Cheapest return flights from Chicago to Porto in September from $568

AirHint found the following cheapest return flights from Chicago (ORD) to Porto (OPO) in September 2026 (see full year).

Return flights

15 Sep - 22 Sep Turkish Airlines
16 Sep - 23 Sep Turkish Airlines
21 Sep - 28 Sep Iberia
02 Sep - 08 Sep Turkish Airlines
01 Sep - 13 Sep Turkish Airlines
02 Sep - 13 Sep Turkish Airlines
18 Sep - 30 Sep Turkish Airlines
20 Sep - 27 Sep Iberia

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

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