Cheapest return flights from Washington to Porto in March from 371€

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

Return flights

11 Mar - 18 Mar Air Canada
10 Mar - 17 Mar Air Canada
09 Mar - 16 Mar Air France
16 Mar - 23 Mar Air France
08 Mar - 15 Mar Delta
07 Mar - 14 Mar Delta
12 Mar - 19 Mar KLM
25 Mar - 18 Apr United
26 Mar - 18 Apr United
27 Mar - 18 Apr United
13 Mar - 04 Apr United

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

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