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.

$371 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.

5:35 pm - 4:45 pm

OPO

ORD

29h 10m

1 stop

8:20 pm - 4:45 pm

ORD

OPO

15h 25m

1 stop

$530Scandinavian Airlines

Fri, Mar 6 - Sun, Mar 22

5:35 pm - 4:45 pm

OPO

ORD

29h 10m

1 stop

8:20 pm - 4:45 pm

ORD

OPO

15h 25m

1 stop

$533Scandinavian Airlines

Fri, Mar 6 - Sun, Mar 22

6:05 pm - 4:00 pm

OPO

ORD

27h 55m

1 stop

6:00 pm - 10:55 am

ORD

OPO

10h 55m

1 stop

$573TAP AIR PORTUGAL

Thu, Apr 23 - Sun, Apr 26

8:00 pm - 12:40 am

OPO

ORD

33h 40m

2 stops

6:01 pm - 1:10 pm

ORD

OPO

14h 09m

1 stop

$622Multiple Airlines

Mon, Mar 9 - Sat, Mar 14

8:40 pm - 4:00 pm

OPO

ORD

25h 20m

2 stops

6:00 pm - 11:50 pm

ORD

OPO

23h 50m

2 stops

$669Multiple Airlines

Thu, Apr 23 - Sun, Apr 26

6:45 pm - 2:20 pm

OPO

ORD

25h 35m

2 stops

6:20 pm - 11:00 pm

ORD

OPO

23h 40m

2 stops

$696Multiple Airlines

Fri, Mar 6 - Sun, Mar 22

12:35 pm - 8:17 pm

OPO

ORD

13h 42m

1 stop

2:30 pm - 9:45 am

ORD

OPO

13h 15m

1 stop

$708United Airlines

Thu, Apr 23 - Sun, Apr 26

12:35 pm - 10:59 pm

OPO

STL

16h 24m

2 stops

11:25 am - 9:30 am

STL

OPO

16h 05m

2 stops

$977United Airlines

Sun, Feb 22 - Thu, Feb 26

6:00 am - 1:55 pm

OPO

STL

13h 55m

1 stop

11:25 am - 3:05 pm

STL

OPO

22h 40m

2 stops

$4,243Lufthansa

Sun, Mar 8 - Sat, Mar 14

6:00 am - 1:55 pm

OPO

STL

13h 55m

1 stop

7:00 am - 9:30 am

STL

OPO

21h 30m

1 stop

$6,054Lufthansa

Sun, Mar 8 - Sat, Mar 14

TAP AIR PORTUGAL flights from Porto to Illinois

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

TAP AIR PORTUGAL

Apr 23

OPO6:05 pmPorto

27h 55m

1 stop

ORD4:00 pmChicago O'Hare Intl

Apr 26

ORD6:00 pmChicago O'Hare Intl

10h 55m

1 stop

OPO10:55 amPorto

$573

TAP AIR PORTUGAL

Feb 14

OPO8:00 pmPorto

24h 45m

1 stop

ORD2:45 pmChicago O'Hare Intl

Feb 18

ORD7:10 pmChicago O'Hare Intl

20h 50m

1 stop

OPO10:00 pmPorto

$751

United Airlines flights from Porto to Illinois

Our best United Airlines deals on Porto to Illinois flight tickets

United Airlines

Apr 23

OPO12:35 pmPorto

13h 42m

1 stop

ORD8:17 pmChicago O'Hare Intl

Apr 26

ORD2:30 pmChicago O'Hare Intl

13h 15m

1 stop

OPO9:45 amPorto

$708

United Airlines

May 21

OPO12:35 pmPorto

12h 22m

1 stop

ORD6:57 pmChicago O'Hare Intl

May 26

ORD3:40 pmChicago O'Hare Intl

12h 05m

1 stop

OPO9:45 amPorto

$749

United Airlines

Mar 4

OPO6:00 amPorto

13h 25m

1 stop

ORD1:25 pmChicago O'Hare Intl

Mar 8

ORD2:00 pmChicago O'Hare Intl

14h 30m

2 stops

OPO9:30 amPorto

$806

Fly from

Fly to

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 3/6

5:35 pm-4:45 pm

1 stop29h 10m

Chicago O'Hare Intl

Sun 3/22

8:20 pm-4:45 pm

1 stop15h 25m

$530

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 3/6

5:35 pm-4:45 pm

1 stop29h 10m

Chicago O'Hare Intl

Sun 3/22

8:20 pm-4:45 pm

1 stop15h 25m

$533

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 4/23

6:05 pm-4:00 pm

1 stop27h 55m

Chicago O'Hare Intl

Sun 4/26

6:00 pm-10:55 am

1 stop10h 55m

$573

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 3/9

8:00 pm-12:40 am

2 stops33h 40m

Chicago O'Hare Intl

Sat 3/14

6:01 pm-1:10 pm

1 stop14h 09m

$622

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 4/23

8:40 pm-4:00 pm

2 stops25h 20m

Chicago O'Hare Intl

Sun 4/26

6:00 pm-11:50 pm

2 stops23h 50m

$669

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 3/6

6:45 pm-2:20 pm

2 stops25h 35m

Chicago O'Hare Intl

Sun 3/22

6:20 pm-11:00 pm

2 stops23h 40m

$696

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 4/23

12:35 pm-8:17 pm

1 stop13h 42m

Chicago O'Hare Intl

Sun 4/26

2:30 pm-9:45 am

1 stop13h 15m

$708

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sun 2/22

12:35 pm-10:59 pm

2 stops16h 24m

Lambert-St Louis

Thu 2/26

11:25 am-9:30 am

2 stops16h 05m

$977

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sun 3/8

6:00 am-1:55 pm

1 stop13h 55m

Lambert-St Louis

Sat 3/14

11:25 am-3:05 pm

2 stops22h 40m

$4,243

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Sun 3/8

6:00 am-1:55 pm

1 stop13h 55m

Lambert-St Louis

Sat 3/14

7:00 am-9:30 am

1 stop21h 30m

$6,054

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

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

Iberia and Lufthansa are the most popular carriers operating from Porto to Illinois

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 42m
Direct flights	None

The fastest flight from Porto to Illinois takes 13h 42m

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

Search flight deals

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.