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

Delta and KLM 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.

$397 Cheap Flights from Porto to Illinois in 2026/27

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.

5:55 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

28h 50m1 stop Kastrup Copenhagen

7:10 pm - 12:05 pmORD Chicago O'Hare Intl-OPO Porto

34h 55m1 stop Kastrup Copenhagen

$657Scandinavian Airlines

Thu, Nov 19 - Sat, Dec 5

7:50 pm - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

25h 40m2 stops Madrid Barajas Lisbon Humberto Delgado

8:10 pm - 10:00 pmORD Chicago O'Hare Intl-OPO Porto

19h 50m2 stops Lisbon Humberto Delgado Madrid Barajas

$690Multiple Airlines

Thu, Nov 19 - Fri, Dec 4

7:00 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

14h 30m1 stop Lisbon Humberto Delgado

6:30 pm - 5:30 pmORD Chicago O'Hare Intl-OPO Porto

17h 00m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

$771Multiple Airlines

Sun, Dec 13 - Sat, Jan 9

5:00 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

16h 30m1 stop Lisbon Humberto Delgado

6:30 pm - 5:30 pmORD Chicago O'Hare Intl-OPO Porto

17h 00m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

$779Multiple Airlines

Wed, Dec 16 - Sat, Jan 9

6:05 pm - 5:20 pmOPO Porto-ORD Chicago O'Hare Intl

29h 15m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

6:30 pm - 5:30 pmORD Chicago O'Hare Intl-OPO Porto

17h 00m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

$788Multiple Airlines

Sun, Dec 13 - Sat, Jan 9

5:00 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

15h 25m1 stop Amsterdam Schiphol

10:33 am - 10:35 amORD Chicago O'Hare Intl-OPO Porto

18h 02m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

$800Delta

Sun, Dec 13 - Sat, Jan 9

5:00 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

15h 25m1 stop Amsterdam Schiphol

2:44 pm - 10:35 amORD Chicago O'Hare Intl-OPO Porto

13h 51m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

$800Delta

Sun, Nov 15 - Sat, Nov 28

5:00 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

15h 25m1 stop Amsterdam Schiphol

10:33 am - 10:35 amORD Chicago O'Hare Intl-OPO Porto

18h 02m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

$802Delta

Sun, Dec 13 - Sat, Jan 9

5:00 am - 2:25 pmOPO Porto-ORD Chicago O'Hare Intl

15h 25m1 stop Amsterdam Schiphol

11:14 am - 10:35 amORD Chicago O'Hare Intl-OPO Porto

17h 21m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle

$802Delta

Thu, Nov 19 - Sat, Dec 5

6:10 pm - 7:52 amOPO Porto-ORD Chicago O'Hare Intl

19h 42m1 stop Newark

7:00 pm - 3:00 pmORD Chicago O'Hare Intl-OPO Porto

14h 00m1 stop Lisbon Humberto Delgado

$1,738TAP AIR PORTUGAL

Thu, Dec 17 - Wed, Jan 6

Cheap last minute flights

Enter your travel dates to find the best prices.

5:35 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

29h 10m1 stop Kastrup Copenhagen

7:10 pm - 4:55 pmORD Chicago O'Hare Intl-OPO Porto

15h 45m1 stop Kastrup Copenhagen

$729Scandinavian Airlines

Sun, Nov 8 - Thu, Mar 4

5:35 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

29h 10m1 stop Kastrup Copenhagen

7:10 pm - 11:05 amORD Chicago O'Hare Intl-OPO Porto

33h 55m1 stop Kastrup Copenhagen

$741Scandinavian Airlines

Sun, Nov 8 - Sat, Mar 6

5:35 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

29h 10m1 stop Kastrup Copenhagen

7:10 pm - 11:05 amORD Chicago O'Hare Intl-OPO Porto

33h 55m1 stop Kastrup Copenhagen

$741Scandinavian Airlines

Sun, Nov 8 - Mon, Mar 1

5:35 pm - 10:36 pmOPO Porto-ORD Chicago O'Hare Intl

35h 01m2 stops Kastrup Copenhagen Boston Logan Intl

7:10 pm - 4:55 pmORD Chicago O'Hare Intl-OPO Porto

15h 45m1 stop Kastrup Copenhagen

$759Scandinavian Airlines

Sun, Nov 8 - Thu, Mar 4

10:05 pm - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

47h 25m2 stops Barcelona-El Prat Lisbon Humberto Delgado

6:50 pm - 6:30 pmORD Chicago O'Hare Intl-OPO Porto

17h 40m1 stop Zurich

$763Multiple Airlines

Mon, Nov 9 - Mon, Mar 8

10:05 pm - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

47h 25m2 stops Barcelona-El Prat Lisbon Humberto Delgado

7:50 pm - 6:30 pmORD Chicago O'Hare Intl-OPO Porto

17h 40m1 stop Zurich

$765Multiple Airlines

Mon, Nov 9 - Sun, Mar 14

12:55 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

33h 50m1 stop Kastrup Copenhagen

7:10 pm - 4:55 pmORD Chicago O'Hare Intl-OPO Porto

15h 45m1 stop Kastrup Copenhagen

$785Scandinavian Airlines

Mon, Nov 9 - Thu, Mar 11

12:55 pm - 4:45 pmOPO Porto-ORD Chicago O'Hare Intl

33h 50m1 stop Kastrup Copenhagen

7:10 pm - 11:05 amORD Chicago O'Hare Intl-OPO Porto

33h 55m1 stop Kastrup Copenhagen

$797Scandinavian Airlines

Mon, Nov 9 - Mon, Mar 8

10:05 pm - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

47h 25m2 stops Barcelona-El Prat Lisbon Humberto Delgado

5:40 pm - 11:45 amORD Chicago O'Hare Intl-OPO Porto

12h 05m1 stop Madrid Barajas

$813Multiple Airlines

Mon, Nov 9 - Wed, Mar 10

8:30 am - 3:30 pmOPO Porto-ORD Chicago O'Hare Intl

13h 00m1 stop Lisbon Humberto Delgado

8:10 pm - 6:00 pmORD Chicago O'Hare Intl-OPO Porto

15h 50m1 stop Lisbon Humberto Delgado

$841TAP AIR PORTUGAL

Sun, Nov 8 - Sun, Nov 8

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Delta flights from Porto to Illinois

Our best Delta deals on Porto to Illinois flight tickets

Delta

Nov 15

OPO5:00 amPorto

15h 25m

1 stop

ORD2:25 pmChicago O'Hare Intl

Nov 28

ORD2:44 pmChicago O'Hare Intl

13h 51m

2 stops

OPO10:35 amPorto

$800

Delta

Dec 13

OPO5:00 amPorto

15h 25m

1 stop

ORD2:25 pmChicago O'Hare Intl

Jan 9

ORD10:33 amChicago O'Hare Intl

18h 02m

2 stops

OPO10:35 amPorto

$802

Delta

Nov 15

OPO5:00 amPorto

15h 25m

1 stop

ORD2:25 pmChicago O'Hare Intl

Nov 28

ORD2:44 pmChicago O'Hare Intl

13h 51m

2 stops

OPO10:35 amPorto

$803

Scandinavian Airlines flights from Porto to Illinois

Our best Scandinavian Airlines deals on Porto to Illinois flight tickets

Scandinavian Airlines

Nov 19

OPO5:55 pmPorto

28h 50m

1 stop

ORD4:45 pmChicago O'Hare Intl

Dec 5

ORD7:10 pmChicago O'Hare Intl

34h 55m

1 stop

OPO12:05 pmPorto

$657

Scandinavian Airlines

Nov 8

OPO5:35 pmPorto

29h 10m

1 stop

ORD4:45 pmChicago O'Hare Intl

Mar 4

ORD7:10 pmChicago O'Hare Intl

15h 45m

1 stop

OPO4:55 pmPorto

$729

Scandinavian Airlines

Nov 8

OPO5:35 pmPorto

29h 10m

1 stop

ORD4:45 pmChicago O'Hare Intl

Mar 6

ORD7:10 pmChicago O'Hare Intl

33h 55m

1 stop

OPO11:05 amPorto

$741

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 11/19

5:55 pm-4:45 pm

1 stop28h 50m

Chicago O'Hare Intl

Sat 12/5

7:10 pm-12:05 pm

1 stop34h 55m

$657

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 11/19

7:50 pm-3:30 pm

2 stops25h 40m

Chicago O'Hare Intl

Fri 12/4

8:10 pm-10:00 pm

2 stops19h 50m

$690

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sun 12/13

7:00 am-3:30 pm

1 stop14h 30m

Chicago O'Hare Intl

Sat 1/9

6:30 pm-5:30 pm

2 stops17h 00m

$771

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Wed 12/16

5:00 am-3:30 pm

1 stop16h 30m

Chicago O'Hare Intl

Sat 1/9

6:30 pm-5:30 pm

2 stops17h 00m

$779

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sun 12/13

6:05 pm-5:20 pm

2 stops29h 15m

Chicago O'Hare Intl

Sat 1/9

6:30 pm-5:30 pm

2 stops17h 00m

$788

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sun 12/13

5:00 am-2:25 pm

1 stop15h 25m

Chicago O'Hare Intl

Sat 1/9

10:33 am-10:35 am

2 stops18h 02m

$800

Quickest round-trip

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sun 11/15

5:00 am-2:25 pm

1 stop15h 25m

Chicago O'Hare Intl

Sat 11/28

2:44 pm-10:35 am

2 stops13h 51m

$800

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Sun 12/13

5:00 am-2:25 pm

1 stop15h 25m

Chicago O'Hare Intl

Sat 1/9

10:33 am-10:35 am

2 stops18h 02m

$802

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 11/19

5:00 am-2:25 pm

1 stop15h 25m

Chicago O'Hare Intl

Sat 12/5

11:14 am-10:35 am

2 stops17h 21m

$802

PortoChicago

OPO Porto - ORD Chicago O'Hare Intl

OPOORD

Porto

Thu 12/17

6:10 pm-7:52 am

1 stop19h 42m

Chicago O'Hare Intl

Wed 1/6

7:00 pm-3:00 pm

1 stop14h 00m

$1,738

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 April 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	$397
Fastest flight time	15h 25m
Direct flights	None

The best one-way flight to Illinois from Porto in the past 72 hours is $397. The best round-trip flight deal from Porto to Illinois found on momondo in the last 72 hours is $657.

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.