Cheapest return flights from Washington to Lisbon in May from $568

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

Return flights

01 May - 07 May Royal Air Maroc
04 May - 11 May Royal Air Maroc
06 May - 14 May Iberia
05 May - 12 May Iberia
08 May - 15 May Scandinavian Airlines
02 May - 09 May Scandinavian Airlines
01 May - 08 May Iberia
08 May - 16 May Scandinavian Airlines
18 May - 01 Jun Royal Air Maroc
07 May - 13 May Brussels Airlines
10 May - 18 May Iberia
25 May - 01 Jun Royal Air Maroc
29 May - 04 Jun Royal Air Maroc
25 May - 08 Jun Royal Air Maroc
24 May - 03 Jun Aer Lingus
28 May - 04 Jun Porter Airlines (Canada) Ltd
23 May - 06 Jun Porter Airlines (Canada) Ltd
24 May - 03 Jun TAP direct
27 May - 05 Jun Royal Air Maroc
27 May - 05 Jun TAP direct

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

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