AirHint found the following cheapest return flights from Washington (DCA) to Lisbon (LIS) in October 2025 (see full year).

Return flights

16 Oct - 21 Oct	Air Canada
07 Oct - 14 Oct	jetBlue
12 Oct - 20 Oct	Air Canada
01 Oct - 07 Oct	Air Canada
28 Oct - 04 Nov	jetBlue
16 Oct - 23 Oct	jetBlue
29 Oct - 05 Nov	jetBlue
27 Oct - 03 Nov	jetBlue
14 Oct - 21 Oct	jetBlue
13 Oct - 23 Oct	jetBlue
21 Oct - 28 Oct	jetBlue
20 Oct - 15 Nov	Scandinavian Airlines
01 Oct - 06 Oct	Air Canada
08 Oct - 15 Oct	jetBlue
26 Oct - 02 Nov	jetBlue
31 Oct - 07 Nov	jetBlue
15 Oct - 08 Nov	Iberia
25 Oct - 01 Nov	jetBlue
29 Oct - 08 Nov	United
21 Oct - 15 Nov	jetBlue

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

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 October from $546

Return flights