AirHint found the following cheapest return flights from London (LHR) to Xi'an (XIY) in December 2025 (see full year).

Return flights

06 Dec - 30 Dec	Finnair
11 Dec - 20 Dec	British Airways
12 Dec - 11 Jan	British Airways
12 Dec - 04 Jan	British Airways
26 Dec - 02 Jan	Shenzhen Airlines
24 Dec - 02 Jan	China Southern
29 Dec - 04 Jan	Shenzhen Airlines
26 Dec - 04 Jan	Shenzhen Airlines
07 Dec - 04 Jan	British Airways
05 Dec - 04 Jan	British Airways
14 Dec - 11 Jan	Air China
23 Dec - 01 Jan	British Airways

Also check the deals for one-way flights from London to Xi'an 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 Xi'an in December from $748

Return flights