:00 pm-5:20 pm

1 stop17h 20m

$545

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 9/11

10:25 pm-4:10 pm

1 stop23h 45m

Chicago O'Hare Intl

Thu 9/25

6:00 pm-10:55 am

1 stop10h 55m

$551

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Wed 9/17

10:15 pm-2:00 pm

1 stop21h 45m

Chicago O'Hare Intl

Sat 9/27

3:45 pm-10:15 am

1 stop12h 30m

$581

LisbonChicago

LIS - ORD

LISORD

Lisbon Humberto Delgado

Tue 10/14

10:15 pm-2:00 pm

1 stop21h 45m

Chicago O'Hare Intl

Mon 10/20

9:15 pm-9:35 pm

1 stop18h 20m

$590

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 9/5

6:00 am-7:48 pm

2 stops19h 48m

Chicago O'Hare Intl

Wed 11/5

1:00 pm-9:30 am

2 stops14h 30m

$745

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 11/24

12:30 pm-8:05 pm

1 stop13h 35m

Chicago O'Hare Intl

Mon 12/1

4:20 pm-11:40 am

1 stop13h 20m

$746

LisbonSt. Louis

LIS - STL

LISSTL

Lisbon Humberto Delgado

Thu 12/4

10:55 am-9:50 pm

2 stops16h 55m

Lambert-St Louis

Mon 12/8

6:29 pm-2:55 pm

2 stops14h 26m

$812

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sat 11/22

8:20 am-11:56 pm

2 stops21h 36m

Lambert-St Louis

Mon 12/1

9:12 am-7:40 am

2 stops16h 28m

$3,923

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 $634, 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 May is also cheap. Prices for this month can be found on momondo for an average of $699.

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

The cheapest day to depart from Portugal to Illinois is on a Sunday when prices can be found for as low as $784. Flights from Portugal to Illinois on a Wednesday will generally be more expensive and average around $1,361. 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 $1,211.

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 1% 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

$591

Fastest flight time

9h 10m

Direct flights

Mon, Tue, 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 $591. The best round-trip flight deal from Portugal to Illinois found on momondo in the last 72 hours is $933.
The fastest flight from Portugal to Illinois takes 9h 10m
Direct flights go from Portugal to Illinois on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is TAP AIR PORTUGAL.
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
7.1
1,228 reviews
Search Aer Lingus flights
TAP AIR PORTUGALPriceFrom $580Free CancellationRating
7.1
1,959 reviews
Search TAP AIR PORTUGAL flights
DeltaPriceFrom $650Free CancellationRating
7.9
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $733Free CancellationRating
7.4
8,930 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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