Cheapest return flights from Knoxville to London in December from $732

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

Return flights

14 Dec - 10 Jan United
25 Dec - 08 Jan Allegiant Air
26 Dec - 07 Jan Air Canada
25 Dec - 06 Jan Allegiant Air
24 Dec - 06 Jan Allegiant Air
20 Dec - 27 Dec American Airlines
29 Dec - 06 Jan United

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

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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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