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

One-Way flights

03 Sep	Aer Lingus
17 Sep	Aer Lingus
23 Sep	Scandinavian Airlines
25 Sep	Eurowings
22 Sep	Aer Lingus
13 Sep	British Airways
04 Sep	Scandinavian Airlines
14 Sep	Scandinavian Airlines
26 Sep	British Airways
27 Sep	British Airways

Also check the deals for return flights from London to Kaunas 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 Kaunas in September from $111

One-Way flights