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

Return flights

28 Aug - 02 Sep	airBaltic
27 Aug - 15 Sep	Norwegian	direct
27 Aug - 28 Aug	airBaltic
25 Aug - 28 Aug	airBaltic
29 Aug - 01 Sep	airBaltic
25 Aug - 01 Sep	airBaltic
26 Aug - 15 Sep	Norwegian	direct
27 Aug - 17 Sep	Norwegian	direct
28 Aug - 15 Sep	Norwegian	direct
28 Aug - 17 Sep	Norwegian	direct
22 Aug - 23 Aug	airBaltic
26 Aug - 08 Sep	Norwegian	direct
26 Aug - 16 Sep	Norwegian	direct
25 Aug - 29 Aug	airBaltic
26 Aug - 26 Aug	Norwegian
20 Aug - 25 Aug	Norwegian
21 Aug - 23 Aug	airBaltic
21 Aug - 24 Aug	airBaltic
23 Aug - 27 Aug	airBaltic
20 Aug - 27 Aug	airBaltic

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

Book a cheap hotel in Oslo

Cheap car rent in Oslo

Cheapest return flights from Helsinki to Oslo in August from 117€

Return flights