Cheapest return flights from Washington to Porto in May from 549€

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

Return flights

13 May - 20 May Iberia
05 May - 12 May United
06 May - 13 May American Airlines
12 May - 19 May American Airlines
03 May - 10 May jetBlue
10 May - 17 May jetBlue
11 May - 18 May Iberia
19 May - 26 May American Airlines
20 May - 27 May American Airlines
01 May - 08 May Iberia
25 May - 01 Jun United

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

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