AirHint found the following cheapest return flights from Boise (BOI) to London (LGW) in December 2025 (see full year).

Return flights

06 Dec - 13 Dec	Alaska Airlines
05 Dec - 12 Dec	Alaska Airlines
18 Dec - 27 Dec	Frontier Airlines
13 Dec - 20 Dec	Alaska Airlines
22 Dec - 02 Jan	Allegiant Air
21 Dec - 04 Jan	Frontier Airlines
21 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Boise to London 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 Boise to London in December from $1338

Return flights