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

Delta, Turkish Airlines, and Iberia 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.

$409 Cheap Flights from Porto to Illinois in 2026

Find the cheapest flights from Porto to Illinois

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:15 am - 7:52 pmOPO Porto-ORD Chicago O'Hare Intl

19h 37m2 stops Madrid Barajas Montreal Pierre Elliott Trudeau Intl

1:55 pm - 10:50 amORD Chicago O'Hare Intl-OPO Porto

14h 55m2 stops Montreal Pierre Elliott Trudeau Intl Madrid Barajas

$671Multiple Airlines

Sat, Nov 21 - Sat, Nov 28

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

6:00 pm - 3:00 pmORD Chicago O'Hare Intl-OPO Porto

15h 00m1 stop Lisbon Humberto Delgado

$686TAP AIR PORTUGAL

Thu, Oct 1 - Wed, Oct 14

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

6:00 pm - 3:00 pmORD Chicago O'Hare Intl-OPO Porto

15h 00m1 stop Lisbon Humberto Delgado

$687TAP AIR PORTUGAL

Thu, Oct 1 - Wed, Oct 14

7:00 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

13h 25m1 stop Madrid Barajas

4:55 pm - 10:10 amORD Chicago O'Hare Intl-OPO Porto

11h 15m1 stop Madrid Barajas

$691Multiple Airlines

Thu, Oct 1 - Wed, Oct 14

7:00 am - 12:40 pmOPO Porto-ORD Chicago O'Hare Intl

11h 40m1 stop Lisbon Humberto Delgado

6:00 pm - 9:10 amORD Chicago O'Hare Intl-OPO Porto

33h 10m1 stop Lisbon Humberto Delgado

$694TAP AIR PORTUGAL

Thu, Oct 1 - Wed, Oct 14

5:00 am - 7:52 pmOPO Porto-ORD Chicago O'Hare Intl

20h 52m3 stops Lisbon Humberto Delgado Madrid Barajas Montreal Pierre Elliott Trudeau Intl

1:55 pm - 1:30 pmORD Chicago O'Hare Intl-OPO Porto

17h 35m3 stops Montreal Pierre Elliott Trudeau Intl Madrid Barajas Lisbon Humberto Delgado

$702Multiple Airlines

Sat, Nov 21 - Sat, Nov 28

11:50 am - 4:10 pmOPO Porto-ORD Chicago O'Hare Intl

34h 20m1 stop Kastrup Copenhagen

8:15 pm - 4:55 pmORD Chicago O'Hare Intl-OPO Porto

15h 40m1 stop Kastrup Copenhagen

$707Scandinavian Airlines

Thu, Oct 22 - Thu, Oct 29

5:55 pm - 4:10 pmOPO Porto-ORD Chicago O'Hare Intl

28h 15m1 stop Kastrup Copenhagen

8:15 pm - 11:10 amORD Chicago O'Hare Intl-OPO Porto

33h 55m1 stop Kastrup Copenhagen

$735Scandinavian Airlines

Fri, Oct 23 - Thu, Oct 29

5:55 pm - 9:31 pmOPO Porto-ORD Chicago O'Hare Intl

33h 36m2 stops Kastrup Copenhagen Boston Logan Intl

8:15 pm - 4:55 pmORD Chicago O'Hare Intl-OPO Porto

15h 40m1 stop Kastrup Copenhagen

$745Scandinavian Airlines

Fri, Oct 23 - Thu, Oct 29

10:20 pm - 2:00 pmOPO Porto-ORD Chicago O'Hare Intl

21h 40m1 stop Dublin

9:05 pm - 9:20 pmORD Chicago O'Hare Intl-OPO Porto

19h 15m1 stop Dublin

$767Multiple Airlines

Thu, Oct 22 - Thu, Oct 29

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Delta flights from Porto to Illinois

Our best Delta deals on Porto to Illinois flight tickets

Delta

Oct 1

OPO5:00 amPorto

15h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

Oct 14

ORD5:29 pmChicago O'Hare Intl

15h 56m

2 stops

OPO3:25 pmPorto

$780

Delta

Oct 1

OPO5:00 amPorto

15h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

Oct 14

ORD5:29 pmChicago O'Hare Intl

15h 56m

2 stops

OPO3:25 pmPorto

$781

Delta

Dec 13

OPO5:00 amPorto

21h 15m

2 stops

ORD8:15 pmChicago O'Hare Intl

Jan 9

ORD1:35 pmChicago O'Hare Intl

15h 00m

2 stops

OPO10:35 amPorto

$785

British Airways flights from Porto to Illinois

Our best British Airways deals on Porto to Illinois flight tickets

British Airways

Oct 1

OPO8:20 amPorto

21h 16m

2 stops

ORD11:36 pmChicago O'Hare Intl

Oct 14

ORD9:15 pmChicago O'Hare Intl

15h 50m

1 stop

OPO7:05 pmPorto

$809

British Airways

Oct 1

OPO8:20 amPorto

21h 16m

2 stops

ORD11:36 pmChicago O'Hare Intl

Oct 14

ORD9:15 pmChicago O'Hare Intl

15h 50m

1 stop

OPO7:05 pmPorto

$810

British Airways

Oct 1

OPO7:55 pmPorto

25h 00m

1 stop

ORD2:55 pmChicago O'Hare Intl

Oct 14

ORD9:15 pmChicago O'Hare Intl

15h 50m

1 stop

OPO7:05 pmPorto

$843

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sat 11/21

6:15 am-7:52 pm

2 stops19h 37m

Chicago O'Hare Intl

Sat 11/28

1:55 pm-10:50 am

2 stops14h 55m

$671

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 10/1

7:00 am-12:40 pm

1 stop11h 40m

Chicago O'Hare Intl

Wed 10/14

6:00 pm-3:00 pm

1 stop15h 00m

$686

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 10/1

7:00 am-12:40 pm

1 stop11h 40m

Chicago O'Hare Intl

Wed 10/14

6:00 pm-3:00 pm

1 stop15h 00m

$687

Quickest round-trip

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 10/1

7:00 am-2:25 pm

1 stop13h 25m

Chicago O'Hare Intl

Wed 10/14

4:55 pm-10:10 am

1 stop11h 15m

$691

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 10/1

7:00 am-12:40 pm

1 stop11h 40m

Chicago O'Hare Intl

Wed 10/14

6:00 pm-9:10 am

1 stop33h 10m

$694

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sat 11/21

5:00 am-7:52 pm

3 stops20h 52m

Chicago O'Hare Intl

Sat 11/28

1:55 pm-1:30 pm

3 stops17h 35m

$702

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 10/22

11:50 am-4:10 pm

1 stop34h 20m

Chicago O'Hare Intl

Thu 10/29

8:15 pm-4:55 pm

1 stop15h 40m

$707

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Fri 10/23

5:55 pm-4:10 pm

1 stop28h 15m

Chicago O'Hare Intl

Thu 10/29

8:15 pm-11:10 am

1 stop33h 55m

$735

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Fri 10/23

5:55 pm-9:31 pm

2 stops33h 36m

Chicago O'Hare Intl

Thu 10/29

8:15 pm-4:55 pm

1 stop15h 40m

$745

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 10/22

10:20 pm-2:00 pm

1 stop21h 40m

Chicago O'Hare Intl

Thu 10/29

9:05 pm-9:20 pm

1 stop19h 15m

$767

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 January. Flight prices, which tend to average around $590, 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 January, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $830.

Cheap Porto to Illinois flight deals and tips

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

Best Price Found	$409
Fastest flight time	15h 25m
Direct flights	None

The best one-way flight to Illinois from Porto in the past 72 hours is $409. The best round-trip flight deal from Porto to Illinois found on momondo in the last 72 hours is $671.

The fastest flight from Porto to Illinois takes 15h 25m

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.