Cheapest return flights from Washington to Lisbon in May from $632

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

Return flights

05 May - 09 May Scandinavian Airlines
07 May - 11 May Air Canada
03 May - 09 May Scandinavian Airlines
06 May - 12 May Air Canada
24 May - 04 Jun Air Canada
31 May - 15 Jun Air Canada
25 May - 28 May Air Canada
01 May - 08 May Iberia
16 May - 26 May Air Canada
10 May - 25 May Air Canada
26 May - 28 May Air Canada
19 May - 26 May Air Canada
13 May - 04 Jun Air Canada
31 May - 30 Jun British Airways

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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