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

American Airlines and TAP AIR PORTUGAL are the most popular carriers operating from Porto to Illinois

When did momondo last update prices for flights from Porto Airport to Illinois?

Prices for flights from Porto Airport to Illinois are refreshed on a daily basis.

How old do you have to be to fly from Porto Airport to Illinois?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Porto Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$415 Cheap Flights from Porto to Illinois in 2026

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Find the cheapest flights from Porto to Illinois

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:50 am - 4:10 pm

OPO

ORD

34h 20m

1 stop

7:15 pm - 11:00 am

ORD

OPO

33h 45m

1 stop

$755Scandinavian Airlines

Thu, Aug 27 - Tue, Sep 1

6:15 am - 2:25 pm

OPO

ORD

14h 10m

1 stop

4:55 pm - 1:35 pm

ORD

OPO

14h 40m

1 stop

$769Multiple Airlines

Tue, Sep 1 - Mon, Sep 7

7:10 am - 5:50 pm

OPO

ORD

40h 40m

2 stops

4:55 pm - 1:35 pm

ORD

OPO

14h 40m

1 stop

$832Multiple Airlines

Tue, Sep 1 - Mon, Sep 7

8:40 am - 10:05 pm

OPO

ORD

19h 25m

2 stops

2:00 pm - 7:00 am

ORD

OPO

35h 00m

2 stops

$851Air Canada

Tue, Jun 16 - Tue, Jun 23

8:40 am - 10:18 am

OPO

ORD

31h 38m

3 stops

2:00 pm - 7:00 am

ORD

OPO

35h 00m

2 stops

$861Air Canada

Tue, Jun 16 - Tue, Jun 23

10:40 am - 9:40 am

OPO

ORD

29h 00m

1 stop

8:10 pm - 10:00 am

ORD

OPO

31h 50m

1 stop

$889Turkish Airlines

Mon, Jun 22 - Tue, Jul 7

12:10 pm - 11:29 pm

OPO

STL

17h 19m

2 stops

12:23 pm - 9:45 am

STL

OPO

15h 22m

1 stop

$953Lufthansa

Thu, Jun 4 - Mon, Jun 8

4:35 pm - 1:25 pm

OPO

STL

26h 50m

1 stop

12:23 pm - 6:55 am

STL

OPO

12h 32m

1 stop

$968Lufthansa

Thu, Jun 4 - Mon, Jun 8

11:50 am - 6:41 pm

OPO

STL

12h 51m

1 stop

8:00 am - 9:45 am

STL

OPO

19h 45m

2 stops

$973United Airlines

Thu, Oct 8 - Mon, Oct 12

12:35 pm - 9:48 am

OPO

STL

27h 13m

2 stops

1:29 pm - 9:45 am

STL

OPO

14h 16m

2 stops

$975United Airlines

Thu, Oct 8 - Mon, Oct 12

Turkish Airlines flights from Porto to Illinois

Our best Turkish Airlines deals on Porto to Illinois flight tickets

Turkish Airlines

Jun 22

OPO10:40 amPorto

29h 00m

1 stop

ORD9:40 amChicago O'Hare Intl

Jul 7

ORD8:10 pmChicago O'Hare Intl

31h 50m

1 stop

OPO10:00 amPorto

$889

Turkish Airlines

Jun 22

OPO10:40 amPorto

29h 00m

1 stop

ORD9:40 amChicago O'Hare Intl

Jul 7

ORD8:10 pmChicago O'Hare Intl

37h 30m

1 stop

OPO3:40 pmPorto

$897

Lufthansa flights from Porto to Illinois

Our best Lufthansa deals on Porto to Illinois flight tickets

Lufthansa

Jun 10

OPO12:00 pmPorto

13h 55m

1 stop

ORD7:55 pmChicago O'Hare Intl

Jun 24

ORD3:10 pmChicago O'Hare Intl

14h 10m

1 stop

OPO11:20 amPorto

$905

Lufthansa

Jun 10

OPO12:00 pmPorto

13h 55m

1 stop

ORD7:55 pmChicago O'Hare Intl

Jun 24

ORD6:30 pmChicago O'Hare Intl

22h 25m

1 stop

OPO10:55 pmPorto

$934

Lufthansa

Jun 4

OPO12:10 pmPorto

17h 19m

2 stops

STL11:29 pmLambert-St Louis

Jun 8

STL12:23 pmLambert-St Louis

15h 22m

1 stop

OPO9:45 amPorto

$953

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 8/27

11:50 am-4:10 pm

1 stop34h 20m

Chicago O'Hare Intl

Tue 9/1

7:15 pm-11:00 am

1 stop33h 45m

$755

Quickest round-trip

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 9/1

6:15 am-2:25 pm

1 stop14h 10m

Chicago O'Hare Intl

Mon 9/7

4:55 pm-1:35 pm

1 stop14h 40m

$769

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 9/1

7:10 am-5:50 pm

2 stops40h 40m

Chicago O'Hare Intl

Mon 9/7

4:55 pm-1:35 pm

1 stop14h 40m

$832

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 6/16

8:40 am-10:05 pm

2 stops19h 25m

Chicago O'Hare Intl

Tue 6/23

2:00 pm-7:00 am

2 stops35h 00m

$851

PortoChicago

OPO - ORD

OPOORD

Porto

Tue 6/16

8:40 am-10:18 am

3 stops31h 38m

Chicago O'Hare Intl

Tue 6/23

2:00 pm-7:00 am

2 stops35h 00m

$861

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 6/22

10:40 am-9:40 am

1 stop29h 00m

Chicago O'Hare Intl

Tue 7/7

8:10 pm-10:00 am

1 stop31h 50m

$889

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 6/4

12:10 pm-11:29 pm

2 stops17h 19m

Lambert-St Louis

Mon 6/8

12:23 pm-9:45 am

1 stop15h 22m

$953

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 6/4

4:35 pm-1:25 pm

1 stop26h 50m

Lambert-St Louis

Mon 6/8

12:23 pm-6:55 am

1 stop12h 32m

$968

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 10/8

11:50 am-6:41 pm

1 stop12h 51m

Lambert-St Louis

Mon 10/12

8:00 am-9:45 am

2 stops19h 45m

$973

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 10/8

12:35 pm-9:48 am

2 stops27h 13m

Lambert-St Louis

Mon 10/12

1:29 pm-9:45 am

2 stops14h 16m

$975

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 Porto to Illinois

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 Illinois?

The cheapest month to fly to Illinois from Porto is in October. Flight prices, which tend to average around $506, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of October, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $570.

Cheap Porto to Illinois flight deals and tips

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

Fastest flight time	13h 35m
Direct flights	None

The fastest flight from Porto to Illinois takes 13h 35m

There are no direct flights from Porto to Illinois. There are no popular flight routes from Porto to Illinois.

Search flight deals

Frequently asked questions about flying from Porto to Illinois

When did momondo last update prices for flights from Porto Airport to Illinois?
Prices for flights from Porto Airport to Illinois are refreshed on a daily basis.
How old do you have to be to fly from Porto Airport to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Porto Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Porto to Illinois?

Finding the right flight to Illinois from Porto is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Illinois quick and easy, saving you time and money.

Can I find flights from Porto to Illinois with flexible booking policies on momondo?

Flights from Porto to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Porto to Illinois?

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 Illinois from Porto.

I’m not ready to book a flight from Porto to Illinois right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Porto to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.