$339 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 5/8. 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, 0 bags

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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Flight Deals

Book Cheap Porto to Illinois Plane Tickets

 
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

Thu, Apr 16 - Sat, May 2
TAP AIR PORTUGAL Logo
10:30 pm - 4:00 pm
OPO
-
ORD
23h 30m
1 stop
TAP AIR PORTUGAL Logo
6:05 pm - 3:00 pm
ORD
-
OPO
14h 55m
1 stop
$613TAP AIR PORTUGAL
Fri, Apr 17 - Wed, Apr 22
TAP AIR PORTUGAL Logo
10:30 pm - 4:05 pm
OPO
-
ORD
23h 35m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 12:40 am
ORD
-
OPO
24h 40m
1 stop
$620TAP AIR PORTUGAL
Fri, Apr 17 - Wed, Apr 22
Multiple Airlines Logo
8:40 pm - 4:05 pm
OPO
-
ORD
25h 25m
2 stops
Multiple Airlines Logo
6:00 pm - 11:50 pm
ORD
-
OPO
23h 50m
2 stops
$662Multiple Airlines
Fri, Apr 17 - Wed, Apr 22
Multiple Airlines Logo
7:35 am - 9:25 pm
OPO
-
ORD
19h 50m
2 stops
Multiple Airlines Logo
7:25 pm - 7:50 am
ORD
-
OPO
30h 25m
3 stops
$699Multiple Airlines
Thu, Jun 4 - Fri, Jun 19
Scandinavian Airlines Logo
11:50 am - 4:10 pm
OPO
-
ORD
34h 20m
1 stop
Scandinavian Airlines Logo
7:15 pm - 7:50 pm
ORD
-
OPO
18h 35m
1 stop
$711Scandinavian Airlines
Wed, Jun 3 - Fri, Jun 19
Scandinavian Airlines Logo
11:50 am - 4:10 pm
OPO
-
ORD
34h 20m
1 stop
Scandinavian Airlines Logo
7:15 pm - 7:50 pm
ORD
-
OPO
18h 35m
1 stop
$751Scandinavian Airlines
Thu, Mar 26 - Mon, Mar 30
Lufthansa Logo
6:00 am - 10:59 pm
OPO
-
STL
21h 59m
2 stops
Lufthansa Logo
11:37 am - 9:45 am
STL
-
OPO
16h 08m
1 stop
$901Lufthansa
Thu, Apr 23 - Thu, Apr 30
United Airlines Logo
6:00 am - 7:22 pm
OPO
-
STL
43h 22m
2 stops
United Airlines Logo
7:45 am - 3:45 pm
STL
-
OPO
26h 00m
2 stops
$904United Airlines
Wed, Mar 25 - Sun, Mar 29
Lufthansa Logo
4:15 pm - 6:00 pm
OPO
-
STL
30h 45m
2 stops
Lufthansa Logo
3:30 pm - 3:40 pm
STL
-
OPO
18h 10m
1 stop
$908Lufthansa
Thu, Mar 26 - Mon, Mar 30
United Airlines Logo
12:35 pm - 5:00 pm
OPO
-
STL
33h 25m
1 stop
United Airlines Logo
6:15 am - 9:45 am
STL
-
OPO
21h 30m
1 stop
$953United Airlines
Booking Insights

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.

How much is a round-trip flight from Porto to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Porto to Illinois departing in April.
Find deals

Good to know

Cheapest flight$339
Most popular time to fly and prices are also 8% lower on average.
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.

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 1471 reviews
7.1Entertainment
7.6Comfort
8.4Crew
7.8Boarding
7.3Food
Airline reviews

It was really nice experience by flying this klm flight.I personally recommend everyone to please try this klm flight

10.0 Excellentsmit, Mar 2026
BLR - AMS
Read more KLM reviews

It was really nice experience by flying this klm flight.I personally recommend everyone to please try this klm flight

It was really nice journey i personally recommend klm flight

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

Crew is not the cheerful type. very slow meal service (this is their style as have flown this many times)

Empty seats next to me - wish it had been for a longer flight!!

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

Flight was on time, staff are friendly and helpful onboard.

Terrible last row seats many seats available but no offer to move to better seat

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

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

Information on your arrival and departure airports

Porto (OPO)