Cheapest return flights from Washington to Lisbon in May from 543€

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

Return flights

05 May - 15 May Turkish Airlines
03 May - 14 May Turkish Airlines
03 May - 13 May Turkish Airlines
04 May - 11 May Turkish Airlines
03 May - 09 May Turkish Airlines
01 May - 06 May Turkish Airlines
10 May - 08 Jun Royal Air Maroc
11 May - 14 May Royal Air Maroc
13 May - 05 Jun Royal Air Maroc
06 May - 11 May Iberia
08 May - 11 May Royal Air Maroc
09 May - 17 May Aer Lingus
28 May - 19 Jun Porter Airlines (Canada) Ltd
15 May - 09 Jun Icelandair
29 May - 08 Jun Porter Airlines (Canada) Ltd
29 May - 04 Jun Icelandair
24 May - 03 Jun Porter Airlines (Canada) Ltd
10 May - 08 Jun TAP direct
28 May - 02 Jun Porter Airlines (Canada) Ltd
29 May - 07 Jun Porter Airlines (Canada) Ltd

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

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