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Cheap flights from Illinois to Porto from $326

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 9/13. 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 Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
7:50 pm - 11:00 pm
ORD
-
OPO
21h 10m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 12:40 pm
OPO
-
ORD
20h 10m
1 stop
$620TAP AIR PORTUGAL
Thu, Aug 13 - Wed, Aug 26
TAP AIR PORTUGAL Logo
6:05 pm - 12:40 am
ORD
-
OPO
24h 35m
1 stop
TAP AIR PORTUGAL Logo
10:00 am - 4:00 pm
OPO
-
ORD
12h 00m
1 stop
$624TAP AIR PORTUGAL
Sat, Oct 10 - Wed, Oct 21
Multiple Airlines Logo
6:00 pm - 11:50 pm
ORD
-
OPO
23h 50m
2 stops
Multiple Airlines Logo
7:10 am - 12:40 pm
OPO
-
ORD
35h 30m
2 stops
$642Multiple Airlines
Wed, Sep 23 - Wed, Sep 30
Multiple Airlines Logo
6:00 pm - 11:50 pm
ORD
-
OPO
23h 50m
2 stops
Multiple Airlines Logo
7:10 am - 12:40 pm
OPO
-
ORD
35h 30m
2 stops
$643Multiple Airlines
Wed, Sep 23 - Wed, Sep 30
Iberia Logo
11:50 am - 11:45 am
STL
-
OPO
17h 55m
2 stops
Iberia Logo
4:40 pm - 10:37 am
OPO
-
STL
23h 57m
2 stops
$741Iberia
Mon, Dec 7 - Wed, Dec 9
United Airlines Logo
5:20 pm - 9:30 am
STL
-
OPO
10h 10m
1 stop
United Airlines Logo
6:00 am - 11:09 pm
OPO
-
STL
23h 09m
2 stops
$750United Airlines
Mon, Dec 7 - Thu, Dec 10
Turkish Airlines Logo
8:10 pm - 3:40 pm
ORD
-
OPO
37h 30m
1 stop
Turkish Airlines Logo
4:40 pm - 6:15 pm
OPO
-
ORD
31h 35m
1 stop
$752Turkish Airlines
Tue, Oct 6 - Thu, Oct 22
Turkish Airlines Logo
8:10 pm - 3:40 pm
ORD
-
OPO
37h 30m
1 stop
Turkish Airlines Logo
4:40 pm - 9:40 am
OPO
-
ORD
23h 00m
1 stop
$752Turkish Airlines
Mon, Sep 28 - Thu, Oct 8
United Airlines Logo
6:15 am - 9:30 am
STL
-
OPO
21h 15m
2 stops
United Airlines Logo
6:00 am - 11:09 pm
OPO
-
STL
23h 09m
2 stops
$754United Airlines
Mon, Dec 7 - Thu, Dec 10
Iberia Logo
9:50 am - 7:40 am
STL
-
OPO
15h 50m
2 stops
Iberia Logo
12:25 pm - 9:30 am
OPO
-
STL
27h 05m
2 stops
$763Iberia
Wed, Nov 4 - Mon, Nov 9

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Iberia flights from Illinois to Porto

Our best Iberia deals on Illinois to Porto flight tickets
Iberia
Nov 4
STL9:50 amLambert-St Louis
15h 50m
2 stops
OPO7:40 amPorto
Nov 9
OPO12:25 pmPorto
27h 05m
2 stops
STL9:30 amLambert-St Louis
$763
Iberia
Sep 7
STL9:32 amLambert-St Louis
24h 28m
2 stops
OPO4:00 pmPorto
Sep 14
OPO8:40 pmPorto
30h 04m
2 stops
STL8:44 pmLambert-St Louis
$965
Iberia
Jul 28
ORD4:55 pmChicago O'Hare Intl
21h 05m
1 stop
OPO8:00 pmPorto
Aug 18
OPO8:40 pmPorto
22h 40m
2 stops
ORD1:20 pmChicago O'Hare Intl
$1,085

Air Canada flights from Illinois to Porto

Our best Air Canada deals on Illinois to Porto flight tickets
Air Canada
Oct 15
STL2:40 pmLambert-St Louis
34h 30m
2 stops
OPO7:10 amPorto
Oct 20
OPO11:15 amPorto
13h 26m
1 stop
STL6:41 pmLambert-St Louis
$891
Air Canada
Sep 9
STL12:10 pmLambert-St Louis
12h 50m
1 stop
OPO7:00 amPorto
Sep 16
OPO11:20 amPorto
13h 21m
1 stop
STL6:41 pmLambert-St Louis
$943
Air Canada
Sep 5
STL5:30 pmLambert-St Louis
55h 30m
2 stops
OPO7:00 amPorto
Sep 13
OPO12:15 pmPorto
12h 26m
1 stop
STL6:41 pmLambert-St Louis
$1,019

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 July 28, 2026.
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

Cheapest round-trip

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 8/13

7:50 pm-11:00 pm

1 stop21h 10m

Porto

Wed 8/26

10:30 pm-12:40 pm

1 stop20h 10m

$620

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sat 10/10

6:05 pm-12:40 am

1 stop24h 35m

Porto

Wed 10/21

10:00 am-4:00 pm

1 stop12h 00m

$624

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/23

6:00 pm-11:50 pm

2 stops23h 50m

Porto

Wed 9/30

7:10 am-12:40 pm

2 stops35h 30m

$642

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/23

6:00 pm-11:50 pm

2 stops23h 50m

Porto

Wed 9/30

7:10 am-12:40 pm

2 stops35h 30m

$643

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 12/7

11:50 am-11:45 am

2 stops17h 55m

Porto

Wed 12/9

4:40 pm-10:37 am

2 stops23h 57m

$741
Quickest round-trip

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 12/7

5:20 pm-9:30 am

1 stop10h 10m

Porto

Thu 12/10

6:00 am-11:09 pm

2 stops23h 09m

$750

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 10/6

8:10 pm-3:40 pm

1 stop37h 30m

Porto

Thu 10/22

4:40 pm-6:15 pm

1 stop31h 35m

$752

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Mon 9/28

8:10 pm-3:40 pm

1 stop37h 30m

Porto

Thu 10/8

4:40 pm-9:40 am

1 stop23h 00m

$752

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 12/7

6:15 am-9:30 am

2 stops21h 15m

Porto

Thu 12/10

6:00 am-11:09 pm

2 stops23h 09m

$754

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 11/4

9:50 am-7:40 am

2 stops15h 50m

Porto

Mon 11/9

12:25 pm-9:30 am

2 stops27h 05m

$763

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 $558. 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 $610.

How far in advance should I book a flight from Illinois 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 $809 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 $621 on momondo.

Can stopping save me money on Illinois to Porto flights?

You could potentially save up to 45% on your flight if you consider stops on a Illinois to Porto flight.

Cheap Illinois to Porto flight deals and tips

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

Fastest flight time

10h 45m

Direct flights

None
The fastest flight from Illinois to Porto takes 10h 45m
There are no direct flights from Illinois to Porto. There are no popular flight routes from Illinois to Porto.
Search flight deals

Frequently asked questions about flying from Illinois to Porto

  • 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 $451Free CancellationRating
7.2
2,349 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $474Free CancellationRating
6.8
8,161 reviews
Search Lufthansa flights
United AirlinesPriceFrom $489Free CancellationRating
7.4
10,045 reviews
Search United Airlines flights
IberiaPriceFrom $519Free CancellationRating
7.0
3,258 reviews
Search Iberia flights
American AirlinesPriceFrom $524Free CancellationRating
7.1
11,837 reviews
Search American Airlines flights
KLMPriceFrom $531Free CancellationRating
7.8
1,550 reviews
Search KLM flights
Turkish AirlinesPriceFrom $618Free CancellationRating
7.4
4,452 reviews
Search Turkish Airlines flights

Traveling to a place near Porto?

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