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Cheap Flights from Porto (OPO) to Chicago (CHIA)

Compare Porto to Chicago flight deals

Find the cheapest month or even day of the year to fly to Chicago

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Flight deals from Porto to Chicago

Looking for a cheap last-minute deal or the best return flight from Porto Airport to Chicago? If you want to travel next month, return fares start from $1,222. Find the lowest prices on one-way and return tickets right here.
Chicago.$891 per passenger.Departing Mon, 21 Sep, returning Mon, 28 Sep.Return flight with Ryanair and Iberia.Outbound indirect flight with Ryanair, departs from Porto on Mon, 21 Sep, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Mon, 28 Sep, arriving in Porto.Price includes taxes and charges.From $891, select.
Chicago.$898 per passenger.Departing Mon, 31 Aug, returning Mon, 7 Sep.Return flight with Ryanair and Iberia.Outbound indirect flight with Ryanair, departs from Porto on Mon, 31 Aug, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Mon, 7 Sep, arriving in Porto.Price includes taxes and charges.From $898, select.
Chicago.$905 per passenger.Departing Wed, 28 Oct, returning Mon, 2 Nov.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Porto on Wed, 28 Oct, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Mon, 2 Nov, arriving in Porto.Price includes taxes and charges.From $905, select.
Chicago.$912 per passenger.Departing Tue, 20 Oct, returning Sun, 25 Oct.Return flight with Ryanair and Iberia.Outbound indirect flight with Ryanair, departs from Porto on Tue, 20 Oct, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Sun, 25 Oct, arriving in Porto.Price includes taxes and charges.From $912, select.
Chicago.$929 per passenger.Departing Wed, 30 Sep, returning Sun, 11 Oct.Return flight with Air Europa and Iberia.Outbound indirect flight with Air Europa, departs from Porto on Wed, 30 Sep, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Sun, 11 Oct, arriving in Porto.Price includes taxes and charges.From $929, select.
Chicago.$948 per passenger.Departing Fri, 6 Nov, returning Sat, 14 Nov.Return flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departs from Porto on Fri, 6 Nov, arriving in Chicago O'Hare International.Inbound indirect flight with Scandinavian Airlines, departs from Chicago O'Hare International on Sat, 14 Nov, arriving in Porto.Price includes taxes and charges.From $948, select.
Chicago.$1,134 per passenger.Departing Sun, 29 Nov, returning Sun, 6 Dec.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Porto on Sun, 29 Nov, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Sun, 6 Dec, arriving in Porto.Price includes taxes and charges.From $1,134, select.
Chicago.$1,145 per passenger.Departing Tue, 18 May, returning Sun, 23 May.Return flight with Iberia and British Airways.Outbound indirect flight with Iberia, departs from Porto on Tue, 18 May, arriving in Chicago O'Hare International.Inbound indirect flight with British Airways, departs from Chicago O'Hare International on Sun, 23 May, arriving in Porto.Price includes taxes and charges.From $1,145, select.
Chicago.$1,146 per passenger.Departing Sun, 27 Dec, returning Tue, 5 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from Porto on Sun, 27 Dec, arriving in Chicago O'Hare International.Inbound indirect flight with Delta, departs from Chicago Midway on Tue, 5 Jan, arriving in Porto.Price includes taxes and charges.From $1,146, select.
Chicago.$1,186 per passenger.Departing Fri, 2 Apr, returning Mon, 12 Apr.Return flight with British Airways and Iberia.Outbound indirect flight with British Airways, departs from Porto on Fri, 2 Apr, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Mon, 12 Apr, arriving in Porto.Price includes taxes and charges.From $1,186, select.
Chicago.$1,214 per passenger.Departing Tue, 23 Mar, returning Tue, 30 Mar.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Porto on Tue, 23 Mar, arriving in Chicago O'Hare International.Inbound indirect flight with Iberia, departs from Chicago O'Hare International on Tue, 30 Mar, arriving in Porto.Price includes taxes and charges.From $1,214, select.
Chicago.$1,222 per passenger.Departing Tue, 11 Aug, returning Tue, 18 Aug.Return flight with Air Transat and Air Canada.Outbound indirect flight with Air Transat, departs from Porto on Tue, 11 Aug, arriving in Chicago O'Hare International.Inbound indirect flight with Air Canada, departs from Chicago O'Hare International on Tue, 18 Aug, arriving in Porto.Price includes taxes and charges.From $1,222, select.
Chicago.$1,237 per passenger.Departing Mon, 11 Jan, returning Tue, 19 Jan.Return flight with KLM and Air France.Outbound indirect flight with KLM, departs from Porto on Mon, 11 Jan, arriving in Chicago O'Hare International.Inbound indirect flight with Air France, departs from Chicago Midway on Tue, 19 Jan, arriving in Porto.Price includes taxes and charges.From $1,237, select.
Chicago.$1,369 per passenger.Departing Wed, 29 Jul, returning Wed, 26 Aug.Return flight with Delta.Outbound indirect flight with Delta, departs from Porto on Wed, 29 Jul, arriving in Chicago O'Hare International.Inbound indirect flight with Delta, departs from Chicago O'Hare International on Wed, 26 Aug, arriving in Porto.Price includes taxes and charges.From $1,369, select.
Chicago.$1,369 per passenger.Departing Sun, 19 Jul, returning Wed, 30 Sep.Return flight with KLM and Air France.Outbound indirect flight with KLM, departs from Porto on Sun, 19 Jul, arriving in Chicago O'Hare International.Inbound indirect flight with Air France, departs from Chicago O'Hare International on Wed, 30 Sep, arriving in Porto.Price includes taxes and charges.From $1,369, select.
Chicago.$1,374 per passenger.Departing Tue, 15 Dec, returning Wed, 23 Dec.Return flight with United.Outbound indirect flight with United, departs from Porto on Tue, 15 Dec, arriving in Chicago O'Hare International.Inbound indirect flight with United, departs from Chicago O'Hare International on Wed, 23 Dec, arriving in Porto.Price includes taxes and charges.From $1,374, select.

Find the cheapest month to fly from Porto to Chicago

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Porto to Chicago flights are currently cheapest in September.
Jul
from $1,376
Aug
from $1,222
Sep
from $891
Oct
from $912
Nov
from $948
Dec
from $1,374
Jan
from $1,237
Feb
Find prices
Mar
from $1,214
Apr
from $1,186
May
from $1,145
Jun
from $1,559

Alternative Porto to Chicago routes

Looking for the cheapest, fastest or easiest route from Porto to Chicago? You could fly into the following airports instead.

Chicago Midway

14km from central Chicago
Closest
from $1,154
Search flights

Chicago O'Hare International

25km from central Chicago
Cheapest
from $891
Search flights

Chicago Rockford

127km from central Chicago
Search flights

Porto to Chicago: Flight information

The things to know before you go.
Cheapest flight found$891
Cheapest month to flySeptember

Finding cheap flights from Porto to Chicago: Frequently asked questions

There are 3 airports in Chicago: Chicago Midway, Chicago O'Hare International and Chicago Rockford.
The best price we found for a return flight from Porto to Chicago is $891. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Porto to Chicago. But we found flights with one or more stops from $891.
As of July 2026, there are no flights flying from Porto to Chicago.
The cheapest month to fly from Porto to Chicago is usually September.
If you're flying from Porto Airport, the cheapest airport near Chicago is Chicago O'Hare International – which is 25.5 km away from the centre of Chicago. We've found flights into this airport from $891.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Porto Airport to Chicago on Monday, 21 September 2026.
No airlines currently offer direct flights between Porto Airport and Chicago. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Chicago but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Chicago is around 40 days in advance, so don’t leave your flight to the last minute.

In July, the average temperature is usually around 22°C. July is typically the warmest month in Chicago, when it usually averages around 26°C. You can expect the least rain in January. The coldest month is January, with temperatures averaging -8°C. The rainiest month is August.
Currently, Ryanair offers the cheapest flight tickets to Chicago.

Flying from Porto Airport (OPO) to Chicago: what you need to know

  • The timezone in Chicago is UTC-6. The city is six hours behind Porto, where Porto Airport is located.

  • For a relaxed start to your OPO to Chicago flight, leave enough time to check in and find your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the general travel rule.

  • During popular months such as August, it's a good idea to get to the airport even earlier. Plan to arrive two hours before domestic departures and four hours ahead of international flights whenever you're flying during peak periods in general.

  • Think about adding a stopover to potentially unlock a cheaper plane ticket from OPO to Chicago. All you need to do is uncheck 'Direct flights only' during your search. Break up your journey by stopping at one of these connecting airports:

    • Newark Liberty International Airport (EWR)

    • Adolfo Suarez Madrid-Barajas Airport (MAD)

    • Boston Logan International Airport (BOS)

  • The journey from central Porto to OPO takes around 30 minutes on public transport. If you drive, ride-share or get a taxi, you'll cover the 11 kilometres in 20 minutes or so, depending on traffic.

  • Have an early flight from Porto Airport to Chicago? Avoid the last-minute rush to the terminal (and enjoy a little extra shut-eye) by choosing one of these hotels near OPO:

  • 75% of flights that take off from Porto Airport make it to their destination on schedule.

How to find the cheapest flights from Porto Airport (OPO) to Chicago

  • $635 is the lowest price we've seen for a one-way Porto Airport to Chicago flight. A return plane ticket right now is $891. Depending on the availability when you book, these fares could change.

  • Don't wait until the last minute. You're more likely to pick up cheap flights from OPO to Chicago if you book early. Airlines often offer some great early bird rates.

  • If you have flexibility with your travel dates, try using the 'Whole month' search tool. It'll show you the cheapest price across every month when looking for a Porto Airport to Chicago ticket.

  • There's no need to check back in every day to see if fares have dropped when you set up a Price Alert. We'll update you the moment there's an updated deal for cheap flights from OPO to Chicago.

  • Pick your preferred arrival and departure times, airlines and number of stops with our filters. Then, sort the results for your flight from Porto Airport to Chicago by 'Best,' 'Cheapest' or 'Fastest.'

Airports in Chicago

Chicago O'Hare International Airport (ORD)

  • The distance from Chicago O'Hare International Airport (ORD) to central Chicago is roughly 27 kilometres. It'll take you around 30 minutes to reach the centre driving.

  • If you're taking public transport, expect a journey time of about 45 minutes.

  • If you have a late flight from Porto Airport to Chicago, nothing beats the convenience of staying near the terminal. Grab your bags from the carousel and then be showered and snoozing soon after at one of these hotels near ORD:

  • To lock in the lowest price, reserve your vehicle from Chicago O'Hare International Airport around four weeks ahead of your flight from OPO to Chicago.

  • The street address for ORD is 10000 West O'Hare.

Chicago Midway International Airport (MDW)

  • Chicago Midway International Airport (MDW) is around 16 kilometres from central Chicago. Following your flight from Porto Airport to Chicago, it'll take you around 25 minutes to reach the heart of the city in a taxi or ride-share.

  • If you're catching public transport, it'll take about 30 minutes.

  • You'll find some great places to call home for the night near MDW. Kick back and get cosy after your OPO to Chicago flight at one of these perfectly located options:

  • Avoid paying extra. Booking your ride four weeks before your arrival at MDW will save you money.

  • Chicago Midway International Airport is located at 5700 South Cicero.

Chicago Rockford International Airport (RFD)

  • Step off your flight from Porto Airport to Chicago and head for your hotel or start sightseeing right away. The centre of Chicago is around 145 kilometres from Chicago Rockford International Airport (RFD) and typically takes 1 hour 40 minutes to reach by car.

  • If you're travelling on public transport, the journey takes around 2 hours.

  • If you don't want to make the trip into the centre, find a hotel near RFD. Make yourself comfy at one of these options after your OPO to Chicago flight:

  • Booking a couple of weeks in advance of your flight from Porto Airport to Chicago is a good move. Along with better deals, you'll be able to choose the vehicle make and model you prefer at RFD.

  • Chicago Rockford International Airport's official address is 2 Airport Cir.

Best time to go to Chicago

  • It's time to pick your travel dates for your flight from Porto Airport to Chicago. July is the most popular month to travel to Chicago. If you want a more peaceful vibe, go in January.

  • When booking your Porto Airport to Chicago plane ticket, think about what kind of weather you prefer. July is the warmest month in Chicago, with temperatures ranging from 16ºC (61ºF) to 28ºC (82ºF).

  • If you'd rather travel in cooler conditions, look for a cheap ticket from OPO to Chicago in January when temperatures average between -12ºC (10ºF) and 3ºC (37ºF).

More about Chicago

Explore more of the United States

  • Chicago has its own special appeal, but there are so many other corners of the United States waiting to be explored. About 451 kilometres southeast of Chicago, a visit to Columbus will fill your itinerary to the brim. Check out popular attractions like Franklin Park Conservatory and Botanical Gardens, Whetstone Park / Park of Roses and Ohio Theatre.

  • Around 257 kilometres southeast of Chicago, Indianapolis is another essential stop in the United States. Start your sightseeing at Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis.

Plan smart, explore more

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Plan the rest of your trip from Porto to Chicago

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.