AirHint found the following cheapest one-way flights from Washington (IAD) to Singapore (SIN) in May 2026 (see full year).
One-Way flights
| 14 May | Frontier Airlines | ||
| 13 May | Etihad Airways | ||
| 17 May | SWISS | ||
| 22 May | Air Premia | ||
| 29 May | Emirates |
Also check the deals for return flights from Washington to Singapore in May.
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