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

Return flights

05 May - 12 May	jetBlue
06 May - 13 May	jetBlue
04 May - 11 May	jetBlue
07 May - 14 May	jetBlue
03 May - 10 May	jetBlue
02 May - 09 May	jetBlue
23 May - 08 Jun	Air Canada
01 May - 08 May	jetBlue
09 May - 16 May	Air Canada
25 May - 01 Jun	Air Canada
21 May - 26 May	Scandinavian Airlines
10 May - 16 May	TAP
26 May - 02 Jun	jetBlue
29 May - 05 Jun	jetBlue
28 May - 04 Jun	jetBlue
27 May - 03 Jun	jetBlue
30 May - 06 Jun	jetBlue
31 May - 07 Jun	jetBlue
31 May - 15 Jun	jetBlue
22 May - 01 Jun	TAP

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

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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Cheapest return flights from Washington to Lisbon in May from $740

Return flights