AirHint found the following cheapest return flights from Cairns (CNS) to London (LHR) in September 2025 (see full year).

Return flights

07 Sep - 20 Sep	Singapore Airlines
12 Sep - 15 Sep	Singapore Airlines
08 Sep - 15 Sep	Singapore Airlines
15 Sep - 22 Sep	Emirates
22 Sep - 27 Oct	Emirates
15 Sep - 29 Sep	Singapore Airlines
03 Sep - 05 Oct	Emirates

Also check the deals for one-way flights from Cairns to London in September.

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 Cairns to London in September from $1379

Return flights