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

Return flights

19 Sep - 22 Sep	Ryanair
12 Sep - 15 Sep	Ryanair
04 Sep - 09 Sep	Ryanair
05 Sep - 08 Sep	Ryanair
04 Sep - 08 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
19 Sep - 21 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
04 Sep - 31 Oct	Ryanair
30 Sep - 06 Oct	easyJet
01 Sep - 01 Oct	easyJet
18 Sep - 16 Oct	Ryanair
30 Sep - 07 Oct	easyJet
28 Sep - 02 Oct	Ryanair
25 Sep - 01 Oct	Ryanair
27 Sep - 09 Oct	LOT
27 Sep - 01 Oct	Ryanair
27 Sep - 17 Oct	Air France

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 $133

Return flights