Cheapest return flights from Washington to Lisbon in September from 550€

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

Return flights

30 Sep - 08 Oct ITA Airways
22 Sep - 01 Oct Air Canada
24 Sep - 01 Oct Turkish Airlines
26 Sep - 30 Sep Turkish Airlines
22 Sep - 18 Oct Turkish Airlines
30 Sep - 25 Oct Turkish Airlines
29 Sep - 06 Oct Turkish Airlines
23 Sep - 18 Oct Turkish Airlines
21 Sep - 11 Oct Turkish Airlines
26 Sep - 29 Sep Turkish Airlines
27 Sep - 29 Sep Turkish Airlines
27 Sep - 04 Oct Frontier Airlines
28 Sep - 02 Oct Frontier Airlines
20 Sep - 27 Sep SWISS
17 Sep - 24 Sep SWISS
18 Sep - 25 Sep Brussels Airlines
21 Sep - 28 Sep SWISS
18 Sep - 24 Sep Brussels Airlines
19 Sep - 26 Sep Frontier Airlines
17 Sep - 22 Sep SWISS

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

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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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