AirHint found the following cheapest return flights from Seattle (SEA) to Singapore (SIN) in May 2026 (see full year).
Return flights
| 04 May - 08 Jun | Asiana Airlines | ||
| 21 May - 04 Jun | Air Canada | ||
| 21 May - 04 Jun | Singapore Airlines | direct | |
| 01 May - 13 May | United | ||
| 23 May - 13 Jun | United |
Also check the deals for one-way flights from Seattle to Singapore in May.
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