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Cheap flights from Illinois to Porto from $232

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 Porto departing on 10/23. 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 Illinois to Porto

Cheap round-trip flights

Lufthansa Logo
4:20 pm - 11:40 amORD-OPO
13h 20m1 stop
Lufthansa Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$451Lufthansa
Find Deal
Tue, Nov 11 - Tue, Nov 18
Lufthansa Logo
5:20 pm - 11:40 amORD-OPO
13h 20m1 stop
Lufthansa Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$455Lufthansa
Find Deal
Mon, Oct 27 - Wed, Nov 12
United Airlines Logo
6:20 pm - 9:30 amORD-OPO
10h 10m1 stop
United Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$456United Airlines
Find Deal
Mon, Oct 27 - Wed, Nov 12
Multiple Airlines Logo
9:25 pm - 11:00 pmORD-OPO
20h 35m2 stops
Multiple Airlines Logo
5:35 pm - 3:00 pmOPO-ORD
27h 25m2 stops
$466Multiple Airlines
Find Deal
Sun, Oct 26 - Tue, Nov 4
TAP AIR PORTUGAL Logo
8:25 pm - 1:00 pmORD-OPO
10h 35m1 stop
TAP AIR PORTUGAL Logo
8:55 am - 2:45 pmOPO-ORD
11h 50m1 stop
$477TAP AIR PORTUGAL
Find Deal
Sun, Nov 9 - Sun, Nov 16
Multiple Airlines Logo
7:10 pm - 7:20 pmORD-OPO
18h 10m2 stops
Multiple Airlines Logo
11:35 am - 3:15 pmOPO-ORD
33h 40m2 stops
$479Multiple Airlines
Find Deal
Wed, Nov 12 - Thu, Nov 20
United Airlines Logo
7:10 am - 9:45 amORD-OPO
20h 35m1 stop
United Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$482United Airlines
Find Deal
Sun, Oct 19 - Tue, Nov 4
Air Canada Logo
12:50 pm - 12:50 pmORD-OPO
18h 00m2 stops
Air Canada Logo
6:00 am - 7:30 pmOPO-ORD
19h 30m2 stops
$485Air Canada
Find Deal
Mon, Nov 17 - Tue, Nov 25
TAP AIR PORTUGAL Logo
8:15 pm - 6:00 pmORD-OPO
15h 45m1 stop
TAP AIR PORTUGAL Logo
9:00 am - 3:15 pmOPO-ORD
12h 15m1 stop
$489TAP AIR PORTUGAL
Find Deal
Fri, Nov 7 - Fri, Nov 14
Air Canada Logo
12:50 pm - 3:25 pmORD-OPO
20h 35m2 stops
Air Canada Logo
6:00 am - 7:30 pmOPO-ORD
19h 30m2 stops
$514Air Canada
Find Deal
Wed, Nov 19 - Wed, Nov 26

SWISS flights from Illinois to Porto

Our best SWISS deals on Illinois to Porto flight tickets
SWISS
Oct 29
ORD7:50 pmChicago O'Hare Intl
17h 45m
1 stop
OPO6:35 pmPorto
Nov 9
OPO6:35 pmPorto
51h 45m
2 stops
ORD4:20 pmChicago O'Hare Intl
$501
Find similar
SWISS
Nov 9
ORD6:50 pmChicago O'Hare Intl
34h 25m
1 stop
OPO11:15 amPorto
Nov 16
OPO6:35 pmPorto
51h 45m
2 stops
ORD4:20 pmChicago O'Hare Intl
$502
Find similar

TAP AIR PORTUGAL flights from Illinois to Porto

Our best TAP AIR PORTUGAL deals on Illinois to Porto flight tickets
TAP AIR PORTUGAL
Nov 9
ORD8:25 pmChicago O'Hare Intl
10h 35m
1 stop
OPO1:00 pmPorto
Nov 16
OPO8:55 amPorto
11h 50m
1 stop
ORD2:45 pmChicago O'Hare Intl
$477
Find similar
TAP AIR PORTUGAL
Nov 7
ORD8:15 pmChicago O'Hare Intl
15h 45m
1 stop
OPO6:00 pmPorto
Nov 14
OPO9:00 amPorto
12h 15m
1 stop
ORD3:15 pmChicago O'Hare Intl
$489
Find similar
TAP AIR PORTUGAL
Oct 29
ORD8:10 pmChicago O'Hare Intl
11h 55m
1 stop
OPO1:05 pmPorto
Nov 9
OPO5:00 amPorto
15h 45m
1 stop
ORD2:45 pmChicago O'Hare Intl
$490
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Porto 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 September 25, 2025.
Use the filters below to find and compare flights from Illinois to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 11/11

4:20 pm-11:40 am

1 stop13h 20m

Porto

Tue 11/18

6:00 am-1:10 pm

1 stop13h 10m

$451

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

5:20 pm-11:40 am

1 stop13h 20m

Porto

Wed 11/12

6:00 am-1:10 pm

1 stop13h 10m

$455

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 10/27

6:20 pm-9:30 am

1 stop10h 10m

Porto

Wed 11/12

6:00 am-1:10 pm

1 stop13h 10m

$456

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 10/26

9:25 pm-11:00 pm

2 stops20h 35m

Porto

Tue 11/4

5:35 pm-3:00 pm

2 stops27h 25m

$466

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 11/9

8:25 pm-1:00 pm

1 stop10h 35m

Porto

Sun 11/16

8:55 am-2:45 pm

1 stop11h 50m

$477

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/12

7:10 pm-7:20 pm

2 stops18h 10m

Porto

Thu 11/20

11:35 am-3:15 pm

2 stops33h 40m

$479

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 10/19

7:10 am-9:45 am

1 stop20h 35m

Porto

Tue 11/4

6:00 am-1:10 pm

1 stop13h 10m

$482

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 11/17

12:50 pm-12:50 pm

2 stops18h 00m

Porto

Tue 11/25

6:00 am-7:30 pm

2 stops19h 30m

$485

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 11/7

8:15 pm-6:00 pm

1 stop15h 45m

Porto

Fri 11/14

9:00 am-3:15 pm

1 stop12h 15m

$489

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/19

12:50 pm-3:25 pm

2 stops20h 35m

Porto

Wed 11/26

6:00 am-7:30 pm

2 stops19h 30m

$514

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 Porto from

How to get the cheapest flight ticket from Illinois to Porto

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 Porto?

The month of January is, on average, the cheapest month to fly to Porto from Illinois, with most prices found around $585. If you aren’t able to travel during the month of January, then book flights to Porto from Illinois during April instead. Flights to Porto in April, while not as cheap as those in January, still average around $616.

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

The cheapest day to depart on your flight to Porto is on a Monday when prices can be found for as low as $708. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $808. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

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

In the evening is the cheapest time of day to fly from Illinois to Porto when you can find flight prices for as low as $611. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,018 on average. Flights to Porto from Illinois at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Porto from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $679 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Illinois for as low as $626 on momondo.

Cheap Illinois to Porto flight deals and tips

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

Direct flights

None
There are no direct flights from Illinois to Porto. There are no popular flight routes from Illinois to Porto.
Search flight deals

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

    Prices for flights from Illinois to Porto Airport refresh daily.

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

  • How old do you have to be to fly from Illinois to Porto 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 Illinois to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents required for your trip to Porto 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 Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Illinois to Porto

Compare and see reviews for airlines that fly from Illinois to Porto with momondo
Airline
Rating
Free Cancellation
Price
TAP AIR PORTUGALPriceFrom $453Free CancellationRating
7.1
1,990 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $483Free CancellationRating
7.0
2,952 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,399 reviews
Search British Airways flights
KLMPriceFrom $525Free CancellationRating
7.8
1,391 reviews
Search KLM flights
United AirlinesPriceFrom $544Free CancellationRating
7.4
8,928 reviews
Search United Airlines flights
LufthansaPriceFrom $553Free CancellationRating
6.8
7,424 reviews
Search Lufthansa flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,744 reviews
Search SWISS flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
DeltaPriceFrom $701Free CancellationRating
7.9
7,973 reviews
Search Delta flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Esposende
Lamego
Guimarães
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
Mira

Why use momondo?

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

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 Porto for you.

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

Yes. momondo enables you to select and highlight flights to Porto from Illinois with this policy.

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

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 Porto from Illinois.

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

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

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