Cheapest return flights from Washington to Porto in May from 459€

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

Return flights

05 May - 12 May American Airlines
06 May - 13 May American Airlines
08 May - 15 May American Airlines
07 May - 14 May Iberia
04 May - 11 May Iberia
09 May - 16 May American Airlines
02 May - 09 May Iberia
03 May - 10 May Iberia
20 May - 03 Jun British Airways
19 May - 02 Jun British Airways
20 May - 24 May Delta
14 May - 25 May KLM

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

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