AirHint found the following cheapest return flights from Houston (HOU) to Keflavik (KEF) in December 2025 (see full year).

Return flights

05 Dec - 12 Dec	Spirit Airlines
04 Dec - 11 Dec	Spirit Airlines
06 Dec - 13 Dec	Spirit Airlines
03 Dec - 10 Dec	Spirit Airlines
07 Dec - 14 Dec	Spirit Airlines
08 Dec - 15 Dec	Spirit Airlines
09 Dec - 16 Dec	Spirit Airlines
02 Dec - 09 Dec	Spirit Airlines
01 Dec - 08 Dec	Spirit Airlines
13 Dec - 20 Dec	Spirit Airlines
27 Dec - 03 Jan	jetBlue
30 Dec - 06 Jan	British Airways
31 Dec - 07 Jan	British Airways
29 Dec - 05 Jan	Lufthansa
25 Dec - 01 Jan	Spirit Airlines
28 Dec - 04 Jan	Spirit Airlines
26 Dec - 02 Jan	Spirit Airlines

Also check the deals for one-way flights from Houston 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 Houston to Keflavik in December from 337€

Return flights