Cheapest one-way flights from Chicago to Porto in September from 416€

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

AirHint found the following cheapest one-way flights from Chicago (ORD) to Porto (OPO) in September 2025 (see full year).

One-Way flights

11 Sep Turkish Airlines

Also check the deals for return flights from Chicago to Porto in September.

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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