Oahu is about 1.2 times smaller than Virgin Islands.

Virgin Islands is approximately 1,910 sq km, while Oahu is approximately 1,545 km² (597 sq mi), making Oahu 80.89% the size of Virgin Islands.
Tip: This to-scale comparison of Virgin Islands vs. Oahu 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.