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

Return flights

02 Dec - 09 Dec	KLM
01 Dec - 08 Dec	British Airways
30 Dec - 21 Jan	British Airways
04 Dec - 11 Dec	TAP
25 Dec - 08 Jan	British Airways
15 Dec - 21 Dec	KLM
30 Dec - 21 Jan	Turkish Airlines	direct
01 Dec - 08 Dec	Turkish Airlines	direct
22 Dec - 05 Jan	KLM
18 Dec - 02 Jan	KLM
15 Dec - 21 Dec	Turkish Airlines	direct
23 Dec - 03 Jan	British Airways
25 Dec - 08 Jan	Turkish Airlines	direct
18 Dec - 02 Jan	Turkish Airlines	direct
22 Dec - 05 Jan	Turkish Airlines	direct
23 Dec - 03 Jan	Turkish Airlines	direct

Also check the deals for one-way flights from Boston 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 Boston to Istanbul in December from 447€

Return flights