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

One-Way flights

07 Dec	British Airways
04 Dec	Scandinavian Airlines
05 Dec	Scandinavian Airlines
25 Dec	Scandinavian Airlines
23 Dec	Scandinavian Airlines
24 Dec	Scandinavian Airlines
26 Dec	Eurowings
21 Dec	British Airways
22 Dec	Scandinavian Airlines
19 Dec	Eurowings

Also check the deals for return 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 one-way flights from London to Kaunas in December from $114

One-Way flights