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

Return flights

16 Sep - 23 Sep	Aer Lingus
30 Sep - 06 Oct	Aer Lingus
30 Sep - 07 Oct	Aer Lingus
25 Sep - 27 Sep	Brussels Airlines
02 Sep - 09 Sep	Aer Lingus
14 Sep - 16 Sep	British Airways
12 Sep - 16 Sep	Aer Lingus
23 Sep - 25 Sep	Aer Lingus
13 Sep - 20 Sep	British Airways
21 Sep - 23 Sep	Aer Lingus
18 Sep - 22 Sep	British Airways
22 Sep - 25 Sep	British Airways
28 Sep - 03 Oct	Aer Lingus
03 Sep - 02 Oct	Aer Lingus

Also check the deals for one-way flights from London to Bratislava 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 London to Bratislava in September from $250

Return flights