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

Return flights

26 Aug - 09 Sep	Ryanair
28 Aug - 08 Sep	Ryanair
22 Aug - 27 Aug	Ryanair
28 Aug - 03 Sep	Ryanair
31 Aug - 03 Sep	Ryanair
21 Aug - 27 Aug	Ryanair
19 Aug - 26 Aug	Ryanair
26 Aug - 31 Aug	Ryanair
28 Aug - 04 Sep	Ryanair
15 Aug - 20 Aug	Ryanair
27 Aug - 03 Sep	Ryanair
26 Aug - 29 Aug	Ryanair
25 Aug - 31 Aug	Ryanair
24 Aug - 27 Aug	KLM
22 Aug - 25 Aug	KLM
21 Aug - 25 Aug	KLM
25 Aug - 02 Sep	KLM
28 Aug - 01 Sep	KLM
29 Aug - 01 Sep	KLM
30 Aug - 04 Sep	KLM

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 $136

Return flights