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

Return flights

05 Dec - 08 Dec	Croatia Airlines	direct
11 Dec - 14 Dec	Austrian Airlines
19 Dec - 21 Dec	LOT
18 Dec - 21 Dec	LOT
09 Dec - 11 Dec	LOT
29 Dec - 01 Jan	Croatia Airlines
19 Dec - 26 Dec	LOT
28 Dec - 04 Jan	Brussels Airlines
19 Dec - 26 Dec	Croatia Airlines	direct
11 Dec - 14 Dec	British Airways	direct
29 Dec - 01 Jan	British Airways	direct
19 Dec - 21 Dec	British Airways	direct
18 Dec - 21 Dec	British Airways	direct
28 Dec - 04 Jan	British Airways	direct

Also check the deals for one-way flights from London to Zagreb 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 Zagreb in December from $189

Return flights