AirHint found the following cheapest one-way flights from London (LHR) to Copenhagen (CPH) in September 2025 (see full year).

One-Way flights

24 Sep	British Airways	direct
16 Sep	British Airways	direct
23 Sep	British Airways	direct
07 Sep	British Airways	direct
17 Sep	British Airways	direct
03 Sep	British Airways	direct
09 Sep	British Airways	direct
10 Sep	British Airways	direct
14 Sep	British Airways	direct
28 Sep	British Airways	direct

Also check the deals for return flights from London to Copenhagen 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 one-way flights from London to Copenhagen in September from $69

One-Way flights