What is the cheapest airline that flies from Illinois to Porto?

KLM, Delta, and Lufthansa are the most popular carriers operating from Illinois to Porto

What airlines fly to Porto?

United Airlines, TAP AIR PORTUGAL and Iberia are the top three most popular airlines that fly to Porto from Illinois according to our data. United Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 10 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.

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?

As of November 2025, there are 10 operators available to choose from 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.

$220 Cheap Flights from Illinois to Porto in 2025/26

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Find the cheapest flights from Illinois to Porto

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:10 pm - 3:05 pmORD-OPO

13h 55m1 stop

5:00 am - 2:45 pmOPO-ORD

15h 45m1 stop

$427TAP AIR PORTUGAL

Find Deal

Wed, Dec 3 - Sun, Dec 14

6:00 pm - 12:50 pmORD-OPO

12h 50m1 stop

6:00 am - 1:10 pmOPO-ORD

13h 10m1 stop

$433Lufthansa

Find Deal

Tue, Jan 13 - Tue, Jan 20

5:55 pm - 12:05 pmORD-OPO

12h 10m1 stop

6:00 am - 1:10 pmOPO-ORD

13h 10m1 stop

$445Multiple Airlines

Find Deal

Sun, Jan 11 - Tue, Jan 27

7:15 am - 12:50 pmORD-OPO

23h 35m2 stops

6:00 am - 1:10 pmOPO-ORD

13h 10m1 stop

$451Multiple Airlines

Find Deal

Sun, Jan 11 - Tue, Jan 27

6:50 pm - 11:10 amORD-OPO

34h 20m1 stop

12:10 pm - 12:45 pmOPO-ORD

30h 35m1 stop

$463SWISS

Find Deal

Wed, Jan 28 - Wed, Feb 4

5:10 pm - 11:15 amORD-OPO

13h 05m1 stop

8:40 am - 3:55 pmOPO-ORD

13h 15m1 stop

$464SWISS

Find Deal

Tue, Mar 17 - Tue, Mar 31

6:00 am - 10:30 amSTL-OPO

22h 30m2 stops

6:05 am - 8:43 pmOPO-STL

20h 38m2 stops

$492Delta

Find Deal

Fri, Feb 6 - Tue, Feb 10

1:28 pm - 10:30 amMDW-OPO

15h 02m2 stops

4:10 pm - 5:37 pmOPO-MDW

31h 27m2 stops

$591KLM

Find Deal

Wed, Feb 4 - Wed, Feb 11

2:00 pm - 10:30 amMDW-OPO

15h 30m2 stops

5:00 am - 6:08 pmOPO-MDW

19h 08m2 stops

$597Delta

Find Deal

Tue, Mar 17 - Tue, Mar 31

1:14 pm - 10:30 amMDW-OPO

15h 16m2 stops

6:30 am - 6:18 pmOPO-MDW

17h 48m2 stops

$1,106KLM

Find Deal

Thu, Dec 4 - Fri, Dec 12

Delta flights from Illinois to Porto

Our best Delta deals on Illinois to Porto flight tickets

Delta

Dec 10

MDW9:59 amChicago Midway

18h 31m

2 stops

OPO10:30 amPorto

Dec 16

OPO6:05 amPorto

23h 42m

2 stops

MDW11:47 pmChicago Midway

$491

Find similar

Delta

Feb 6

STL6:00 amLambert-St Louis

22h 30m

2 stops

OPO10:30 amPorto

Feb 10

OPO6:05 amPorto

20h 38m

2 stops

STL8:43 pmLambert-St Louis

$492

Find similar

Delta

Jan 11

MDW9:32 amChicago Midway

18h 58m

2 stops

OPO10:30 amPorto

Jan 20

OPO6:05 amPorto

22h 17m

2 stops

MDW10:22 pmChicago Midway

$522

Find similar

TAP AIR PORTUGAL flights from Illinois to Porto

Our best TAP AIR PORTUGAL deals on Illinois to Porto flight tickets

TAP AIR PORTUGAL

Nov 28

ORD8:15 pmChicago O'Hare Intl

14h 45m

1 stop

OPO5:00 pmPorto

Dec 11

OPO6:00 pmPorto

27h 25m

1 stop

ORD3:25 pmChicago O'Hare Intl

$420

Find similar

TAP AIR PORTUGAL

Dec 3

ORD7:10 pmChicago O'Hare Intl

11h 55m

1 stop

OPO1:05 pmPorto

Dec 14

OPO5:00 amPorto

15h 45m

1 stop

ORD2:45 pmChicago O'Hare Intl

$427

Find similar

TAP AIR PORTUGAL

Nov 28

ORD8:15 pmChicago O'Hare Intl

13h 40m

1 stop

OPO3:55 pmPorto

Dec 9

OPO8:00 pmPorto

25h 00m

1 stop

ORD3:00 pmChicago O'Hare Intl

$439

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 12/3

7:10 pm-3:05 pm

1 stop13h 55m

Porto

Sun 12/14

5:00 am-2:45 pm

1 stop15h 45m

$427

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 1/13

6:00 pm-12:50 pm

1 stop12h 50m

Porto

Tue 1/20

6:00 am-1:10 pm

1 stop13h 10m

$433

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 1/11

5:55 pm-12:05 pm

1 stop12h 10m

Porto

Tue 1/27

6:00 am-1:10 pm

1 stop13h 10m

$445

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Sun 1/11

7:15 am-12:50 pm

2 stops23h 35m

Porto

Tue 1/27

6:00 am-1:10 pm

1 stop13h 10m

$451

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Wed 1/28

6:50 pm-11:10 am

1 stop34h 20m

Porto

Wed 2/4

12:10 pm-12:45 pm

1 stop30h 35m

$463

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

Tue 3/17

5:10 pm-11:15 am

1 stop13h 05m

Porto

Tue 3/31

8:40 am-3:55 pm

1 stop13h 15m

$464

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 2/6

6:00 am-10:30 am

2 stops22h 30m

Porto

Tue 2/10

6:05 am-8:43 pm

2 stops20h 38m

$492

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Wed 2/4

1:28 pm-10:30 am

2 stops15h 02m

Porto

Wed 2/11

4:10 pm-5:37 pm

2 stops31h 27m

$591

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Tue 3/17

2:00 pm-10:30 am

2 stops15h 30m

Porto

Tue 3/31

5:00 am-6:08 pm

2 stops19h 08m

$597

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

Thu 12/4

1:14 pm-10:30 am

2 stops15h 16m

Porto

Fri 12/12

6:30 am-6:18 pm

2 stops17h 48m

$1,106

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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 February instead. Flights to Porto in February, while not as cheap as those in April, still average around $628.

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 $673 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 $622 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

Direct flights	None

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?
As of November 2025, there are 10 operators available to choose from 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 PORTUGAL	PriceFrom $468	Free Cancellation	Rating 7.1 2,070 reviews	Search TAP AIR PORTUGAL flights
Iberia	PriceFrom $487	Free Cancellation	Rating 7.0 3,032 reviews	Search Iberia flights
British Airways	PriceFrom $504	Free Cancellation	Rating 6.7 7,535 reviews	Search British Airways flights
Lufthansa	PriceFrom $526	Free Cancellation	Rating 6.8 7,581 reviews	Search Lufthansa flights
KLM	PriceFrom $531	Free Cancellation	Rating 7.7 1,418 reviews	Search KLM flights
United Airlines	PriceFrom $545	Free Cancellation	Rating 7.4 9,036 reviews	Search United Airlines flights
American Airlines	PriceFrom $554	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
SWISS	PriceFrom $558	Free Cancellation	Rating 7.5 1,790 reviews	Search SWISS flights
Delta	PriceFrom $638	Free Cancellation	Rating 7.9 8,000 reviews	Search Delta flights
Air Canada	PriceFrom $646	Free Cancellation	Rating 7.1 10,467 reviews	Search Air Canada flights

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Pinhao

Curia

Penafiel

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Mira

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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.