Cheapest return flights from Washington to Porto in April from $471

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

Return flights

21 Apr - 28 Apr SWISS
12 Apr - 20 Apr TAP
20 Apr - 27 Apr Air France
30 Apr - 06 May Lufthansa
30 Apr - 07 May SWISS
03 Apr - 11 Apr Scandinavian Airlines
10 Apr - 19 Apr Brussels Airlines
24 Apr - 03 May SWISS
03 Apr - 06 Apr Lufthansa

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

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