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

Iberia, Turkish 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.

$385 Cheap Flights from Porto to Illinois in 2026

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.

7:10 am - 12:40 pm

OPO

ORD

35h 30m

2 stops

4:40 pm - 11:50 pm

ORD

OPO

25h 10m

2 stops

$603Multiple Airlines

Wed, Aug 19 - Wed, Aug 26

6:00 am - 7:55 pm

OPO

ORD

19h 55m

1 stop

10:30 pm - 10:55 pm

ORD

OPO

18h 25m

1 stop

$610Lufthansa

Mon, Aug 24 - Sun, Sep 6

6:00 am - 7:55 pm

OPO

ORD

19h 55m

1 stop

10:30 pm - 10:55 pm

ORD

OPO

18h 25m

1 stop

$612Lufthansa

Mon, Aug 24 - Sun, Sep 6

12:15 pm - 12:35 pm

OPO

ORD

30h 20m

1 stop

7:05 pm - 6:30 pm

ORD

OPO

17h 25m

1 stop

$615SWISS

Thu, Oct 1 - Wed, Oct 14

8:40 am - 12:35 pm

OPO

ORD

33h 55m

1 stop

2:20 pm - 11:25 am

ORD

OPO

15h 05m

1 stop

$622SWISS

Sun, Aug 23 - Mon, Sep 7

6:00 am - 7:55 pm

OPO

ORD

19h 55m

1 stop

7:48 pm - 7:00 am

ORD

OPO

29h 12m

2 stops

$623Multiple Airlines

Mon, Aug 24 - Sun, Sep 6

6:00 am - 10:13 pm

OPO

STL

21h 13m

2 stops

4:40 pm - 9:30 am

STL

OPO

34h 50m

2 stops

$943United Airlines

Sun, Nov 1 - Fri, Nov 20

12:35 pm - 9:51 pm

OPO

STL

15h 16m

1 stop

3:40 pm - 3:20 pm

STL

OPO

17h 40m

1 stop

$972United Airlines

Sun, Nov 1 - Fri, Nov 20

8:20 am - 8:55 pm

OPO

STL

18h 35m

2 stops

1:26 pm - 11:45 am

STL

OPO

16h 19m

2 stops

$1,135American Airlines

Wed, Jul 29 - Sun, Aug 2

8:20 am - 7:29 pm

OPO

STL

17h 09m

2 stops

1:25 pm - 11:45 am

STL

OPO

16h 20m

2 stops

$1,138American Airlines

Sat, Jul 25 - Tue, Jul 28

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SWISS flights from Porto to Illinois

Our best SWISS deals on Porto to Illinois flight tickets

SWISS

Oct 1

OPO12:15 pmPorto

30h 20m

1 stop

ORD12:35 pmChicago O'Hare Intl

Oct 14

ORD7:05 pmChicago O'Hare Intl

17h 25m

1 stop

OPO6:30 pmPorto

$615

SWISS

Aug 23

OPO8:40 amPorto

33h 55m

1 stop

ORD12:35 pmChicago O'Hare Intl

Sep 7

ORD2:20 pmChicago O'Hare Intl

15h 05m

1 stop

OPO11:25 amPorto

$622

SWISS

Aug 23

OPO3:00 amPorto

15h 35m

1 stop

ORD12:35 pmChicago O'Hare Intl

Sep 6

ORD7:05 pmChicago O'Hare Intl

17h 10m

1 stop

OPO6:15 pmPorto

$624

Lufthansa flights from Porto to Illinois

Our best Lufthansa deals on Porto to Illinois flight tickets

Lufthansa

Aug 24

OPO6:00 amPorto

19h 55m

1 stop

ORD7:55 pmChicago O'Hare Intl

Sep 6

ORD10:30 pmChicago O'Hare Intl

18h 25m

1 stop

OPO10:55 pmPorto

$610

Lufthansa

Aug 24

OPO6:00 amPorto

19h 55m

1 stop

ORD7:55 pmChicago O'Hare Intl

Sep 6

ORD10:30 pmChicago O'Hare Intl

18h 25m

1 stop

OPO10:55 pmPorto

$612

Lufthansa

Aug 24

OPO6:00 amPorto

19h 55m

1 stop

ORD7:55 pmChicago O'Hare Intl

Sep 6

ORD10:30 pmChicago O'Hare Intl

18h 25m

1 stop

OPO10:55 pmPorto

$619

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 8/19

7:10 am-12:40 pm

2 stops35h 30m

Chicago O'Hare Intl

Wed 8/26

4:40 pm-11:50 pm

2 stops25h 10m

$603

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 8/24

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Sun 9/6

10:30 pm-10:55 pm

1 stop18h 25m

$610

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 8/24

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Sun 9/6

10:30 pm-10:55 pm

1 stop18h 25m

$612

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 10/1

12:15 pm-12:35 pm

1 stop30h 20m

Chicago O'Hare Intl

Wed 10/14

7:05 pm-6:30 pm

1 stop17h 25m

$615

PortoChicago

OPO - ORD

OPOORD

Porto

Sun 8/23

8:40 am-12:35 pm

1 stop33h 55m

Chicago O'Hare Intl

Mon 9/7

2:20 pm-11:25 am

1 stop15h 05m

$622

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 8/24

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Sun 9/6

7:48 pm-7:00 am

2 stops29h 12m

$623

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sun 11/1

6:00 am-10:13 pm

2 stops21h 13m

Lambert-St Louis

Fri 11/20

4:40 pm-9:30 am

2 stops34h 50m

$943

Quickest round-trip

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sun 11/1

12:35 pm-9:51 pm

1 stop15h 16m

Lambert-St Louis

Fri 11/20

3:40 pm-3:20 pm

1 stop17h 40m

$972

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 7/29

8:20 am-8:55 pm

2 stops18h 35m

Lambert-St Louis

Sun 8/2

1:26 pm-11:45 am

2 stops16h 19m

$1,135

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sat 7/25

8:20 am-7:29 pm

2 stops17h 09m

Lambert-St Louis

Tue 7/28

1:25 pm-11:45 am

2 stops16h 20m

$1,138

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	12h 00m
Direct flights	None

The fastest flight from Porto to Illinois takes 12h 00m

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.