AirHint found the following cheapest return flights from Rome (ROM) to Trondheim (TRD) in September 2025 (see full year).

Return flights

25 Sep - 28 Sep	Norwegian
06 Sep - 14 Sep	Scandinavian Airlines
30 Sep - 05 Oct	Ryanair
10 Sep - 15 Sep	KLM
03 Sep - 06 Sep	Wizz Air
28 Sep - 01 Oct	Vueling Airlines
26 Sep - 28 Sep	KLM
24 Sep - 27 Sep	KLM

Also check the deals for one-way flights from Rome to Trondheim 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 Rome to Trondheim in September from $225

Return flights