AirHint found the following cheapest return flights from Washington (IAD) to Helsinki (HEL) in August 2025 (see full year).

Return flights

21 Aug - 02 Sep	Icelandair
17 Aug - 21 Aug	Icelandair
28 Aug - 04 Sep	Icelandair
21 Aug - 01 Sep	Scandinavian Airlines
27 Aug - 07 Sep	Scandinavian Airlines
10 Aug - 23 Aug	Scandinavian Airlines
21 Aug - 28 Aug	Lufthansa
23 Aug - 30 Aug	Lufthansa
13 Aug - 20 Aug	Lufthansa
17 Aug - 24 Aug	Lufthansa
18 Aug - 25 Aug	Lufthansa
19 Aug - 26 Aug	Lufthansa
24 Aug - 31 Aug	Lufthansa
22 Aug - 29 Aug	Lufthansa

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

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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Cheapest return flights from Washington to Helsinki in August from $424

Return flights