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.

$407 Cheap Flights from Porto to Illinois in 2025/26

1 adult

0 bags

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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.

6:00 pm - 3:25 pm

OPO

ORD

27h 25m1 stop

7:10 pm - 10:00 pm

ORD

OPO

20h 50m1 stop

$581TAP AIR PORTUGAL

Thu, Jan 15 - Wed, Jan 28

1:00 pm - 4:45 pm

OPO

ORD

33h 45m2 stops

7:20 pm - 9:15 pm

ORD

OPO

19h 55m2 stops

$609Multiple Airlines

Thu, Jan 15 - Wed, Jan 28

1:00 pm - 4:45 pm

OPO

ORD

33h 45m2 stops

7:20 pm - 9:15 pm

ORD

OPO

19h 55m2 stops

$612Multiple Airlines

Thu, Jan 15 - Wed, Jan 28

12:05 pm - 4:45 pm

OPO

ORD

34h 40m3 stops

7:20 pm - 9:15 pm

ORD

OPO

19h 55m2 stops

$625Multiple Airlines

Thu, Jan 15 - Wed, Jan 28

1:00 pm - 4:45 pm

OPO

ORD

33h 45m2 stops

7:20 pm - 9:15 pm

ORD

OPO

19h 55m2 stops

$627Multiple Airlines

Thu, Jan 15 - Wed, Jan 28

6:35 am - 10:42 pm

OPO

ORD

46h 07m3 stops

6:30 pm - 10:30 pm

ORD

OPO

22h 00m3 stops

$666Multiple Airlines

Thu, Jan 15 - Wed, Jan 28

11:35 am - 8:18 am

OPO

ORD

26h 43m2 stops

6:30 pm - 10:45 pm

ORD

OPO

22h 15m3 stops

$689Multiple Airlines

Mon, Jan 12 - Sun, Jan 25

6:00 am - 9:13 pm

OPO

STL

21h 13m2 stops

11:20 am - 2:55 pm

STL

OPO

21h 35m2 stops

$859United Airlines

Thu, Jan 22 - Mon, Jan 26

6:00 am - 9:13 pm

OPO

STL

21h 13m2 stops

11:20 am - 11:40 am

STL

OPO

18h 20m2 stops

$860United Airlines

Thu, Jan 22 - Mon, Jan 26

6:00 am - 9:13 pm

OPO

STL

21h 13m2 stops

11:20 am - 2:55 pm

STL

OPO

21h 35m2 stops

$861United Airlines

Thu, Jan 22 - Mon, Jan 26

TAP AIR PORTUGAL flights from Porto to Illinois

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

TAP AIR PORTUGAL

Jan 15

OPO8:00 pmPorto

25h 25m

1 stop

ORD3:25 pmChicago O'Hare Intl

Jan 28

ORD7:10 pmChicago O'Hare Intl

16h 50m

1 stop

OPO6:00 pmPorto

$581

Find similar

TAP AIR PORTUGAL

Dec 26

OPO9:00 amPorto

12h 25m

1 stop

ORD3:25 pmChicago O'Hare Intl

Jan 21

ORD7:10 pmChicago O'Hare Intl

16h 50m

1 stop

OPO6:00 pmPorto

$726

Find similar

TAP AIR PORTUGAL

Dec 24

OPO8:55 amPorto

12h 05m

1 stop

ORD3:00 pmChicago O'Hare Intl

Jan 18

ORD8:25 pmChicago O'Hare Intl

10h 35m

1 stop

OPO1:00 pmPorto

$782

Find similar

British Airways flights from Porto to Illinois

Our best British Airways deals on Porto to Illinois flight tickets

British Airways

Jan 15

OPO8:20 amPorto

17h 55m

2 stops

ORD8:15 pmChicago O'Hare Intl

Jan 28

ORD6:45 pmChicago O'Hare Intl

16h 00m

1 stop

OPO4:45 pmPorto

$812

Find similar

British Airways

Dec 24

OPO8:20 amPorto

12h 35m

1 stop

ORD2:55 pmChicago O'Hare Intl

Jan 21

ORD8:45 pmChicago O'Hare Intl

14h 00m

1 stop

OPO4:45 pmPorto

$1,536

Find similar

British Airways

Dec 23

OPO12:25 pmPorto

32h 30m

1 stop

ORD2:55 pmChicago O'Hare Intl

Jan 18

ORD8:45 pmChicago O'Hare Intl

13h 55m

1 stop

OPO4:40 pmPorto

$1,546

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

6:00 pm-3:25 pm

1 stop27h 25m

Chicago O'Hare Intl

Wed 1/28

7:10 pm-10:00 pm

1 stop20h 50m

$581

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

1:00 pm-4:45 pm

2 stops33h 45m

Chicago O'Hare Intl

Wed 1/28

7:20 pm-9:15 pm

2 stops19h 55m

$609

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

1:00 pm-4:45 pm

2 stops33h 45m

Chicago O'Hare Intl

Wed 1/28

7:20 pm-9:15 pm

2 stops19h 55m

$612

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

12:05 pm-4:45 pm

3 stops34h 40m

Chicago O'Hare Intl

Wed 1/28

7:20 pm-9:15 pm

2 stops19h 55m

$625

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

1:00 pm-4:45 pm

2 stops33h 45m

Chicago O'Hare Intl

Wed 1/28

7:20 pm-9:15 pm

2 stops19h 55m

$627

PortoChicago

OPO - ORD

OPOORD

Porto

Thu 1/15

6:35 am-10:42 pm

3 stops46h 07m

Chicago O'Hare Intl

Wed 1/28

6:30 pm-10:30 pm

3 stops22h 00m

$666

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 1/12

11:35 am-8:18 am

2 stops26h 43m

Chicago O'Hare Intl

Sun 1/25

6:30 pm-10:45 pm

3 stops22h 15m

$689

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 1/22

6:00 am-9:13 pm

2 stops21h 13m

Lambert-St Louis

Mon 1/26

11:20 am-2:55 pm

2 stops21h 35m

$859

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 1/22

6:00 am-9:13 pm

2 stops21h 13m

Lambert-St Louis

Mon 1/26

11:20 am-11:40 am

2 stops18h 20m

$860

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 1/22

6:00 am-9:13 pm

2 stops21h 13m

Lambert-St Louis

Mon 1/26

11:20 am-2:55 pm

2 stops21h 35m

$861

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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 day to depart on your flight to Illinois?

The cheapest day to depart from Porto to Illinois is on a Saturday when prices can be found for as low as $581. Flights from Porto to Illinois on a Friday will generally be more expensive and average around $956. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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 25m
Direct flights	None

The fastest flight from Porto to Illinois takes 12h 25m

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.