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

Return flights

14 Sep - 17 Sep	Ryanair
15 Sep - 17 Sep	Ryanair
14 Sep - 19 Sep	Ryanair
23 Sep - 30 Sep	Ryanair
11 Sep - 15 Sep	Ryanair
17 Sep - 23 Sep	Ryanair
25 Sep - 03 Oct	Ryanair
04 Sep - 07 Sep	Ryanair
11 Sep - 14 Sep	Ryanair
05 Sep - 08 Sep	Ryanair
04 Sep - 08 Sep	Ryanair
24 Sep - 06 Oct	Ryanair
25 Sep - 06 Oct	Ryanair
25 Sep - 05 Oct	easyJet
21 Sep - 05 Oct	easyJet
27 Sep - 09 Oct	KLM
21 Sep - 04 Oct	KLM
25 Sep - 03 Oct	Lufthansa	direct
25 Sep - 06 Oct	Lufthansa	direct
24 Sep - 06 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 128€

Return flights