Cheapest return flights from Washington to Lisbon in August from $591

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 August 2025 (see full year).

Return flights

17 Aug - 26 Aug Scandinavian Airlines
15 Aug - 29 Aug Scandinavian Airlines
15 Aug - 12 Sep Turkish Airlines
13 Aug - 20 Aug Turkish Airlines
29 Aug - 06 Sep Royal Air Maroc
23 Aug - 07 Sep Royal Air Maroc
06 Aug - 11 Aug Turkish Airlines
13 Aug - 20 Aug TAP direct
08 Aug - 18 Aug Turkish Airlines
17 Aug - 26 Aug TAP direct
15 Aug - 29 Aug TAP direct
15 Aug - 12 Sep TAP direct
18 Aug - 25 Aug TAP direct
28 Aug - 04 Sep TAP direct
23 Aug - 07 Sep TAP direct
08 Aug - 18 Aug TAP direct

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

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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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