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

Return flights

02 Oct - 13 Oct	Spirit Airlines
11 Oct - 19 Oct	Spirit Airlines
01 Oct - 08 Oct	Spirit Airlines
02 Oct - 08 Oct	Spirit Airlines
10 Oct - 17 Oct	WestJet
17 Oct - 25 Oct	Spirit Airlines
18 Oct - 25 Oct	Spirit Airlines
12 Oct - 19 Oct	Air France
11 Oct - 18 Oct	Virgin Atlantic
09 Oct - 17 Oct	Air France

Also check the deals for one-way flights from Houston to Keflavik in October.

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 October from $453

Return flights