AirHint found the following cheapest return flights from London (LHR) to Kaunas (KUN) in December 2025 (see full year).

Return flights

01 Dec - 04 Dec	Scandinavian Airlines
06 Dec - 09 Dec	British Airways
04 Dec - 07 Dec	Scandinavian Airlines
01 Dec - 05 Dec	Scandinavian Airlines
16 Dec - 24 Dec	Scandinavian Airlines
23 Dec - 26 Dec	Scandinavian Airlines
17 Dec - 28 Dec	Aer Lingus
20 Dec - 26 Dec	Scandinavian Airlines

Also check the deals for one-way flights from London to Kaunas in December.

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 Kaunas in December from $261

Return flights