Cheapest return flights from Washington to Lisbon in September from 543€

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

Return flights

16 Sep - 23 Sep Turkish Airlines
21 Sep - 30 Oct Turkish Airlines
24 Sep - 01 Oct Turkish Airlines
10 Sep - 20 Sep Turkish Airlines
04 Sep - 12 Sep Turkish Airlines
02 Sep - 08 Sep Aer Lingus
07 Sep - 14 Sep Iberia
10 Sep - 16 Sep Aer Lingus
09 Sep - 16 Sep Iberia
03 Sep - 13 Sep Aer Lingus
16 Sep - 23 Sep TAP direct
01 Sep - 08 Sep TAP direct
21 Sep - 30 Oct TAP direct
24 Sep - 01 Oct TAP direct
26 Sep - 03 Oct 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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