AirHint found the following cheapest return flights from Trondheim (TRD) to Istanbul (IST) in July 2025 (see full year).

Return flights

16 Jul - 23 Jul	Scandinavian Airlines
29 Jul - 12 Aug	Norwegian
30 Jul - 11 Aug	Scandinavian Airlines
29 Jul - 13 Aug	Scandinavian Airlines
29 Jul - 11 Aug	Norwegian
28 Jul - 12 Aug	Norwegian
15 Jul - 30 Jul	Scandinavian Airlines
28 Jul - 08 Aug	Norwegian
27 Jul - 12 Aug	Norwegian
14 Jul - 30 Jul	Norwegian
28 Jul - 11 Aug	Norwegian
28 Jul - 13 Aug	Finnair
29 Jul - 10 Aug	Norwegian
15 Jul - 31 Jul	Norwegian
19 Jul - 26 Jul	KLM

Also check the deals for one-way flights from Trondheim to Istanbul in July.

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 Istanbul in July from 399€

Return flights