AirHint found the following cheapest return flights from Boston (BOS) to Kuala Lumpur (KUL) in December 2025 (see full year).
Return flights
| 13 Dec - 18 Dec | Icelandair | ||
| 15 Dec - 04 Jan | Aer Lingus | ||
| 15 Dec - 01 Jan | Aer Lingus | ||
| 25 Dec - 01 Jan | Porter Airlines (Canada) Ltd | ||
| 16 Dec - 03 Jan | Spirit Airlines |
Also check the deals for one-way flights from Boston to Kuala Lumpur in December.
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