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

Return flights

15 Oct - 22 Oct	Air Canada
22 Oct - 02 Nov	jetBlue
07 Oct - 14 Oct	Air Canada
02 Oct - 08 Oct	Air Canada
23 Oct - 04 Nov	United
30 Oct - 10 Nov	Air Canada
09 Oct - 16 Oct	Air Canada
30 Oct - 07 Nov	British Airways
08 Oct - 12 Oct	KLM
08 Oct - 13 Oct	KLM
06 Oct - 20 Oct	Delta
10 Oct - 17 Oct	Air Canada
11 Oct - 17 Oct	Air Canada
03 Oct - 13 Oct	Air Canada

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 $500

Return flights