Cheapest return flights from Washington to Porto in May from $511

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

Return flights

03 May - 10 May Lufthansa
06 May - 15 May Delta
18 May - 22 May Lufthansa
09 May - 16 May Lufthansa
19 May - 26 May British Airways
19 May - 25 May British Airways
24 May - 31 May TAP
27 May - 03 Jun TAP
25 May - 29 May TAP
22 May - 29 May TAP
23 May - 30 May Lufthansa

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

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