Cheapest return flights from Washington to Lisbon in September from 619€

Best time to book flights for Washington (IAD) to Lisbon (LIS) flights at AirHint

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

Return flights

29 Sep - 06 Oct Turkish Airlines
08 Sep - 14 Sep Scandinavian Airlines
04 Sep - 08 Sep Scandinavian Airlines
16 Sep - 23 Sep Aer Lingus
29 Sep - 06 Oct TAP direct
23 Sep - 30 Sep TAP direct
08 Sep - 14 Sep TAP direct
04 Sep - 08 Sep TAP direct
16 Sep - 23 Sep TAP direct
04 Sep - 13 Sep TAP direct

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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