Distance Calculator
Chicago, United States → San Antonio, United States
Distance Result
1,051 miles
1,691 km | 913 nautical miles
Straight-line (great circle) distance
The distance from Chicago to San Antonio is about 1,691 km (1,051 miles) as the crow flies, or 913 nautical miles.
This is the great-circle distance — the shortest path over the surface of the Earth, computed with the haversine formula from the coordinates of both cities. Road or rail distance is always longer, and the gap widens with every mountain range or coastline in between.
Putting the number to use
- At a cruising speed near 800 km/h the airborne time is about 2.1 hours; add 30-45 minutes for taxi, climb and descent.
- Time zone difference changes the arrival time on your ticket far more than the flying time does.
- For shipping, use road or sea distance instead — great-circle figures understate real routes.
Driving
≈ 18h 47min
Estimated at 90 km/h average. Actual road distance is typically 15-30% longer than the straight line.
Flying
≈ 2h 44min
Estimated at 850 km/h cruising speed plus takeoff and landing time.
Route Map
Distances from Chicago to Nearby Cities
Frequently Asked Questions
The straight-line (great circle) distance between Chicago and San Antonio is 1,051 miles (1,691 kilometers).
A direct flight from Chicago to San Antonio takes approximately 2h 44min, based on an average cruising speed of 850 km/h plus takeoff and landing time.
Driving from Chicago to San Antonio takes approximately 18h 47min, assuming an average speed of 90 km/h. Actual time depends on the route and traffic.