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

Return flights

05 Sep - 08 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
18 Sep - 22 Sep	Ryanair
19 Sep - 22 Sep	Ryanair
12 Sep - 15 Sep	Ryanair
14 Sep - 24 Sep	Ryanair
04 Sep - 08 Sep	Ryanair
09 Sep - 17 Sep	Ryanair
11 Sep - 15 Sep	Ryanair
19 Sep - 21 Sep	Ryanair
26 Sep - 28 Oct	Ryanair
14 Sep - 21 Sep	Ryanair
24 Sep - 06 Oct	easyJet
29 Sep - 02 Oct	Ryanair
26 Sep - 08 Oct	Ryanair
26 Sep - 05 Oct	Air France
27 Sep - 05 Oct	Air France
27 Sep - 02 Oct	easyJet
26 Sep - 08 Oct	Lufthansa	direct
22 Sep - 03 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 114€

Return flights