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Cheap flights from Illinois to Portugal from $309

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Portugal departing on 8/12. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
7:15 pm - 11:05 am
ORD
-
OPO
33h 50m
1 stop
Scandinavian Airlines Logo
11:55 am - 4:45 pm
OPO
-
ORD
34h 50m
1 stop
$607Scandinavian Airlines
Mon, Nov 2 - Wed, Nov 11
Scandinavian Airlines Logo
8:15 pm - 11:05 am
ORD
-
OPO
33h 50m
1 stop
Scandinavian Airlines Logo
11:55 am - 4:45 pm
OPO
-
ORD
34h 50m
1 stop
$660Scandinavian Airlines
Sat, Oct 31 - Wed, Nov 11
Scandinavian Airlines Logo
7:15 pm - 11:05 am
ORD
-
OPO
33h 50m
1 stop
Scandinavian Airlines Logo
11:55 am - 4:45 pm
OPO
-
ORD
34h 50m
1 stop
$667Scandinavian Airlines
Mon, Nov 9 - Mon, Nov 16
TAP AIR PORTUGAL Logo
8:10 pm - 1:30 pm
ORD
-
OPO
11h 20m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 3:30 pm
OPO
-
ORD
27h 30m
1 stop
$711TAP AIR PORTUGAL
Sun, Nov 1 - Sat, Nov 14
TAP AIR PORTUGAL Logo
8:10 pm - 6:00 pm
ORD
-
OPO
15h 50m
1 stop
TAP AIR PORTUGAL Logo
7:00 am - 3:30 pm
OPO
-
ORD
14h 30m
1 stop
$713TAP AIR PORTUGAL
Sun, Nov 1 - Sun, Nov 8
United Airlines Logo
2:00 pm - 8:10 am
STL
-
LIS
12h 10m
1 stop
United Airlines Logo
11:20 am - 4:40 pm
LIS
-
STL
35h 20m
2 stops
$779United Airlines
Wed, Nov 4 - Tue, Nov 10
United Airlines Logo
11:45 am - 8:10 am
STL
-
LIS
14h 25m
1 stop
United Airlines Logo
11:20 am - 4:40 pm
LIS
-
STL
35h 20m
2 stops
$780United Airlines
Wed, Nov 4 - Tue, Nov 10
Air Canada Logo
9:23 am - 9:50 am
STL
-
LIS
18h 27m
2 stops
Air Canada Logo
11:20 am - 2:18 pm
LIS
-
STL
32h 58m
2 stops
$783Air Canada
Mon, Nov 16 - Wed, Nov 18
Multiple Airlines Logo
5:20 pm - 8:10 am
STL
-
LIS
32h 50m
1 stop
Multiple Airlines Logo
11:20 am - 12:20 pm
LIS
-
STL
31h 00m
2 stops
$786Multiple Airlines
Sat, Nov 14 - Tue, Nov 24
Multiple Airlines Logo
11:45 am - 11:30 pm
ORD
-
FAO
29h 45m
2 stops
Multiple Airlines Logo
6:35 am - 2:25 pm
FAO
-
ORD
13h 50m
1 stop
$816Multiple Airlines
Tue, Sep 22 - Mon, Sep 28

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United Airlines flights from Illinois to Portugal

Our best United Airlines deals on Illinois to Portugal flight tickets
United Airlines
Nov 4
STL6:30 amLambert-St Louis
19h 40m
1 stop
LIS8:10 amLisbon Humberto Delgado
Nov 10
LIS11:20 amLisbon Humberto Delgado
35h 20m
2 stops
STL4:40 pmLambert-St Louis
$779
United Airlines
Nov 4
STL11:45 amLambert-St Louis
14h 25m
1 stop
LIS8:10 amLisbon Humberto Delgado
Nov 10
LIS11:20 amLisbon Humberto Delgado
35h 20m
2 stops
STL4:40 pmLambert-St Louis
$780
United Airlines
Dec 6
STL6:30 amLambert-St Louis
19h 40m
1 stop
LIS8:10 amLisbon Humberto Delgado
Dec 10
LIS1:00 pmLisbon Humberto Delgado
29h 20m
2 stops
STL12:20 pmLambert-St Louis
$784

Air Canada flights from Illinois to Portugal

Our best Air Canada deals on Illinois to Portugal flight tickets
Air Canada
Nov 16
STL9:23 amLambert-St Louis
18h 27m
2 stops
LIS9:50 amLisbon Humberto Delgado
Nov 18
LIS11:20 amLisbon Humberto Delgado
32h 58m
2 stops
STL2:18 pmLambert-St Louis
$783
Air Canada
Oct 19
STL12:10 pmLambert-St Louis
15h 10m
1 stop
LIS9:20 amLisbon Humberto Delgado
Oct 28
LIS11:20 amLisbon Humberto Delgado
33h 18m
2 stops
STL3:38 pmLambert-St Louis
$851
Air Canada
Oct 19
STL12:10 pmLambert-St Louis
15h 10m
1 stop
LIS9:20 amLisbon Humberto Delgado
Oct 28
LIS11:20 amLisbon Humberto Delgado
33h 18m
2 stops
STL3:38 pmLambert-St Louis
$852

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Portugal 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 June 12, 2026.
Use the filters below to find and compare flights from Illinois to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/2

7:15 pm-11:05 am

1 stop33h 50m

Porto

Wed 11/11

11:55 am-4:45 pm

1 stop34h 50m

$607

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 10/31

8:15 pm-11:05 am

1 stop33h 50m

Porto

Wed 11/11

11:55 am-4:45 pm

1 stop34h 50m

$660

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/9

7:15 pm-11:05 am

1 stop33h 50m

Porto

Mon 11/16

11:55 am-4:45 pm

1 stop34h 50m

$667

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/1

8:10 pm-1:30 pm

1 stop11h 20m

Porto

Sat 11/14

6:00 pm-3:30 pm

1 stop27h 30m

$711
Quickest round-trip

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/1

8:10 pm-6:00 pm

1 stop15h 50m

Porto

Sun 11/8

7:00 am-3:30 pm

1 stop14h 30m

$713

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Wed 11/4

2:00 pm-8:10 am

1 stop12h 10m

Lisbon Humberto Delgado

Tue 11/10

11:20 am-4:40 pm

2 stops35h 20m

$779

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Wed 11/4

11:45 am-8:10 am

1 stop14h 25m

Lisbon Humberto Delgado

Tue 11/10

11:20 am-4:40 pm

2 stops35h 20m

$780

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Mon 11/16

9:23 am-9:50 am

2 stops18h 27m

Lisbon Humberto Delgado

Wed 11/18

11:20 am-2:18 pm

2 stops32h 58m

$783

St. LouisLisbon

STL - LIS

STLLIS

Lambert-St Louis

Sat 11/14

5:20 pm-8:10 am

1 stop32h 50m

Lisbon Humberto Delgado

Tue 11/24

11:20 am-12:20 pm

2 stops31h 00m

$786

ChicagoFaro

ORD - FAO

ORDFAO

Chicago O'Hare Intl

Tue 9/22

11:45 am-11:30 pm

2 stops29h 45m

Faro

Mon 9/28

6:35 am-2:25 pm

1 stop13h 50m

$816

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 Portugal from

How to get the cheapest flight ticket from Illinois to Portugal

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 Portugal?

The cheapest month to fly to Portugal from Illinois is in February. Flight prices, which tend to average around $360, 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 Portugal from Illinois during January instead. Flights to Portugal in January, while not as cheap as those in February, still average around $370.

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

According to our data, Wednesday is the cheapest day to fly to Portugal from Illinois. The lowest ticket price found for a Wednesday departure recently was $606. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Thursday, with ticket prices averaging around $803.

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

Our most recent data shows that the best time of day to fly to Portugal is in the evening. Flights from Illinois to Portugal during this time can be as low as $586. In the afternoon is when there is more demand to fly to Portugal, so prices are often more expensive at around $768 per ticket.

What is the cheapest Illinois to Portugal flight route?

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

How far in advance should I book a flight from Illinois to Portugal?

You are more likely to see cheaper flights to Portugal from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $802 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from Illinois for as low as $681 on momondo.

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

There are 3 cabin classes available to choose from on Illinois to Portugal 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 Illinois to Portugal flights?

You could potentially save up to 41% on your flight if you consider stops on a Illinois to Portugal flight.

Cheap Illinois to Portugal flight deals and tips

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

Best Price Found

$499

Fastest flight time

8h 05m

Direct flights

Mon, Thu, Fri, Sat and Sun

Airports in Portugal

99 airports
The best one-way flight to Portugal from Illinois in the past 72 hours is $499. The best round-trip flight deal from Illinois to Portugal found on momondo in the last 72 hours is $732.
The fastest flight from Illinois to Portugal takes 8h 05m
Direct flights go from Illinois to Portugal on Monday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There are 99 airports in Portugal. From Illinois there are direct flights to Lisbon Humberto Delgado (LIS).
Search flight deals

Frequently asked questions about flying from Illinois to Portugal

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

    Prices for flights from Illinois to Portugal are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Portugal.

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

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

Best airlines flying from Illinois to Portugal

Compare and see reviews for airlines that fly from Illinois to Portugal with momondo
Airline
Rating
Free Cancellation
Price
Scandinavian AirlinesPriceFrom $369Free CancellationRating
7.4
1,818 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $371Free CancellationRating
7.0
673 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom $450Free CancellationRating
7.2
2,274 reviews
Search TAP AIR PORTUGAL flights
Air FrancePriceFrom $470Free CancellationRating
7.5
1,603 reviews
Search Air France flights
LufthansaPriceFrom $483Free CancellationRating
6.8
8,058 reviews
Search Lufthansa flights
SWISSPriceFrom $489Free CancellationRating
7.5
1,969 reviews
Search SWISS flights
DeltaPriceFrom $494Free CancellationRating
7.9
8,398 reviews
Search Delta flights
IberiaPriceFrom $496Free CancellationRating
7.0
3,234 reviews
Search Iberia flights
Aer LingusPriceFrom $497Free CancellationRating
7.3
1,603 reviews
Search Aer Lingus flights
United AirlinesPriceFrom $497Free CancellationRating
7.4
9,809 reviews
Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Portugal for you.

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

Flights from Illinois to Portugal with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential Illinois to Portugal flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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

An easier way to manage your Portugal trip

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