AirHint found the following cheapest return flights from Salt Lake City (SLC) to Keflavik (KEF) in December 2025 (see full year).

Return flights

06 Dec - 12 Dec	Frontier Airlines
15 Dec - 10 Jan	Frontier Airlines
16 Dec - 10 Jan	Frontier Airlines
22 Dec - 17 Jan	Frontier Airlines
19 Dec - 10 Jan	Southwest Airlines
11 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Salt Lake City to Keflavik in December.

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 Salt Lake City to Keflavik in December from 601€

Return flights