AirHint found the following cheapest return flights from Houston (IAH) to Singapore (SIN) in December 2025 (see full year).
Return flights
| 22 Dec - 07 Jan | United | ||
| 25 Dec - 01 Jan | Frontier Airlines | ||
| 20 Dec - 27 Dec | Frontier Airlines | ||
| 18 Dec - 07 Jan | Frontier Airlines | ||
| 21 Dec - 03 Jan | Spirit Airlines |
Also check the deals for one-way flights from Houston to Singapore in December.
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