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Cheap flights from Porto to Chicago from $400

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Porto to Chicago departing on 9/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Porto to Chicago

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:55 pm - 4:05 pm
OPO
-
ORD
25h 10m
2 stops
Multiple Airlines Logo
6:00 pm - 11:50 pm
ORD
-
OPO
23h 50m
2 stops
$596Multiple Airlines
Fri, Sep 4 - Sun, Sep 20
Multiple Airlines Logo
7:10 am - 12:40 pm
OPO
-
ORD
35h 30m
2 stops
Multiple Airlines Logo
6:00 pm - 11:50 pm
ORD
-
OPO
23h 50m
2 stops
$604Multiple Airlines
Wed, Sep 30 - Sun, Oct 11
Multiple Airlines Logo
7:10 am - 12:40 pm
OPO
-
ORD
35h 30m
2 stops
Multiple Airlines Logo
6:00 pm - 11:50 pm
ORD
-
OPO
23h 50m
2 stops
$611Multiple Airlines
Wed, Sep 16 - Wed, Sep 23
SWISS Logo
12:15 pm - 12:35 pm
OPO
-
ORD
30h 20m
1 stop
SWISS Logo
2:20 pm - 6:15 pm
ORD
-
OPO
21h 55m
1 stop
$612SWISS
Wed, Sep 30 - Sun, Oct 11
SWISS Logo
8:40 am - 3:55 pm
OPO
-
ORD
13h 15m
1 stop
SWISS Logo
7:05 pm - 6:15 pm
ORD
-
OPO
17h 10m
1 stop
$623SWISS
Fri, Sep 4 - Sun, Sep 20
United Airlines Logo
6:00 am - 7:55 pm
OPO
-
ORD
19h 55m
1 stop
United Airlines Logo
5:00 am - 6:55 am
ORD
-
OPO
19h 55m
1 stop
$630United Airlines
Mon, Aug 24 - Mon, Sep 7
British Airways Logo
9:25 pm - 3:55 pm
OPO
-
ORD
24h 30m
1 stop
British Airways Logo
7:05 pm - 7:05 pm
ORD
-
OPO
18h 00m
1 stop
$638British Airways
Mon, Sep 14 - Wed, Sep 30
SWISS Logo
8:40 am - 3:55 pm
OPO
-
ORD
13h 15m
1 stop
SWISS Logo
2:20 pm - 11:25 am
ORD
-
OPO
15h 05m
1 stop
$649SWISS
Wed, Sep 23 - Mon, Sep 28
Multiple Airlines Logo
6:00 am - 7:55 pm
OPO
-
ORD
19h 55m
1 stop
Multiple Airlines Logo
3:40 pm - 1:45 pm
ORD
-
OPO
16h 05m
2 stops
$653Multiple Airlines
Fri, Sep 4 - Sun, Sep 20
Iberia Logo
8:40 pm - 2:25 pm
OPO
-
ORD
23h 45m
1 stop
Iberia Logo
6:01 pm - 4:00 pm
ORD
-
OPO
15h 59m
2 stops
$654Iberia
Mon, Sep 14 - Wed, Sep 30

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Iberia flights from Porto to Chicago

Our best Iberia deals on Porto to Chicago flight tickets
Iberia
Sep 14
OPO8:40 pmPorto
23h 45m
1 stop
ORD2:25 pmChicago O'Hare Intl
Sep 30
ORD6:01 pmChicago O'Hare Intl
15h 59m
2 stops
OPO4:00 pmPorto
$654
Iberia
Aug 12
OPO8:20 amPorto
13h 40m
1 stop
ORD4:00 pmChicago O'Hare Intl
Aug 15
ORD10:25 pmChicago O'Hare Intl
15h 35m
1 stop
OPO8:00 pmPorto
$3,702

Scandinavian Airlines flights from Porto to Chicago

Our best Scandinavian Airlines deals on Porto to Chicago flight tickets
Scandinavian Airlines
Sep 10
OPO11:50 amPorto
34h 20m
1 stop
ORD4:10 pmChicago O'Hare Intl
Sep 26
ORD7:15 pmChicago O'Hare Intl
15h 50m
1 stop
OPO5:05 pmPorto
$680
Scandinavian Airlines
Sep 10
OPO11:50 amPorto
34h 20m
1 stop
ORD4:10 pmChicago O'Hare Intl
Sep 26
ORD7:15 pmChicago O'Hare Intl
15h 50m
1 stop
OPO5:05 pmPorto
$685
Scandinavian Airlines
Nov 19
OPO5:50 pmPorto
28h 55m
1 stop
ORD4:45 pmChicago O'Hare Intl
Nov 22
ORD7:05 amChicago O'Hare Intl
22h 00m
2 stops
OPO11:05 amPorto
$716

momondo Fare Finder

 
Customize your flight search to find flights from Porto to Chicago that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 1, 2026.
Use the filters below to find and compare flights from Porto to Chicago that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 9/4

8:55 pm-4:05 pm

2 stops25h 10m

Chicago O'Hare Intl

Sun 9/20

6:00 pm-11:50 pm

2 stops23h 50m

$596

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 9/30

7:10 am-12:40 pm

2 stops35h 30m

Chicago O'Hare Intl

Sun 10/11

6:00 pm-11:50 pm

2 stops23h 50m

$604

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 9/16

7:10 am-12:40 pm

2 stops35h 30m

Chicago O'Hare Intl

Wed 9/23

6:00 pm-11:50 pm

2 stops23h 50m

$611

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 9/30

12:15 pm-12:35 pm

1 stop30h 20m

Chicago O'Hare Intl

Sun 10/11

2:20 pm-6:15 pm

1 stop21h 55m

$612

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 9/4

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Sun 9/20

7:05 pm-6:15 pm

1 stop17h 10m

$623

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 8/24

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Mon 9/7

5:00 am-6:55 am

1 stop19h 55m

$630

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 9/14

9:25 pm-3:55 pm

1 stop24h 30m

Chicago O'Hare Intl

Wed 9/30

7:05 pm-7:05 pm

1 stop18h 00m

$638
Quickest round-trip

PortoChicago

OPO - ORD

OPOORD

Porto

Wed 9/23

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Mon 9/28

2:20 pm-11:25 am

1 stop15h 05m

$649

PortoChicago

OPO - ORD

OPOORD

Porto

Fri 9/4

6:00 am-7:55 pm

1 stop19h 55m

Chicago O'Hare Intl

Sun 9/20

3:40 pm-1:45 pm

2 stops16h 05m

$653

PortoChicago

OPO - ORD

OPOORD

Porto

Mon 9/14

8:40 pm-2:25 pm

1 stop23h 45m

Chicago O'Hare Intl

Wed 9/30

6:01 pm-4:00 pm

2 stops15h 59m

$654

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Chicago from

How to get the cheapest flight ticket from Porto to Chicago

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 month to fly to Chicago?

The month of January is, on average, the cheapest month to fly to Chicago from Porto, with most prices found around $590. If you’re not able to fly to Chicago in January, then April is your next best option. Flight prices from Porto to Chicago during April average around $830.

When to book flights from Porto to Chicago

Are you open to changing your travel dates? Check out the ideal times to fly from Porto to Chicago according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Porto to Chicago (OPO to CHI) flight deals and tips

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

Fastest flight time

11h 40m

Direct flights

None
The fastest flight from Porto to Chicago takes 11h 40m
There are no direct flights from Porto to Chicago. There are no popular flight routes from Porto to Chicago.
Search flight deals

Frequently asked questions about flying from Porto to Chicago

  • How far is Porto to Chicago by plane?

    Porto and Chicago are 3927.7 mi apart from one another. By plane, this route typically takes 11h 40m.

  • When did momondo last update prices for flights from Porto Airport to Chicago?

    Prices for flights from Porto Airport to Chicago were last updated today.

  • How old do you have to be to fly from Porto Airport to Chicago?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Porto Airport to Chicago.

  • What documentation or ID do you need to fly to Chicago?

    The travel and health documents you'll need for your trip to Chicago 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 Chicago. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
New Buffalo
Hammond
Portage
Benton Harbor
Lansing
Saint Joseph
Valparaiso
Schererville
Munster
Chesterton
Monticello
Crown Point
Porter
Griffith
Saint John

Why use momondo?

Why should I use momondo to find a flight deal from Porto to Chicago?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from Porto.

Can I find flights from Porto to Chicago with flexible booking policies on momondo?

All flight searches from Porto to Chicago on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Porto to Chicago?

momondo helps you find the best flight between Porto and Chicago by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Porto to Chicago right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Porto to Chicago flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to the United States

Fly into one of these airports located in Chicago

Airports listed have a maximum distance of 78.5 mi from Chicago
Chicago Midway Airport
Chicago O'Hare Intl Airport
Chicago Greater Rockford Airport