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

Return flights

30 Aug - 06 Sep	AirAsia
30 Aug - 20 Sep	AirAsia
31 Aug - 04 Sep	AirAsia
30 Aug - 04 Sep	AirAsia
26 Aug - 06 Sep	AirAsia
30 Aug - 11 Sep	AirAsia
25 Aug - 06 Sep	AirAsia
31 Aug - 07 Sep	AirAsia
30 Aug - 10 Sep	AirAsia
24 Aug - 31 Aug	AirAsia
22 Aug - 05 Sep	AirAsia
22 Aug - 29 Aug	AirAsia
23 Aug - 28 Aug	Thai AirAsia
23 Aug - 25 Aug	China Eastern
23 Aug - 30 Aug	AirAsia
26 Aug - 28 Aug	IndiGo
26 Aug - 31 Aug	China Eastern
24 Aug - 25 Aug	China Eastern
27 Aug - 28 Aug	Air India
27 Aug - 27 Aug	Air India

Also check the deals for one-way flights from Colombo to London in August.

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 Colombo to London in August from $801

Return flights