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

Return flights

11 Sep - 16 Sep	Ryanair
05 Sep - 07 Sep	Ryanair
04 Sep - 07 Sep	Ryanair
19 Sep - 21 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
19 Sep - 22 Sep	Ryanair
17 Sep - 19 Sep	Ryanair
18 Sep - 23 Sep	Ryanair
04 Sep - 08 Sep	Ryanair
05 Sep - 08 Sep	Ryanair
30 Sep - 07 Oct	Ryanair
28 Sep - 06 Oct	Ryanair
25 Sep - 01 Oct	easyJet
29 Sep - 05 Oct	easyJet
27 Sep - 02 Oct	easyJet
29 Sep - 04 Oct	Ryanair
27 Sep - 03 Oct	easyJet
26 Sep - 02 Oct	KLM
26 Sep - 01 Oct	KLM
26 Sep - 01 Oct	Lufthansa	direct

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

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 September from $141

Return flights