Texas

Distance from Round Rock to San Antonio

Straight-line distance

89.7mi

Round Rock, TX and San Antonio, TX are 89.7 miles (144.4 km) apart in a straight line. From Round Rock, the shortest path starts out heading SW (215°).

kilometers
144.4
nautical miles
78.0
heading from Round Rock
215° SW
heading from San Antonio
35° NE
Round RockSan Antonio

Orange line: great-circle path · ring: midpoint · thin lines: county borders

How far Round Rock is from San Antonio

The great-circle distance between the Census internal points of Round Rock and San Antonio is 89.7 miles, 144.4 km or 78.0 nautical miles. That is the shortest path over the Earth's surface, computed with the haversine formula on a sphere with the mean Earth radius, 6,371.0 km. A course held on one compass bearing (a rhumb line) would be 89.7 miles, practically the same at this range.

Measurements

Miles
89.7
Kilometers
144.4
Nautical miles
78.0
Bearing from Round Rock
215.3° SW
Bearing arriving at San Antonio
214.8°
Bearing from San Antonio
34.8° NE

Halfway between Round Rock and San Antonio

The great-circle midpoint is at 29.995150, -98.096356 (29°59'42.54"N 98°05'46.88"W). The nearest incorporated place of 1,000 or more people is Wimberley, TX, with 2,889 residents, 0.8 miles from the midpoint. To find towns near the midpoint of any two places, use the halfway tool.

Time zones and daylight

Both use America/Chicago, so there is no time difference. On June 21, Round Rock gets 14 h 07 min of daylight and San Antonio 14 h 02 min; on December 21, 10 h 10 min and 10 h 15 min. Round Rock is 1.06° farther north, so it has the longer summer days and the shorter winter ones.

Population compared

San Antonio has 11.3 times the population of Round Rock. From July 2020 to July 2024, Round Rock changed by +12.3% and San Antonio by +6.1%. Both are in Texas.

  1. 01Round Rock, TX135,359 (+12.3%)
  2. 02San Antonio, TX1,526,656 (+6.1%)
July 1, 2024 population and change since July 2020, Census Vintage 2024.

Questions people ask

How far is Round Rock from San Antonio?

89.7 miles, 144.4 km or 78.0 nautical miles along the great circle between the two Census internal points. Road distance is longer.

Which direction is San Antonio from Round Rock?

SW. The great-circle path leaves Round Rock on a bearing of 215.3° and arrives at San Antonio on 214.8°. The return trip starts on 34.8°.

What is halfway between Round Rock and San Antonio?

The midpoint is at 29.995150, -98.096356. The nearest incorporated place of 1,000+ is Wimberley, TX, 0.8 miles from it.

Is there a time difference between Round Rock and San Antonio?

Both use America/Chicago, so there is no time difference.

Which is bigger, Round Rock or San Antonio?

San Antonio, with 1,526,656 residents in July 2024 against 135,359 for Round Rock, 11.3 times as many.

Sources and data as of

Data as of: Census 2024 Gazetteer internal points and Vintage 2024 estimates; time zones from Open-Meteo.

  1. 01Census 2024 Gazetteer, places
  2. 02Census Vintage 2024 subcounty population estimates
  3. 03SunCalc library (Vladimir Agafonkin), algorithms after Jean Meeus
  4. 04IANA time zone database (clock times and daylight saving rules)

How every number is computed: methodology. Spotted a wrong figure? Report an error.