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

Return flights

27 Sep - 13 Oct	Brussels Airlines
28 Sep - 01 Oct	British Airways
23 Sep - 29 Sep	British Airways
13 Sep - 17 Sep	British Airways
06 Sep - 08 Sep	British Airways
27 Sep - 30 Sep	Brussels Airlines
30 Sep - 08 Oct	Eurowings
01 Sep - 10 Sep	British Airways
30 Sep - 16 Oct	Eurowings
06 Sep - 13 Sep	British Airways
29 Sep - 06 Oct	Lufthansa
11 Sep - 17 Sep	British Airways
27 Sep - 04 Oct	SWISS
18 Sep - 29 Sep	SWISS
27 Sep - 06 Oct	SWISS
22 Sep - 28 Sep	Brussels Airlines
13 Sep - 28 Sep	British Airways
30 Sep - 06 Oct	Lufthansa
30 Sep - 04 Oct	Lufthansa
17 Sep - 02 Oct	Austrian Airlines

Also check the deals for one-way flights from London to Tbilisi 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 Tbilisi in September from $318

Return flights