Cheapest return flights from Washington to Lisbon in September from $563

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

24 Sep - 30 Sep Royal Air Maroc
23 Sep - 30 Sep Turkish Airlines
30 Sep - 07 Oct Turkish Airlines
24 Sep - 01 Oct Turkish Airlines
14 Sep - 21 Sep Royal Air Maroc
19 Sep - 29 Sep Royal Air Maroc
14 Sep - 22 Sep Royal Air Maroc
11 Sep - 15 Sep Turkish Airlines
12 Sep - 24 Sep Turkish Airlines
28 Sep - 05 Oct Royal Air Maroc
21 Sep - 28 Sep Royal Air Maroc
22 Sep - 29 Sep Royal Air Maroc
26 Sep - 03 Oct Turkish Airlines
04 Sep - 11 Sep Turkish Airlines
27 Sep - 04 Oct Turkish Airlines
30 Sep - 07 Oct TAP direct
24 Sep - 01 Oct TAP direct
26 Sep - 03 Oct TAP direct
28 Sep - 05 Oct TAP direct
25 Sep - 02 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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