London is about 3.7 times bigger than Aurora.

Aurora (map shows its 53 named neighbourhoods; the area covers the whole city) is approximately 425 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 270% larger than Aurora.
Tip: This to-scale comparison of Aurora 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.