Cheapest return flights from Washington to Porto in March from $453

AirHint found the following cheapest return flights from Washington (IAD) to Porto (OPO) in March 2026 (see full year).

Return flights

03 Mar - 10 Mar Lufthansa
10 Mar - 17 Mar Lufthansa
20 Mar - 27 Mar TAP
05 Mar - 18 Mar TAP
23 Mar - 31 Mar United
23 Mar - 30 Mar Air Canada
22 Mar - 30 Mar SWISS
04 Mar - 11 Mar United
02 Mar - 09 Mar KLM
09 Mar - 16 Mar Air France

Also check the deals for one-way flights from Washington to Porto in March.

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