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

Return flights

13 Oct - 21 Oct	Air Canada
06 Oct - 21 Oct	Air Canada
28 Oct - 22 Nov	TAP	direct
13 Oct - 22 Oct	Air Canada
27 Oct - 22 Nov	TAP	direct
21 Oct - 04 Nov	TAP	direct
15 Oct - 21 Oct	TAP	direct
31 Oct - 07 Nov	TAP	direct
22 Oct - 04 Nov	TAP	direct
06 Oct - 14 Oct	Lufthansa
26 Oct - 04 Nov	TAP	direct
16 Oct - 21 Oct	Air Canada
12 Oct - 18 Oct	Air Canada
22 Oct - 29 Oct	Air Canada
13 Oct - 18 Oct	Air Canada
13 Oct - 24 Oct	Turkish Airlines
30 Oct - 04 Nov	Turkish Airlines
30 Oct - 06 Nov	Turkish Airlines
21 Oct - 15 Nov	Turkish Airlines
22 Oct - 05 Nov	Turkish Airlines

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 $486

Return flights