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

Return flights

28 Aug - 03 Sep	Ryanair
21 Aug - 03 Sep	Ryanair
24 Aug - 27 Aug	Ryanair
27 Aug - 02 Sep	Ryanair
14 Aug - 20 Aug	Condor
28 Aug - 01 Sep	Ryanair
26 Aug - 30 Aug	Ryanair
22 Aug - 27 Aug	Ryanair
20 Aug - 31 Aug	Ryanair
24 Aug - 30 Aug	Ryanair
28 Aug - 31 Aug	Ryanair
29 Aug - 01 Sep	Ryanair
28 Aug - 30 Aug	Ryanair
13 Aug - 20 Aug	Ryanair
28 Aug - 29 Aug	Ryanair
31 Aug - 07 Sep	Ryanair
30 Aug - 06 Sep	KLM
27 Aug - 01 Sep	Lufthansa	direct
28 Aug - 01 Sep	Lufthansa	direct
29 Aug - 01 Sep	Lufthansa	direct

Also check the deals for one-way flights from Frankfurt 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.

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Cheapest return flights from Frankfurt to Oslo in August from 137€

Return flights