Cheapest return flights from Washington to Lisbon in September from $635

AirHint found the following cheapest return flights from Washington (IAD) to Lisbon (LIS) in September 2026 (see full year).

Return flights

02 Sep - 10 Sep Iberia
10 Sep - 23 Sep Scandinavian Airlines
09 Sep - 16 Sep Scandinavian Airlines
02 Sep - 09 Sep Iberia
09 Sep - 15 Sep Turkish Airlines
03 Sep - 10 Sep Iberia
04 Sep - 11 Sep Scandinavian Airlines
06 Sep - 13 Sep Iberia
02 Sep - 10 Sep TAP direct
02 Sep - 09 Sep TAP direct

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

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