Size comparison

compared to

O'Hare Airport is about 4.4 times smaller than San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while O'Hare Airport is approximately 27 km² (11 sq mi), making O'Hare Airport 22.63% the size of San Francisco.
Tip: This to-scale comparison of San Francisco vs. O'Hare Airport uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: O'Hare Airport vs. San Francisco

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See O'Hare Airport on top of San Francisco
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