Cheapest return flights from Washington to Lisbon in May from 539€

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

Return flights

18 May - 25 May Iberia
19 May - 26 May Iberia
07 May - 10 May Turkish Airlines
07 May - 10 May TAP direct
04 May - 11 May TAP direct
17 May - 22 May Scandinavian Airlines
14 May - 21 May TAP direct
31 May - 15 Jun Royal Air Maroc
02 May - 19 May Aer Lingus
09 May - 16 May TAP direct
08 May - 22 May British Airways
29 May - 05 Jun TAP direct

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

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