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

Return flights

30 Sep - 02 Oct	Wizz Air
22 Sep - 25 Sep	Ryanair
22 Sep - 27 Sep	Ryanair
09 Sep - 13 Sep	Wizz Air
20 Sep - 30 Sep	Ryanair
13 Sep - 04 Oct	Ryanair
27 Sep - 04 Oct	Ryanair
29 Sep - 07 Oct	Wizz Air
12 Sep - 04 Oct	Ryanair
28 Sep - 04 Oct	Ryanair
12 Sep - 15 Sep	Wizz Air Malta
11 Sep - 14 Sep	Wizz Air Malta
03 Sep - 11 Sep	Wizz Air
25 Sep - 04 Oct	Ryanair
05 Sep - 14 Sep	Ryanair
17 Sep - 24 Sep	Ryanair
25 Sep - 05 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
24 Sep - 01 Oct	Lufthansa
23 Sep - 26 Sep	Lufthansa

Also check the deals for one-way flights from Sandefjord to Istanbul 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 Istanbul in September from $188

Return flights