Cheapest return flights from Oslo to Helsinki in September from $117

AirHint found the following cheapest return flights from Oslo (OSL) to Helsinki (HEL) in September 2025 (see full year).

Return flights

24 Sep - 07 Oct Norwegian direct
23 Sep - 24 Sep Norwegian direct
23 Sep - 07 Oct Norwegian direct
30 Sep - 20 Oct Norwegian direct
30 Sep - 07 Oct Norwegian direct
24 Sep - 08 Oct Norwegian direct
24 Sep - 02 Oct Norwegian direct
30 Sep - 30 Oct Norwegian direct
30 Sep - 02 Oct Norwegian
23 Sep - 30 Sep Norwegian direct
23 Sep - 01 Oct Norwegian direct
30 Sep - 15 Oct Norwegian direct
23 Sep - 29 Sep Norwegian direct
24 Sep - 26 Sep Norwegian direct
24 Sep - 25 Sep Norwegian direct
24 Sep - 24 Sep Norwegian
24 Sep - 28 Sep Norwegian direct
23 Sep - 26 Sep Norwegian direct
22 Sep - 24 Sep airBaltic
29 Sep - 30 Sep Norwegian direct

Also check the deals for one-way flights from Oslo to Helsinki in September.

Skyscanner

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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