Chicago (ORD) to Porto (OPO) cheap flight deal from $499 USD in economy class

AAAmerican Airlines

AYFinnair

O'Hare International Airport

Chicago, United States

OPO

Francisco Sá Carneiro Airport

Porto, Portugal

$851 USD

-41%$499 USD

Verified Sep 21, 2025 at 4:36 PM

October 2025

Today

Mon

Tue

Wed

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Sun

29$739 30$739 1$952 2$799 3$804 4$867 5$807 6$732 7$732 8$832 9$1,013 10$900 11$721 12$657 13$880 14$612 15$612 16$662 17$789 18$610 19$560 20$510 21$499 22$499 23$549 24$549 25$549 26$499 27$499 28$499 29$504 30$622 31$549 1 2

Limited Availability

13% of dates checked are available within 10% of the lowest price

Sunday, October 12th, 2025

10 round-trip options

Returning

Fri, Oct 17, 2025•5 Day Trip

$2,024 USD

Google Flights

Returning

Sat, Oct 18, 2025•6 Day Trip

$1,263 USD

Google Flights

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Sun, Oct 19, 2025•7 Day Trip

$840 USD

Google Flights

Returning

Mon, Oct 20, 2025•8 Day Trip

$657 USD

Google Flights

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Tue, Oct 21, 2025•9 Day Trip

$772 USD

Google Flights

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Wed, Oct 22, 2025•10 Day Trip

$775 USD

Google Flights

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Thu, Oct 23, 2025•11 Day Trip

$657 USD

Google Flights

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Fri, Oct 24, 2025•12 Day Trip

$772 USD

Google Flights

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Sat, Oct 25, 2025•13 Day Trip

$1,017 USD

Google Flights

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Sun, Oct 26, 2025•14 Day Trip

$1,028 USD

Google Flights