AirHint found the following cheapest return flights from Washington (DCA) to Singapore (SIN) in May 2026 (see full year).
Return flights
| 01 May - 08 May | Frontier Airlines | ||
| 04 May - 11 May | Frontier Airlines | ||
| 01 May - 11 May | Frontier Airlines | ||
| 28 May - 04 Jun | Air Canada | ||
| 17 May - 23 May | Singapore Airlines | ||
| 22 May - 29 May | Cathay Pacific |
Also check the deals for one-way flights from Washington to Singapore in May.
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