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

Return flights

19 Aug - 04 Sep	Icelandair
20 Aug - 26 Aug	SWISS
17 Aug - 30 Aug	Air Canada
15 Aug - 30 Aug	Icelandair
12 Aug - 18 Aug	Icelandair
23 Aug - 30 Aug	Scandinavian Airlines
19 Aug - 26 Aug	United
09 Aug - 13 Aug	Icelandair
12 Aug - 22 Aug	Scandinavian Airlines
13 Aug - 23 Aug	Icelandair
21 Aug - 28 Aug	United
25 Aug - 01 Sep	United
28 Aug - 04 Sep	United
30 Aug - 06 Sep	United

Also check the deals for one-way flights from Chicago 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 Chicago to Helsinki in August from 458€

Return flights