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Cheap flights from Illinois to Porto from $312

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 10/19. 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.
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
7:00 pm - 5:00 pm
ORD
-
OPO
16h 00m
1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 3:30 pm
OPO
-
ORD
25h 30m
1 stop
$691TAP AIR PORTUGAL
Wed, Nov 11 - Tue, Nov 17
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
$711TAP AIR PORTUGAL
Sun, Nov 1 - Sun, Nov 8
United Airlines Logo
7:30 am - 9:30 am
STL
-
OPO
20h 00m
1 stop
United Airlines Logo
6:00 am - 11:25 pm
OPO
-
STL
23h 25m
2 stops
$745United Airlines
Sun, Dec 6 - Thu, Dec 10
United Airlines Logo
6:15 am - 9:30 am
STL
-
OPO
21h 15m
2 stops
United Airlines Logo
6:00 am - 12:34 am
OPO
-
STL
24h 34m
2 stops
$750United Airlines
Sun, Dec 6 - Thu, Dec 10
Delta Logo
1:00 pm - 9:05 am
MDW
-
OPO
14h 05m
2 stops
Delta Logo
5:00 am - 10:10 pm
OPO
-
MDW
23h 10m
2 stops
$809Delta
Wed, Nov 11 - Tue, Nov 17
Delta Logo
9:30 am - 10:30 am
MDW
-
OPO
19h 00m
2 stops
Delta Logo
5:00 am - 4:50 pm
OPO
-
MDW
17h 50m
2 stops
$858Delta
Mon, Nov 2 - Wed, Nov 11
Porter Airlines Logo
10:25 am - 6:45 am
MDW
-
OPO
14h 20m
2 stops
Porter Airlines Logo
8:25 am - 9:40 am
OPO
-
MDW
31h 15m
2 stops
$892Porter Airlines
Tue, Jul 14 - Tue, Jul 21

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Scandinavian Airlines flights from Illinois to Porto

Our best Scandinavian Airlines deals on Illinois to Porto flight tickets
Scandinavian Airlines
Nov 2
ORD7:15 pmChicago O'Hare Intl
33h 50m
1 stop
OPO11:05 amPorto
Nov 11
OPO11:55 amPorto
34h 50m
1 stop
ORD4:45 pmChicago O'Hare Intl
$607
Scandinavian Airlines
Nov 9
ORD7:15 pmChicago O'Hare Intl
33h 50m
1 stop
OPO11:05 amPorto
Nov 16
OPO11:55 amPorto
34h 50m
1 stop
ORD4:45 pmChicago O'Hare Intl
$667
Scandinavian Airlines
Nov 2
ORD7:15 pmChicago O'Hare Intl
33h 50m
1 stop
OPO11:05 amPorto
Nov 9
OPO11:55 amPorto
34h 50m
1 stop
ORD4:45 pmChicago O'Hare Intl
$677

Iberia flights from Illinois to Porto

Our best Iberia deals on Illinois to Porto flight tickets
Iberia
Nov 10
ORD5:10 pmChicago O'Hare Intl
16h 50m
2 stops
OPO4:00 pmPorto
Nov 17
OPO8:20 amPorto
12h 35m
1 stop
ORD2:55 pmChicago O'Hare Intl
$770
Iberia
Nov 2
ORD3:08 pmChicago O'Hare Intl
14h 37m
2 stops
OPO11:45 amPorto
Nov 11
OPO8:20 amPorto
12h 35m
1 stop
ORD2:55 pmChicago O'Hare Intl
$772
Iberia
Jun 17
STL8:14 pmLambert-St Louis
53h 26m
2 stops
OPO7:40 amPorto
Jun 24
OPO4:40 pmPorto
37h 19m
2 stops
STL11:59 pmLambert-St Louis
$1,410

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 June 14, 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

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

Wed 11/11

7:00 pm-5:00 pm

1 stop16h 00m

Porto

Tue 11/17

8:00 pm-3:30 pm

1 stop25h 30m

$691
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

$711

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 12/6

7:30 am-9:30 am

1 stop20h 00m

Porto

Thu 12/10

6:00 am-11:25 pm

2 stops23h 25m

$745

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 12/6

6:15 am-9:30 am

2 stops21h 15m

Porto

Thu 12/10

6:00 am-12:34 am

2 stops24h 34m

$750

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 11/11

1:00 pm-9:05 am

2 stops14h 05m

Porto

Tue 11/17

5:00 am-10:10 pm

2 stops23h 10m

$809

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Mon 11/2

9:30 am-10:30 am

2 stops19h 00m

Porto

Wed 11/11

5:00 am-4:50 pm

2 stops17h 50m

$858

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 7/14

10:25 am-6:45 am

2 stops14h 20m

Porto

Tue 7/21

8:25 am-9:40 am

2 stops31h 15m

$892

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 September is, on average, the cheapest month to fly to Porto from Illinois, with most prices found around $355. If you aren’t able to travel during the month of September, then book flights to Porto from Illinois during May instead. Flights to Porto in May, while not as cheap as those in September, still average around $372.

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 $731 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 $540 on momondo.

Can stopping save me money on Illinois to Porto flights?

You could potentially save up to 30% 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

12h 50m

Direct flights

None
The fastest flight from Illinois to Porto takes 12h 50m
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 $450Free CancellationRating
7.2
2,273 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $474Free CancellationRating
6.8
8,060 reviews
Search Lufthansa flights
United AirlinesPriceFrom $497Free CancellationRating
7.4
9,821 reviews
Search United Airlines flights
American AirlinesPriceFrom $524Free CancellationRating
7.1
11,654 reviews
Search American Airlines flights
KLMPriceFrom $531Free CancellationRating
7.8
1,529 reviews
Search KLM flights
IberiaPriceFrom $684Free CancellationRating
7.0
3,234 reviews
Search Iberia 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
Lamego
Esposende
Chaves
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Ponte de Lima
Viseu
Curia
Mesao Frio
Mira
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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