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

Return flights

08 Sep - 15 Sep	Norwegian
09 Sep - 16 Sep	Wizz Air
12 Sep - 15 Sep	LOT
26 Sep - 29 Sep	Scandinavian Airlines
11 Sep - 15 Sep	Norwegian
11 Sep - 16 Sep	Wizz Air
10 Sep - 16 Sep	Norwegian
19 Sep - 23 Sep	Scandinavian Airlines
11 Sep - 13 Sep	Wizz Air
21 Sep - 25 Sep	Scandinavian Airlines
22 Sep - 03 Oct	Norwegian
22 Sep - 01 Oct	Norwegian
22 Sep - 02 Oct	Norwegian
15 Sep - 03 Oct	Norwegian
15 Sep - 01 Oct	Norwegian
15 Sep - 02 Oct	Norwegian
22 Sep - 13 Oct	Norwegian
19 Sep - 03 Oct	Norwegian
19 Sep - 01 Oct	Norwegian
23 Sep - 03 Oct	Norwegian

Also check the deals for one-way flights from Trondheim to Copenhagen 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 Trondheim to Copenhagen in September from $158

Return flights