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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 3/9. 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

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
6:00 pm - 5:00 pm
ORD
-
OPO
17h 00m
1 stop
TAP AIR PORTUGAL Logo
9:00 am - 4:00 pm
OPO
-
ORD
13h 00m
1 stop
$371TAP AIR PORTUGAL
Wed, Apr 15 - Wed, Apr 22
American Airlines Logo
6:52 am - 7:40 am
STL
-
OPO
18h 48m
2 stops
American Airlines Logo
8:20 am - 11:48 pm
OPO
-
STL
21h 28m
2 stops
$461American Airlines
Sun, Feb 1 - Thu, Feb 12
Scandinavian Airlines Logo
8:20 pm - 4:55 pm
ORD
-
OPO
15h 35m
1 stop
Scandinavian Airlines Logo
10:25 am - 5:45 pm
OPO
-
ORD
36h 20m
1 stop
$463Scandinavian Airlines
Thu, Mar 19 - Wed, Mar 25
Lufthansa Logo
9:50 pm - 11:40 pm
ORD
-
OPO
19h 50m
1 stop
Lufthansa Logo
12:30 pm - 9:05 pm
OPO
-
ORD
13h 35m
1 stop
$468Lufthansa
Wed, Mar 4 - Wed, Mar 11
TAP AIR PORTUGAL Logo
7:10 pm - 3:05 pm
ORD
-
OPO
13h 55m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:00 pm
OPO
-
ORD
14h 05m
1 stop
$471TAP AIR PORTUGAL
Wed, Feb 4 - Wed, Feb 11
Scandinavian Airlines Logo
8:20 pm - 4:55 pm
ORD
-
OPO
15h 35m
1 stop
Scandinavian Airlines Logo
10:25 am - 5:45 pm
OPO
-
ORD
36h 20m
1 stop
$473Scandinavian Airlines
Thu, Mar 19 - Wed, Mar 25
SWISS Logo
2:20 pm - 6:30 pm
ORD
-
OPO
22h 10m
1 stop
SWISS Logo
7:20 pm - 3:55 pm
OPO
-
ORD
26h 35m
1 stop
$477SWISS
Wed, Apr 15 - Thu, Apr 30
Air Canada Logo
4:05 pm - 11:15 am
STL
-
OPO
38h 10m
2 stops
Air Canada Logo
6:20 am - 3:24 pm
OPO
-
STL
39h 04m
2 stops
$490Air Canada
Tue, Mar 24 - Thu, Apr 2
Lufthansa Logo
9:40 pm - 11:25 pm
ORD
-
OPO
19h 45m
1 stop
Lufthansa Logo
6:00 am - 12:55 pm
OPO
-
ORD
12h 55m
1 stop
$500Lufthansa
Wed, Apr 15 - Thu, Apr 30
SWISS Logo
2:20 pm - 11:25 am
ORD
-
OPO
15h 05m
1 stop
SWISS Logo
8:40 am - 3:55 pm
OPO
-
ORD
13h 15m
1 stop
$506SWISS
Tue, Apr 28 - Tue, May 5

Lufthansa flights from Illinois to Porto

Our best Lufthansa deals on Illinois to Porto flight tickets
Lufthansa
Mar 4
ORD9:50 pmChicago O'Hare Intl
19h 50m
1 stop
OPO11:40 pmPorto
Mar 11
OPO12:30 pmPorto
13h 35m
1 stop
ORD9:05 pmChicago O'Hare Intl
$468
Lufthansa
Apr 15
ORD9:40 pmChicago O'Hare Intl
19h 45m
1 stop
OPO11:25 pmPorto
Apr 30
OPO6:00 amPorto
12h 55m
1 stop
ORD12:55 pmChicago O'Hare Intl
$500
Lufthansa
Mar 23
STL7:00 pmLambert-St Louis
22h 25m
2 stops
OPO10:25 pmPorto
Apr 1
OPO12:00 pmPorto
16h 56m
2 stops
STL10:56 pmLambert-St Louis
$506

TAP AIR PORTUGAL flights from Illinois to Porto

Our best TAP AIR PORTUGAL deals on Illinois to Porto flight tickets
TAP AIR PORTUGAL
Apr 15
ORD6:00 pmChicago O'Hare Intl
17h 00m
1 stop
OPO5:00 pmPorto
Apr 22
OPO9:00 amPorto
13h 00m
1 stop
ORD4:00 pmChicago O'Hare Intl
$371
TAP AIR PORTUGAL
Jan 25
ORD8:25 pmChicago O'Hare Intl
15h 40m
1 stop
OPO6:05 pmPorto
Feb 7
OPO6:00 pmPorto
26h 45m
1 stop
ORD2:45 pmChicago O'Hare Intl
$373
TAP AIR PORTUGAL
Jan 25
ORD8:25 pmChicago O'Hare Intl
15h 40m
1 stop
OPO6:05 pmPorto
Feb 10
OPO8:00 pmPorto
25h 00m
1 stop
ORD3:00 pmChicago O'Hare Intl
$469

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 January 22, 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

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/15

6:00 pm-5:00 pm

1 stop17h 00m

Porto

Wed 4/22

9:00 am-4:00 pm

1 stop13h 00m

$371

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 2/1

6:52 am-7:40 am

2 stops18h 48m

Porto

Thu 2/12

8:20 am-11:48 pm

2 stops21h 28m

$461

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 3/19

8:20 pm-4:55 pm

1 stop15h 35m

Porto

Wed 3/25

10:25 am-5:45 pm

1 stop36h 20m

$463

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 3/4

9:50 pm-11:40 pm

1 stop19h 50m

Porto

Wed 3/11

12:30 pm-9:05 pm

1 stop13h 35m

$468

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 2/4

7:10 pm-3:05 pm

1 stop13h 55m

Porto

Wed 2/11

6:55 am-3:00 pm

1 stop14h 05m

$471

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 3/19

8:20 pm-4:55 pm

1 stop15h 35m

Porto

Wed 3/25

10:25 am-5:45 pm

1 stop36h 20m

$473

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/15

2:20 pm-6:30 pm

1 stop22h 10m

Porto

Thu 4/30

7:20 pm-3:55 pm

1 stop26h 35m

$477

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 3/24

4:05 pm-11:15 am

2 stops38h 10m

Porto

Thu 4/2

6:20 am-3:24 pm

2 stops39h 04m

$490

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 4/15

9:40 pm-11:25 pm

1 stop19h 45m

Porto

Thu 4/30

6:00 am-12:55 pm

1 stop12h 55m

$500

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 4/28

2:20 pm-11:25 am

1 stop15h 05m

Porto

Tue 5/5

8:40 am-3:55 pm

1 stop13h 15m

$506

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 April is, on average, the cheapest month to fly to Porto from Illinois, with most prices found around $616. If you aren’t able to travel during the month of April, then book flights to Porto from Illinois during March instead. Flights to Porto in March, while not as cheap as those in April, still average around $650.

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 $672 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 $613 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

Fastest flight time

11h 00m

Direct flights

None
The fastest flight from Illinois to Porto takes 11h 00m
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 $480Free CancellationRating
7.1
2,126 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $488Free CancellationRating
7.0
3,097 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,690 reviews
Search British Airways flights
LufthansaPriceFrom $507Free CancellationRating
6.8
7,743 reviews
Search Lufthansa flights
KLMPriceFrom $531Free CancellationRating
7.7
1,442 reviews
Search KLM flights
United AirlinesPriceFrom $547Free CancellationRating
7.4
9,192 reviews
Search United Airlines flights
American AirlinesPriceFrom $553Free CancellationRating
7.2
11,177 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,855 reviews
Search SWISS flights
DeltaPriceFrom $638Free CancellationRating
7.9
8,088 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,648 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
Coimbra
Braga
Matosinhos
Aveiro
Esposende
Lamego
Guimarães
Espinho
Chaves
Pinhao
Arcos de Valdevez
Ponte de Lima
Viseu
Curia
Penafiel
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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