Cheapest one-way flights from Washington to Lisbon in September from $323

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

One-Way flights

14 Sep Icelandair
02 Sep Royal Air Maroc
28 Sep Royal Air Maroc
10 Sep Icelandair
09 Sep Royal Air Maroc
11 Sep Royal Air Maroc
18 Sep Royal Air Maroc
02 Sep TAP direct
28 Sep TAP direct
24 Sep Turkish Airlines

Also check the deals for return 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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