Cheapest return flights from Washington to Porto in May from 525€

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

Return flights

26 May - 02 Jun Air Canada
27 May - 03 Jun Air Canada
04 May - 11 May jetBlue
06 May - 13 May jetBlue
05 May - 12 May American Airlines
28 May - 04 Jun Air Canada
01 May - 08 May American Airlines
08 May - 15 May American Airlines
07 May - 14 May United
15 May - 22 May American Airlines
29 May - 05 Jun United
16 May - 23 May American Airlines
30 May - 06 Jun WestJet
31 May - 07 Jun TAP

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

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