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

Return flights

24 Sep - 01 Oct	Wizz Air
29 Sep - 30 Sep	Wizz Air
24 Sep - 30 Sep	Wizz Air
24 Sep - 28 Sep	Ryanair
30 Sep - 02 Oct	Wideroe	direct
25 Sep - 28 Sep	Wideroe	direct
26 Sep - 28 Sep	Ryanair
23 Sep - 30 Sep	Wideroe	direct
27 Sep - 28 Sep	Ryanair
26 Sep - 29 Sep	Wideroe	direct
22 Sep - 29 Sep	Wideroe	direct
24 Sep - 29 Sep	Wideroe	direct

Also check the deals for one-way flights from Sandefjord 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 Sandefjord to Trondheim in September from $140

Return flights