AirHint found the following cheapest return flights from Colombo (CMB) to London (LHR) in December 2025 (see full year).

Return flights

01 Dec - 08 Jan	Air India
15 Dec - 09 Jan	Air India
22 Dec - 11 Jan	Air India
15 Dec - 16 Jan	Air India
17 Dec - 04 Jan	Air India
03 Dec - 04 Jan	Air India
01 Dec - 04 Jan	Air India
17 Dec - 31 Dec	Air India
01 Dec - 03 Dec	Air India
01 Dec - 04 Dec	Air India
04 Dec - 29 Dec	Air India
16 Dec - 04 Jan	Air India
23 Dec - 31 Dec	Air India
07 Dec - 31 Dec	Air India
12 Dec - 30 Jan	Air India
12 Dec - 18 Jan	Air India
21 Dec - 30 Dec	Air India
25 Dec - 29 Dec	Air India
24 Dec - 29 Dec	Air India
19 Dec - 31 Dec	Air India

Also check the deals for one-way flights from Colombo 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Colombo to London in December from $696

Return flights