Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Illinois to Porto from $357

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 9/28. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Illinois to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Turkish Airlines Logo
8:10 pm - 11:30 pm
ORD
-
OPO
21h 20m
1 stop
Turkish Airlines Logo
10:40 am - 9:40 am
OPO
-
ORD
29h 00m
1 stop
$703Turkish Airlines
Thu, Sep 17 - Fri, Oct 9
Turkish Airlines Logo
11:25 am - 3:45 pm
ORD
-
OPO
22h 20m
1 stop
Turkish Airlines Logo
4:40 pm - 9:40 am
OPO
-
ORD
23h 00m
1 stop
$704Turkish Airlines
Thu, Sep 3 - Wed, Sep 16
Turkish Airlines Logo
8:10 pm - 3:45 pm
ORD
-
OPO
37h 35m
1 stop
Turkish Airlines Logo
4:40 pm - 9:40 am
OPO
-
ORD
23h 00m
1 stop
$707Turkish Airlines
Wed, Sep 2 - Wed, Sep 9
Turkish Airlines Logo
11:25 am - 3:45 pm
ORD
-
OPO
22h 20m
1 stop
Turkish Airlines Logo
4:40 pm - 9:40 am
OPO
-
ORD
23h 00m
1 stop
$728Turkish Airlines
Thu, Sep 3 - Wed, Sep 16
United Airlines Logo
7:30 am - 9:45 am
STL
-
OPO
20h 15m
1 stop
United Airlines Logo
12:45 pm - 4:26 pm
OPO
-
STL
33h 41m
2 stops
$829United Airlines
Sun, Oct 4 - Wed, Oct 21
United Airlines Logo
7:30 am - 7:00 am
STL
-
OPO
17h 30m
2 stops
United Airlines Logo
12:15 pm - 2:18 pm
OPO
-
STL
32h 03m
2 stops
$832United Airlines
Tue, Oct 6 - Tue, Oct 20
Delta Logo
4:13 pm - 10:25 am
STL
-
OPO
12h 12m
1 stop
Delta Logo
5:00 am - 5:06 pm
OPO
-
STL
18h 06m
2 stops
$841Delta
Sun, Oct 4 - Wed, Oct 21
Delta Logo
9:00 am - 10:25 am
STL
-
OPO
19h 25m
2 stops
Delta Logo
5:00 am - 5:06 pm
OPO
-
STL
18h 06m
2 stops
$846Delta
Sun, Oct 4 - Wed, Oct 21
Lufthansa Logo
6:49 pm - 11:25 pm
STL
-
OPO
22h 36m
2 stops
Lufthansa Logo
6:00 am - 3:38 pm
OPO
-
STL
39h 38m
2 stops
$854Lufthansa
Mon, Oct 5 - Fri, Oct 16
Multiple Airlines Logo
10:15 am - 6:45 am
MDW
-
OPO
14h 30m
2 stops
Multiple Airlines Logo
8:25 am - 9:40 am
OPO
-
MDW
31h 15m
2 stops
$996Multiple Airlines
Tue, Jun 16 - Tue, Jun 30

United Airlines flights from Illinois to Porto

Our best United Airlines deals on Illinois to Porto flight tickets
United Airlines
Oct 4
STL7:30 amLambert-St Louis
20h 15m
1 stop
OPO9:45 amPorto
Oct 21
OPO12:45 pmPorto
33h 41m
2 stops
STL4:26 pmLambert-St Louis
$829
United Airlines
Oct 18
ORD7:30 amChicago O'Hare Intl
20h 15m
2 stops
OPO9:45 amPorto
Oct 28
OPO6:00 amPorto
20h 05m
1 stop
ORD9:05 pmChicago O'Hare Intl
$832
United Airlines
Oct 5
STL9:23 amLambert-St Louis
18h 22m
2 stops
OPO9:45 amPorto
Oct 20
OPO12:15 pmPorto
32h 03m
2 stops
STL2:18 pmLambert-St Louis
$833

Turkish Airlines flights from Illinois to Porto

Our best Turkish Airlines deals on Illinois to Porto flight tickets
Turkish Airlines
Sep 17
ORD8:10 pmChicago O'Hare Intl
21h 20m
1 stop
OPO11:30 pmPorto
Oct 9
OPO10:40 amPorto
29h 00m
1 stop
ORD9:40 amChicago O'Hare Intl
$703
Turkish Airlines
Sep 3
ORD11:25 amChicago O'Hare Intl
22h 20m
1 stop
OPO3:45 pmPorto
Sep 16
OPO4:40 pmPorto
23h 00m
1 stop
ORD9:40 amChicago O'Hare Intl
$704
Turkish Airlines
Sep 2
ORD8:10 pmChicago O'Hare Intl
37h 35m
1 stop
OPO3:45 pmPorto
Sep 9
OPO4:40 pmPorto
23h 00m
1 stop
ORD9:40 amChicago O'Hare Intl
$707

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 April 30, 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 9/17

8:10 pm-11:30 pm

1 stop21h 20m

Porto

Fri 10/9

10:40 am-9:40 am

1 stop29h 00m

$703

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 9/3

11:25 am-3:45 pm

1 stop22h 20m

Porto

Wed 9/16

4:40 pm-9:40 am

1 stop23h 00m

$704

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 9/2

8:10 pm-3:45 pm

1 stop37h 35m

Porto

Wed 9/9

4:40 pm-9:40 am

1 stop23h 00m

$707

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Thu 9/3

11:25 am-3:45 pm

1 stop22h 20m

Porto

Wed 9/16

4:40 pm-9:40 am

1 stop23h 00m

$728

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 10/4

7:30 am-9:45 am

1 stop20h 15m

Porto

Wed 10/21

12:45 pm-4:26 pm

2 stops33h 41m

$829

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/6

7:30 am-7:00 am

2 stops17h 30m

Porto

Tue 10/20

12:15 pm-2:18 pm

2 stops32h 03m

$832
Quickest round-trip

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 10/4

4:13 pm-10:25 am

1 stop12h 12m

Porto

Wed 10/21

5:00 am-5:06 pm

2 stops18h 06m

$841

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 10/4

9:00 am-10:25 am

2 stops19h 25m

Porto

Wed 10/21

5:00 am-5:06 pm

2 stops18h 06m

$846

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 10/5

6:49 pm-11:25 pm

2 stops22h 36m

Porto

Fri 10/16

6:00 am-3:38 pm

2 stops39h 38m

$854

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 6/16

10:15 am-6:45 am

2 stops14h 30m

Porto

Tue 6/30

8:25 am-9:40 am

2 stops31h 15m

$996

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $709 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 $520 on momondo.

Can stopping save me money on Illinois to Porto flights?

You could potentially save up to 21% 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

11h 52m

Direct flights

None
The fastest flight from Illinois to Porto takes 11h 52m
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
2,225 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $474Free CancellationRating
6.8
7,962 reviews
Search Lufthansa flights
IberiaPriceFrom $519Free CancellationRating
7.0
3,204 reviews
Search Iberia flights
American AirlinesPriceFrom $524Free CancellationRating
7.1
11,681 reviews
Search American Airlines flights
KLMPriceFrom $531Free CancellationRating
7.8
1,512 reviews
Search KLM flights
United AirlinesPriceFrom $541Free CancellationRating
7.4
9,677 reviews
Search United 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
Lamego
Esposende
Chaves
Pinhao
Guimarães
Espinho
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.

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 5/30
Sat 6/6
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal