Cheapest return flights from Chicago to Porto in August from 611€

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 August 2025 (see full year).

Return flights

12 Aug - 19 Aug Air Canada
19 Aug - 26 Aug Air Canada
20 Aug - 27 Aug Air Canada
18 Aug - 25 Aug Air Canada
13 Aug - 20 Aug United
25 Aug - 01 Sep Air Canada
27 Aug - 03 Sep Air Canada
26 Aug - 02 Sep SWISS
17 Aug - 24 Aug Air Canada
06 Aug - 13 Aug United
21 Aug - 28 Aug SWISS
14 Aug - 21 Aug SWISS
15 Aug - 22 Aug United
31 Aug - 07 Sep Air Canada
28 Aug - 04 Sep SWISS
28 Aug - 02 Sep United

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

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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