Cheapest return flights from Washington to Lisbon in May from $554

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

Return flights

04 May - 23 May Royal Air Maroc
01 May - 08 May Scandinavian Airlines
03 May - 10 May Scandinavian Airlines
13 May - 17 May Royal Air Maroc
13 May - 04 Jun Royal Air Maroc
10 May - 25 May Royal Air Maroc
17 May - 22 May Scandinavian Airlines
06 May - 12 May Icelandair
03 May - 09 May Royal Air Maroc
05 May - 09 May Scandinavian Airlines
26 May - 28 May Aer Lingus
15 May - 05 Jun Royal Air Maroc
25 May - 01 Jun Royal Air Maroc
31 May - 15 Jun Icelandair
31 May - 30 Jun Icelandair
24 May - 04 Jun Royal Air Maroc
13 May - 04 Jun TAP direct
15 May - 05 Jun TAP direct
31 May - 15 Jun TAP direct
26 May - 02 Jun TAP direct

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

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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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