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

Return flights

11 Dec - 17 Dec	Spirit Airlines
06 Dec - 27 Dec	Spirit Airlines
09 Dec - 03 Jan	Spirit Airlines
10 Dec - 03 Jan	Spirit Airlines
24 Dec - 01 Jan	Spirit Airlines
21 Dec - 26 Dec	Frontier Airlines
24 Dec - 31 Dec	Spirit Airlines
25 Dec - 31 Dec	Allegiant Air
24 Dec - 03 Jan	Spirit Airlines
23 Dec - 05 Jan	Spirit Airlines
23 Dec - 31 Dec	Spirit Airlines
25 Dec - 03 Jan	Allegiant Air
24 Dec - 02 Jan	Spirit Airlines
20 Dec - 02 Jan	Aer Lingus
23 Dec - 06 Jan	Alaska Airlines

Also check the deals for one-way flights from Indianapolis 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 Indianapolis to London in December from $780

Return flights