Cheapest return flights from Washington to Porto in May from 521€

Best time to book flights for Washington (IAD) to Porto (OPO) flights at AirHint

AirHint found the following cheapest return flights from Washington (IAD) to Porto (OPO) in May 2025 (see full year).

Return flights

12 May - 19 May Scandinavian Airlines
05 May - 12 May Scandinavian Airlines
07 May - 14 May TAP
13 May - 20 May TAP
28 May - 04 Jun TAP
26 May - 02 Jun TAP
11 May - 18 May TAP
04 May - 19 May TAP
01 May - 08 May TAP
02 May - 09 May TAP
27 May - 03 Jun TAP
08 May - 15 May TAP
04 May - 11 May TAP
31 May - 07 Jun TAP
30 May - 06 Jun TAP

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

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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