$289 Find Cheap Flights from Porto to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to Illinois departing on 10/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to Illinois, as well as popular online travel agencies
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Best Illinois Flight Deals from Porto

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
St. Louis
St. Louis2 stops$764
St. Louis
St. Louis2 stops$764

Cheap Flights from Porto to Illinois

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Porto to Illinois

Fri, Oct 10 - Wed, Oct 15
TAP AIR PORTUGAL Logo
5:55 pm - 4:30 pmOPO-ORD
28h 35m1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 3:00 pmORD-OPO
15h 00m1 stop
$581TAP AIR PORTUGAL
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Mon, Nov 24 - Mon, Dec 1
Iberia Logo
8:45 am - 10:54 pmOPO-ORD
20h 09m2 stops
Iberia Logo
4:45 pm - 11:45 amORD-OPO
13h 00m1 stop
$703Iberia
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Mon, Nov 24 - Mon, Dec 1
KLM Logo
5:00 am - 2:30 pmOPO-ORD
15h 30m1 stop
KLM Logo
5:20 pm - 10:50 amORD-OPO
11h 30m1 stop
$756KLM
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Mon, Nov 24 - Mon, Dec 1
KLM Logo
5:00 am - 2:30 pmOPO-ORD
15h 30m1 stop
KLM Logo
5:20 pm - 10:50 amORD-OPO
11h 30m1 stop
$761KLM
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Thu, Jul 10 - Mon, Jul 14
Logo
6:05 pm - 9:52 amOPO-STL
21h 47m2 stops
Logo
10:47 am - 3:00 pmSTL-OPO
22h 13m3 stops
$764
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Mon, Oct 27 - Mon, Dec 29
United Airlines Logo
6:00 am - 6:39 pmOPO-ORD
41h 39m2 stops
United Airlines Logo
3:20 pm - 2:55 pmORD-OPO
17h 35m1 stop
$767United Airlines
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Mon, Oct 27 - Mon, Dec 29
Delta Logo
5:00 am - 9:46 pmOPO-ORD
21h 46m2 stops
Delta Logo
5:20 pm - 10:50 amORD-OPO
11h 30m1 stop
$770Delta
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Tue, Oct 7 - Tue, Oct 14
United Airlines Logo
6:00 am - 4:53 pmOPO-ORD
16h 53m2 stops
United Airlines Logo
3:05 pm - 11:15 amORD-OPO
14h 10m1 stop
$784United Airlines
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Mon, Oct 27 - Mon, Dec 29
Delta Logo
5:00 am - 9:46 pmOPO-ORD
21h 46m2 stops
Delta Logo
3:18 pm - 3:25 pmORD-OPO
18h 07m2 stops
$785Delta
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Fri, Oct 10 - Mon, Oct 13
Logo
10:20 am - 7:00 pmOPO-ORD
14h 40m1 stop
Logo
9:15 pm - 10:00 pmORD-OPO
18h 45m1 stop
$803
Find Deal
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KAYAK's insights & trends for Porto to Illinois flights

Get data-powered insights and trends into flights from Porto to Illinois to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Porto to Illinois?

The average price of all round-trip flights from Porto to Illinois clicked on KAYAK for each day over the last 12 months.

For Porto to Illinois, Saturday is the cheapest day to fly on average and Friday is the most expensive. Flying from Illinois back to Porto, the best deals are generally found on Friday, with Thursday being the most expensive.

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Good to know

Low seasonMarch
High seasonAugust
Cheapest flight$289
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 33% increase in price.
Flight from Porto to Chicago

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Porto to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Porto to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Porto to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Porto to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Porto to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $817 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $817.

Reviews of the top airline flying from Porto to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Porto to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Porto to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1365 reviews
7.2Food
8.4Crew
7.7Comfort
7.8Boarding
7.1Entertainment
Airline reviews

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

8.0 ExcellentShereen, Apr 2025AMS - YUL
Read more KLM reviews

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

You should not have to pay for WiFi in business class

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

They only had vegetarian food left on the flight which I wasn’t happy about. I didn’t get any food to eat at all.

Overall very poor. Flight was disorganised, staff were rude and this is my second experience with KLM that I've had baggage go missing. It feels like, if you are an economy customer, KLM staff do not show you any care. I shall never fly with KLM again. Worst airline in Europe

Great boarding, great short flight but no entertainment whatsoever. It was supposed to have wifi but that did not work.

Everything you need to know for your flight from Porto to Illinois

Information on your arrival and departure airports

Porto (OPO)

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