Cheapest return flights from Washington to Porto in March from $467

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

Return flights

17 Mar - 24 Mar United
18 Mar - 25 Mar United
05 Mar - 18 Mar TAP
04 Mar - 08 Mar TAP
19 Mar - 26 Mar United
14 Mar - 22 Mar SWISS
08 Mar - 12 Mar Icelandair
20 Mar - 27 Mar SWISS
27 Mar - 06 Apr Turkish Airlines
03 Mar - 06 Mar Aer Lingus

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

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