AirHint found the following cheapest return flights from Seattle (SEA) to Singapore (SIN) in March 2026 (see full year).
Return flights
| 09 Mar - 16 Mar | United | ||
| 21 Mar - 28 Mar | Singapore Airlines | direct | |
| 28 Mar - 07 Apr | Singapore Airlines | direct | |
| 27 Mar - 06 Apr | Singapore Airlines |
Also check the deals for one-way flights from Seattle to Singapore in March.
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