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Cheap flights from Chicago to Porto from $285

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

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
7:10 pm - 5:00 pmORD-OPO
15h 50m1 stop
TAP AIR PORTUGAL Logo
5:00 am - 2:45 pmOPO-ORD
15h 45m1 stop
$425TAP AIR PORTUGAL
Find Deal
mer., déc. 3 - dim., déc. 14
TAP AIR PORTUGAL Logo
7:10 pm - 1:05 pmORD-OPO
11h 55m1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 2:45 pmOPO-ORD
26h 45m1 stop
$430TAP AIR PORTUGAL
Find Deal
mer., janv. 14 - sam., janv. 24
TAP AIR PORTUGAL Logo
7:10 pm - 6:00 pmORD-OPO
16h 50m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:45 pmOPO-ORD
13h 50m1 stop
$439TAP AIR PORTUGAL
Find Deal
mer., déc. 3 - dim., déc. 7
SWISS Logo
6:50 pm - 6:30 pmORD-OPO
17h 40m1 stop
SWISS Logo
7:25 pm - 4:20 pmOPO-ORD
26h 55m1 stop
$463SWISS
Find Deal
mar., févr. 24 - mar., mars 3
KLM Logo
5:20 pm - 10:30 amORD-OPO
11h 10m1 stop
KLM Logo
4:10 pm - 2:20 pmOPO-ORD
28h 10m1 stop
$477KLM
Find Deal
mar., nov. 25 - mar., déc. 2
Multiple Airlines Logo
3:35 pm - 1:15 pmORD-OPO
15h 40m2 stops
Multiple Airlines Logo
6:00 am - 1:10 pmOPO-ORD
13h 10m1 stop
$478Multiple Airlines
Find Deal
mer., févr. 4 - mer., févr. 11
Multiple Airlines Logo
6:00 pm - 1:15 pmORD-OPO
37h 15m2 stops
Multiple Airlines Logo
12:05 pm - 4:20 pmOPO-ORD
34h 15m1 stop
$480Multiple Airlines
Find Deal
mar., févr. 24 - mar., mars 3
KLM Logo
4:25 pm - 7:20 pmORD-OPO
20h 55m1 stop
KLM Logo
4:10 pm - 2:20 pmOPO-ORD
28h 10m1 stop
$482KLM
Find Deal
mer., nov. 26 - mar., déc. 2
Delta Logo
1:14 pm - 10:30 amMDW-OPO
15h 16m2 stops
Delta Logo
6:30 am - 6:18 pmOPO-MDW
17h 48m2 stops
$547Delta
Find Deal
mer., déc. 3 - lun., déc. 8
Delta Logo
1:14 pm - 10:30 amMDW-OPO
15h 16m2 stops
Delta Logo
5:00 am - 6:18 pmOPO-MDW
19h 18m2 stops
$622Delta
Find Deal
mer., déc. 3 - dim., déc. 7

TAP AIR PORTUGAL flights from Chicago to Porto

Our best TAP AIR PORTUGAL deals on Chicago to Porto flight tickets
TAP AIR PORTUGAL
Dec 3
ORD7:10 pmChicago O'Hare Intl
15h 50m
1 stop
OPO5:00 pmPorto
Dec 14
OPO5:00 amPorto
15h 45m
1 stop
ORD2:45 pmChicago O'Hare Intl
$425
Find similar
TAP AIR PORTUGAL
Jan 14
ORD7:10 pmChicago O'Hare Intl
11h 55m
1 stop
OPO1:05 pmPorto
Jan 24
OPO6:00 pmPorto
26h 45m
1 stop
ORD2:45 pmChicago O'Hare Intl
$430
Find similar
TAP AIR PORTUGAL
Dec 3
ORD7:10 pmChicago O'Hare Intl
16h 50m
1 stop
OPO6:00 pmPorto
Dec 7
OPO6:55 amPorto
13h 50m
1 stop
ORD2:45 pmChicago O'Hare Intl
$439
Find similar

SWISS flights from Chicago to Porto

Our best SWISS deals on Chicago to Porto flight tickets
SWISS
Feb 24
ORD6:50 pmChicago O'Hare Intl
17h 40m
1 stop
OPO6:30 pmPorto
Mar 3
OPO7:25 pmPorto
26h 55m
1 stop
ORD4:20 pmChicago O'Hare Intl
$463
Find similar
SWISS
Feb 12
ORD6:50 pmChicago O'Hare Intl
31h 00m
1 stop
OPO7:50 amPorto
Feb 16
OPO12:05 pmPorto
34h 15m
1 stop
ORD4:20 pmChicago O'Hare Intl
$530
Find similar
SWISS
May 12
ORD2:20 pmChicago O'Hare Intl
17h 25m
2 stops
OPO1:45 pmPorto
May 20
OPO8:40 amPorto
13h 15m
1 stop
ORD3:55 pmChicago O'Hare Intl
$565
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Chicago to Porto 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 novembre 13, 2025.
Use the filters below to find and compare flights from Chicago to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mer. 12/3

7:10 pm-5:00 pm

1 stop15h 50m

Porto

dim. 12/14

5:00 am-2:45 pm

1 stop15h 45m

$425

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mer. 1/14

7:10 pm-1:05 pm

1 stop11h 55m

Porto

sam. 1/24

6:00 pm-2:45 pm

1 stop26h 45m

$430

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mer. 12/3

7:10 pm-6:00 pm

1 stop16h 50m

Porto

dim. 12/7

6:55 am-2:45 pm

1 stop13h 50m

$439

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 2/24

6:50 pm-6:30 pm

1 stop17h 40m

Porto

mar. 3/3

7:25 pm-4:20 pm

1 stop26h 55m

$463

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 11/25

5:20 pm-10:30 am

1 stop11h 10m

Porto

mar. 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$477

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mer. 2/4

3:35 pm-1:15 pm

2 stops15h 40m

Porto

mer. 2/11

6:00 am-1:10 pm

1 stop13h 10m

$478

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mar. 2/24

6:00 pm-1:15 pm

2 stops37h 15m

Porto

mar. 3/3

12:05 pm-4:20 pm

1 stop34h 15m

$480

ChicagoPorto

ORD - OPO

ORDOPO

Chicago O'Hare Intl

mer. 11/26

4:25 pm-7:20 pm

1 stop20h 55m

Porto

mar. 12/2

4:10 pm-2:20 pm

1 stop28h 10m

$482

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mer. 12/3

1:14 pm-10:30 am

2 stops15h 16m

Porto

lun. 12/8

6:30 am-6:18 pm

2 stops17h 48m

$547

ChicagoPorto

MDW - OPO

MDWOPO

Chicago Midway

mer. 12/3

1:14 pm-10:30 am

2 stops15h 16m

Porto

dim. 12/7

5:00 am-6:18 pm

2 stops19h 18m

$622

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 Porto from

How to get the cheapest flight ticket from Chicago to Porto

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 Porto?

The month of April is, on average, the cheapest month to fly to Porto from Chicago, with most prices found around $616. If you aren’t able to travel during the month of April, then book flights to Porto from Chicago during February instead. Flights to Porto in February, while not as cheap as those in April, still average around $628.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Monday when prices can be found for as low as $708. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $808. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the evening is the cheapest time of day to fly from Chicago to Porto when you can find flight prices for as low as $611. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,018 on average. Flights to Porto from Chicago at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $676 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Chicago for as low as $622 on momondo.

When to book flights from Chicago to Porto

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

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

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

Direct flights

None
There are no direct flights from Chicago to Porto. There are no popular flight routes from Chicago to Porto.
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  • How far is Chicago to Porto by plane?

    A flight from Chicago to Porto will travel around 3927.7 mi. By plane, this route typically takes 11h 10m.

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

    Prices for flights from Chicago to Porto Airport refresh daily.

  • How many operators does momondo search for flights from Chicago to Porto Airport?

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Chicago to Porto?

Best airlines flying from Chicago to Porto

Compare and see reviews for airlines that fly from Chicago to Porto with momondo
Airline
Rating
Free Cancellation
Price
TAP AIR PORTUGALPriceFrom $468Free CancellationRating
7.1
2,059 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $487Free CancellationRating
7.0
3,012 reviews
Search Iberia flights
British AirwaysPriceFrom $504Free CancellationRating
6.7
7,521 reviews
Search British Airways flights
LufthansaPriceFrom $526Free CancellationRating
6.8
7,572 reviews
Search Lufthansa flights
KLMPriceFrom $531Free CancellationRating
7.7
1,411 reviews
Search KLM flights
United AirlinesPriceFrom $545Free CancellationRating
7.4
9,017 reviews
Search United Airlines flights
American AirlinesPriceFrom $554Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights
SWISSPriceFrom $558Free CancellationRating
7.5
1,784 reviews
Search SWISS flights
DeltaPriceFrom $638Free CancellationRating
7.9
8,007 reviews
Search Delta flights
Air CanadaPriceFrom $646Free CancellationRating
7.1
10,449 reviews
Search Air Canada flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Aveiro
Matosinhos
Braga
Lamego
Guimarães
Esposende
Chaves
Espinho
Viseu
Ponte de Lima
Arcos de Valdevez
Pinhao
Curia
Penafiel
Mesao Frio
Mira
Baiao

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Chicago to Porto. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo allows you to filter the results for Chicago to Porto flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Porto from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for Chicago to Porto flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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