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

Return flights

21 Dec - 21 Jan	Air India
01 Dec - 01 Jan	Air India
18 Dec - 06 Jan	Air India
22 Dec - 02 Jan	Air India
17 Dec - 03 Jan	Air India
22 Dec - 22 Jan	Air India
09 Dec - 29 Dec	Air India
29 Dec - 05 Jan	Air India
17 Dec - 29 Dec	Air India
25 Dec - 09 Jan	Air India
11 Dec - 10 Jan	Air India
18 Dec - 30 Dec	Air India
24 Dec - 30 Dec	Air India
15 Dec - 28 Dec	Air India
19 Dec - 03 Jan	Air India
21 Dec - 28 Dec	Air India
19 Dec - 30 Dec	Air India
21 Dec - 27 Dec	Air India
16 Dec - 25 Dec	Qatar Airways
03 Dec - 24 Dec	Qatar Airways

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 $701

Return flights