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

Return flights

10 Dec - 11 Jan	Austrian Airlines
31 Dec - 25 Jan	Austrian Airlines
31 Dec - 09 Jan	Austrian Airlines
10 Dec - 07 Jan	Austrian Airlines
26 Dec - 09 Jan	Austrian Airlines
05 Dec - 08 Dec	Vueling Airlines
24 Dec - 12 Jan	Austrian Airlines
24 Dec - 07 Jan	Austrian Airlines
25 Dec - 07 Jan	Lufthansa
15 Dec - 29 Dec	Austrian Airlines
05 Dec - 07 Dec	LOT
17 Dec - 06 Jan	LOT
24 Dec - 28 Dec	Lufthansa
14 Dec - 05 Jan	Austrian Airlines
14 Dec - 29 Dec	Austrian Airlines
15 Dec - 30 Dec	LOT
15 Dec - 31 Dec	LOT
17 Dec - 30 Dec	LOT
14 Dec - 30 Dec	LOT
24 Dec - 30 Dec	LOT

Also check the deals for one-way flights from London to Iasi 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 Iasi in December from $193

Return flights