Cheapest return flights from Washington to Lisbon in September from 557€

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