Singapore is about 3.3 times bigger than Seattle.

Seattle is approximately 217 sq km, while Singapore is approximately 719 sq km, making Singapore 231% larger than Seattle.
Tip: This to-scale comparison of Seattle vs. Singapore uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.