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

Return flights

10 Dec - 12 Jan	British Airways
10 Dec - 13 Jan	British Airways
01 Dec - 12 Jan	Allegiant Air
11 Dec - 11 Jan	Allegiant Air
09 Dec - 13 Jan	Lufthansa
01 Dec - 13 Jan	Lufthansa
02 Dec - 25 Dec	Delta
05 Dec - 25 Dec	Delta
06 Dec - 25 Dec	Delta
09 Dec - 11 Jan	Allegiant Air
10 Dec - 11 Jan	British Airways
10 Dec - 25 Dec	Delta
03 Dec - 25 Dec	Allegiant Air
04 Dec - 25 Dec	Allegiant Air
04 Dec - 26 Dec	Allegiant Air
01 Dec - 25 Dec	SWISS
02 Dec - 29 Dec	Allegiant Air
02 Dec - 26 Dec	Allegiant Air

Also check the deals for one-way flights from Knoxville to Budapest 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 Knoxville to Budapest in December from $601

Return flights