Cheapest return flights from Chicago to Porto in October from $537

Best time to book flights for Chicago (ORD) to Porto (OPO) flights at AirHint

AirHint found the following cheapest return flights from Chicago (ORD) to Porto (OPO) in October 2025 (see full year).

Return flights

20 Oct - 29 Oct United
08 Oct - 15 Oct TAP
22 Oct - 31 Oct TAP
15 Oct - 22 Oct SWISS
14 Oct - 21 Oct Lufthansa
19 Oct - 26 Oct British Airways
13 Oct - 20 Oct Turkish Airlines
12 Oct - 19 Oct Turkish Airlines

Also check the deals for one-way flights from Chicago to Porto in October.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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