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

Return flights

31 Dec - 01 Jan	Ryanair
19 Dec - 03 Jan	Ryanair
10 Dec - 12 Dec	Ryanair
17 Dec - 18 Dec	Ryanair
13 Dec - 14 Dec	TUI
17 Dec - 21 Dec	Ryanair
07 Dec - 14 Dec	Ryanair
18 Dec - 27 Dec	Ryanair

Also check the deals for one-way flights from Cardiff 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 Cardiff to London in December from $181

Return flights