AirHint found the following cheapest return flights from London (STN) to Klagenfurt (KLU) in December 2025 (see full year).

Return flights

01 Dec - 06 Dec	Ryanair	direct
01 Dec - 15 Dec	Ryanair	direct
01 Dec - 13 Dec	Ryanair	direct
06 Dec - 15 Dec	Ryanair	direct
06 Dec - 13 Dec	Ryanair	direct
08 Dec - 13 Dec	Ryanair	direct
08 Dec - 15 Dec	Ryanair	direct
27 Dec - 10 Jan	Ryanair	direct
27 Dec - 12 Jan	Ryanair	direct
15 Dec - 27 Dec	Ryanair	direct
08 Dec - 27 Dec	Ryanair	direct
09 Dec - 13 Dec	Ryanair
29 Dec - 02 Jan	Ryanair

Also check the deals for one-way flights from London to Klagenfurt 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 Klagenfurt in December from 72€

Return flights