AirHint found the following cheapest one-way flights from Chicago (ORD) to Singapore (SIN) in December 2025 (see full year).
One-Way flights
| 05 Dec | Spirit Airlines | ||
| 04 Dec | Frontier Airlines | ||
| 30 Dec | Spirit Airlines | ||
| 27 Dec | Spirit Airlines | ||
| 14 Dec | Air India | ||
| 28 Dec | United | ||
| 16 Dec | Delta | ||
| 22 Dec | Delta | ||
| 21 Dec | Delta | ||
| 17 Dec | Air India |
Also check the deals for return flights from Chicago to Singapore in December.
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