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Cheap flights from Illinois to Porto from $235

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.
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0 bags

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Find the cheapest flights from Illinois to Porto

Cheap round-trip flights

Logo
2:00 pm - 10:00 amORD-OPO
14h 00m2 stops
Logo
7:15 am - 9:51 amOPO-ORD
32h 36m2 stops
$471
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Wed, Oct 15 - Wed, Oct 22
Logo
10:40 am - 3:00 pmORD-OPO
22h 20m2 stops
Logo
8:05 pm - 7:30 pmOPO-ORD
28h 25m3 stops
$474
Find Deal
Tue, Oct 21 - Wed, Oct 29
United Airlines Logo
4:20 pm - 9:30 amORD-OPO
11h 10m1 stop
United Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$484United Airlines
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Wed, Nov 5 - Wed, Nov 12
TAP AIR PORTUGAL Logo
8:15 pm - 10:00 pmORD-OPO
19h 45m1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 3:00 pmOPO-ORD
25h 00m1 stop
$486TAP AIR PORTUGAL
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Fri, Nov 7 - Tue, Nov 11
United Airlines Logo
1:00 pm - 9:30 amORD-OPO
14h 30m2 stops
United Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$489United Airlines
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Wed, Nov 5 - Wed, Nov 12
TAP AIR PORTUGAL Logo
8:10 pm - 7:00 pmORD-OPO
17h 50m1 stop
TAP AIR PORTUGAL Logo
5:00 am - 3:00 pmOPO-ORD
16h 00m1 stop
$493TAP AIR PORTUGAL
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Wed, Oct 29 - Sun, Nov 9
Iberia Logo
8:05 am - 7:40 amORD-OPO
17h 35m2 stops
Iberia Logo
8:20 am - 2:30 pmOPO-ORD
12h 10m1 stop
$503Iberia
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Mon, Jan 12 - Thu, Jan 22
Lufthansa Logo
4:20 pm - 11:40 amORD-OPO
13h 20m1 stop
Lufthansa Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$506Lufthansa
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Sun, Jan 11 - Tue, Jan 20
Iberia Logo
6:45 pm - 7:40 amORD-OPO
30h 55m2 stops
Iberia Logo
4:40 pm - 2:30 pmOPO-ORD
27h 50m1 stop
$512Iberia
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Sun, Jan 11 - Wed, Jan 21
Lufthansa Logo
9:15 pm - 11:40 amORD-OPO
32h 25m2 stops
Lufthansa Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$523Lufthansa
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Sat, Jan 10 - Tue, Jan 20

Delta flights from Illinois to Porto

Our best Delta deals on Illinois to Porto flight tickets
Delta
Oct 13
MDW6:23 pmChicago Midway
17h 32m
2 stops
OPO5:55 pmPorto
Oct 21
OPO6:15 amPorto
18h 10m
2 stops
MDW6:25 pmChicago Midway
$620
Find similar
Delta
Aug 20
MDW6:17 pmChicago Midway
15h 13m
2 stops
OPO3:30 pmPorto
Aug 27
OPO6:15 amPorto
17h 22m
2 stops
MDW5:37 pmChicago Midway
$640
Find similar
Delta
Nov 5
MDW9:20 amChicago Midway
19h 10m
2 stops
OPO10:30 amPorto
Nov 12
OPO6:00 amPorto
21h 44m
2 stops
MDW9:44 pmChicago Midway
$648
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TAP AIR PORTUGAL flights from Illinois to Porto

Our best TAP AIR PORTUGAL deals on Illinois to Porto flight tickets
TAP AIR PORTUGAL
Nov 7
ORD8:15 pmChicago O'Hare Intl
19h 45m
1 stop
OPO10:00 pmPorto
Nov 11
OPO8:00 pmPorto
25h 00m
1 stop
ORD3:00 pmChicago O'Hare Intl
$486
Find similar
TAP AIR PORTUGAL
Oct 29
ORD8:10 pmChicago O'Hare Intl
17h 50m
1 stop
OPO7:00 pmPorto
Nov 9
OPO5:00 amPorto
16h 00m
1 stop
ORD3:00 pmChicago O'Hare Intl
$493
Find similar
TAP AIR PORTUGAL
Jan 7
ORD7:10 pmChicago O'Hare Intl
13h 55m
1 stop
OPO3:05 pmPorto
Feb 6
OPO6:55 amPorto
14h 20m
1 stop
ORD3:15 pmChicago O'Hare Intl
$515
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 August 7, 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

Wed 10/15

2:00 pm-10:00 am

2 stops14h 00m

Porto

Wed 10/22

7:15 am-9:51 am

2 stops32h 36m

$471

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 10/21

10:40 am-3:00 pm

2 stops22h 20m

Porto

Wed 10/29

8:05 pm-7:30 pm

3 stops28h 25m

$474

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/5

4:20 pm-9:30 am

1 stop11h 10m

Porto

Wed 11/12

6:00 am-1:10 pm

1 stop13h 10m

$484

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Fri 11/7

8:15 pm-10:00 pm

1 stop19h 45m

Porto

Tue 11/11

8:00 pm-3:00 pm

1 stop25h 00m

$486

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 11/5

1:00 pm-9:30 am

2 stops14h 30m

Porto

Wed 11/12

6:00 am-1:10 pm

1 stop13h 10m

$489

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 10/29

8:10 pm-7:00 pm

1 stop17h 50m

Porto

Sun 11/9

5:00 am-3:00 pm

1 stop16h 00m

$493

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 1/12

8:05 am-7:40 am

2 stops17h 35m

Porto

Thu 1/22

8:20 am-2:30 pm

1 stop12h 10m

$503

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 1/11

4:20 pm-11:40 am

1 stop13h 20m

Porto

Tue 1/20

6:00 am-1:10 pm

1 stop13h 10m

$506

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 1/11

6:45 pm-7:40 am

2 stops30h 55m

Porto

Wed 1/21

4:40 pm-2:30 pm

1 stop27h 50m

$512

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 1/10

9:15 pm-11:40 am

2 stops32h 25m

Porto

Tue 1/20

6:00 am-1:10 pm

1 stop13h 10m

$523

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 November is, on average, the cheapest month to fly to Porto from Illinois, with most prices found around $557. If you aren’t able to travel during the month of November, then book flights to Porto from Illinois during February instead. Flights to Porto in February, while not as cheap as those in November, still average around $564.

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 $681 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 $619 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

Best Price Found

$235

Fastest flight time

10h 05m

Direct flights

None

Airports in Porto

1 airport
The best one-way flight to Porto from Illinois in the past 72 hours is $235. The best round-trip flight deal from Illinois to Porto found on momondo in the last 72 hours is $471.
The fastest flight from Illinois to Porto takes 10h 05m
There are no direct flights from Illinois to Porto. Popular non-direct routes for this connection are Chicago O'Hare Intl Airport - Porto Airport, Chicago Midway Airport - Porto Airport and Lambert-St Louis Airport - Porto Airport.
There is 1 airport near Porto: Porto (OPO)
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  • 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 $438Free CancellationRating
7.1
1,944 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $473Free CancellationRating
7.0
2,866 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.6
7,245 reviews
Search British Airways flights
LufthansaPriceFrom $535Free CancellationRating
6.8
7,289 reviews
Search Lufthansa flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.6
1,690 reviews
Search SWISS flights
United AirlinesPriceFrom $560Free CancellationRating
7.4
8,917 reviews
Search United Airlines flights
KLMPriceFrom $563Free CancellationRating
7.8
1,381 reviews
Search KLM flights
DeltaPriceFrom $594Free CancellationRating
8.0
7,985 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
9,893 reviews
Search Air Canada 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
Lamego
Guimarães
Esposende
Chaves
Arcos de Valdevez
Espinho
Viseu
Ponte de Lima
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
Pinhao
Baiao

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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