AirHint found the following cheapest return flights from Treviso (TSF) to Keflavik (KEF) in September 2025 (see full year).

Return flights

27 Sep - 01 Oct	Ryanair
29 Sep - 05 Oct	Ryanair
26 Sep - 01 Oct	Wizz Air Malta
24 Sep - 28 Sep	Ryanair
23 Sep - 28 Sep	Ryanair
15 Sep - 28 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
17 Sep - 21 Sep	Ryanair
15 Sep - 21 Sep	Ryanair
09 Sep - 18 Sep	Ryanair
16 Sep - 21 Sep	Ryanair
23 Sep - 27 Sep	Ryanair
26 Sep - 28 Sep	Wizz Air Malta
25 Sep - 04 Oct	Wizz Air Malta
27 Sep - 03 Oct	Ryanair

Also check the deals for one-way flights from Treviso to Keflavik 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 Treviso to Keflavik in September from $238

Return flights