London is about 187 times smaller than Arizona.

Arizona is approximately 294,312 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 0.53% the size of Arizona.
Tip: This to-scale comparison of Arizona vs. London 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.