California

Distance from Ontario to Rialto

Straight-line distance

13.5mi

Ontario, CA and Rialto, CA are 13.5 miles (21.7 km) apart in a straight line. From Ontario, the shortest path starts out heading ENE (66°).

kilometers
21.7
nautical miles
11.7
heading from Ontario
66° ENE
heading from Rialto
246° WSW
OntarioRialto

Orange line: great-circle path · ring: midpoint

How far Ontario is from Rialto

The great-circle distance between the Census internal points of Ontario and Rialto is 13.5 miles, 21.7 km or 11.7 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 13.5 miles, practically the same at this range.

Measurements

Miles
13.5
Kilometers
21.7
Nautical miles
11.7
Bearing from Ontario
65.8° ENE
Bearing arriving at Rialto
65.9°
Bearing from Rialto
245.9° WSW

Halfway between Ontario and Rialto

The great-circle midpoint is at 34.077547, -117.496851 (34°04'39.17"N 117°29'48.66"W). The nearest incorporated place of 1,000 or more people is Fontana, CA, with 218,455 residents, 2.9 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/Los_Angeles, so there is no time difference. On June 21, Ontario gets 14 h 26 min of daylight and Rialto 14 h 26 min; on December 21, 9 h 53 min and 9 h 53 min. The two sit at nearly the same latitude, so their day lengths match closely all year.

Population compared

Ontario has 1.8 times the population of Rialto. From July 2020 to July 2024, Ontario changed by +5.4% and Rialto by +0.9%. Both are in California.

  1. 01Ontario, CA185,285 (+5.4%)
  2. 02Rialto, CA104,918 (+0.9%)
July 1, 2024 population and change since July 2020, Census Vintage 2024.

Questions people ask

How far is Ontario from Rialto?

13.5 miles, 21.7 km or 11.7 nautical miles along the great circle between the two Census internal points. Road distance is longer.

Which direction is Rialto from Ontario?

ENE. The great-circle path leaves Ontario on a bearing of 65.8° and arrives at Rialto on 65.9°. The return trip starts on 245.9°.

What is halfway between Ontario and Rialto?

The midpoint is at 34.077547, -117.496851. The nearest incorporated place of 1,000+ is Fontana, CA, 2.9 miles from it.

Is there a time difference between Ontario and Rialto?

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

Which is bigger, Ontario or Rialto?

Ontario, with 185,285 residents in July 2024 against 104,918 for Rialto, 1.8 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.