AirHint found the following cheapest return flights from Newark (EWR) to Istanbul (IST) in December 2025 (see full year).

Return flights

02 Dec - 08 Dec	SWISS
09 Dec - 23 Dec	Lufthansa
08 Dec - 14 Dec	SWISS
08 Dec - 22 Dec	Lufthansa
04 Dec - 08 Dec	LOT
12 Dec - 26 Dec	Air Canada
16 Dec - 24 Dec	Lufthansa
08 Dec - 22 Dec	Turkish Airlines	direct
12 Dec - 20 Dec	Lufthansa
02 Dec - 08 Dec	Turkish Airlines	direct
31 Dec - 04 Jan	Air Canada
13 Dec - 03 Jan	TAP
26 Dec - 03 Jan	TAP
31 Dec - 04 Jan	Turkish Airlines	direct
26 Dec - 03 Jan	Turkish Airlines	direct
19 Dec - 02 Jan	Air Canada
19 Dec - 18 Jan	Delta
19 Dec - 03 Jan	Air Canada
13 Dec - 03 Jan	Turkish Airlines	direct
19 Dec - 18 Jan	Turkish Airlines	direct

Also check the deals for one-way flights from Newark to Istanbul 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 Newark to Istanbul in December from $545

Return flights