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Route

Ontario → Chicago

ONTOntarioOntario International Airport
ORDChicagoChicago O'Hare International Airport
Distance
1,696 mi
Estimated flight time
~3h 55m

Chicago is currently 2 hours ahead of Ontario.

Observed nonstop

View the reverse route

How often does this route fly?

Frequency

Daily at most

On average around 1 flights a day, observed from October 2025 to September 2026.

1
flights per day
1
busiest month · Oct
3 hr 24 min
measured flight time
11 / 12
months seen

Through the year

Per day, month by month

  1. 1Jan2026
  2. –Feb
  3. 1Mar
  4. 1Apr
  5. 1May
  6. 1Jun
  7. 1Jul
  8. 1Aug
  9. 1Sep
  10. 1Oct2025
  11. 1Nov
  12. 1Dec

In February 2026 we do not see this direction because of limited reception; the opposite direction is seen.

Airlines

Who flies it

United Airlinesall year
UPS Airlinesnow and then

Through the day

Departure times

Local time in Ontario. Most departures between 06:00 and 09:00.

  1. 00:00
  2. 01:00
  3. 02:00
  4. 03:00
  5. 04:00
  6. 05:00
  7. 06:00
  8. 07:00
  9. 08:00
  10. 09:00
  11. 10:00
  12. 11:00
  13. 12:00
  14. 13:00
  15. 14:00
  16. 15:00
  17. 16:00
  18. 17:00
  19. 18:00
  20. 19:00
  21. 20:00
  22. 21:00
  23. 22:00
  24. 23:00

Through the week

By weekday

  1. 0.8Mon
  2. 0.8Tue
  3. 0.8Wed
  4. 0.8Thu
  5. 0.9Fri
  6. 0.8Sat
  7. 0.8Sun

Fleet

Aircraft observed

  1. Boeing 737-800B73840%
  2. Boeing 737-900B73933%
  3. Boeing 737 MAX 8B38M11%
  4. Boeing 737-700B7378%
  5. Boeing 767-300B7634%
All the numbers in a table
MonthPer daySeenAirlines
January 202616
  • United Airlines6×
February 2026We do not see this direction because of limited reception; the opposite direction is seen.
March 2026125
  • United Airlines25×
April 2026128
  • United Airlines28×
May 2026128
  • United Airlines28×
June 2026131
  • United Airlines29×
July 2026128
  • United Airlines28×
August 2026129
  • United Airlines29×
September 2026130
  • United Airlines30×
October 2025131
  • United Airlines31×
November 2025131
  • United Airlines28×
  • UPS Airlines3×
December 2025126
  • UPS Airlines15×
  • United Airlines11×

Airlines observed on this route

From observed callsign routes on ONT-ORD - not a booking guarantee.

United Airlines

UA · UAL

Hub: ORD Chicago

215 departure airportsView airline →

UPS Airlines

5X · UPS

Hub: SDF Louisville

154 departure airportsView airline →

About this route

  • Domestic route: both airports are in the same country.
  • The opposite direction has also been observed as a direct connection.
  • Direct destinations observed from Ontario: 63.
  • Direct destinations observed from Chicago: 259.

The airports on this route

Ontario International Airport

Ontario, United StatesONT / KONT

Major airport · 63 direct destinations · 2 runways · longest runway 12,198 ft

82 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center

Airport pageAll direct destinations

Chicago O'Hare International Airport

Chicago, United StatesORD / KORD

International hub · 259 direct destinations · 8 runways · longest runway 12,999 ft

52 °F · CloudySource: METAR observation via the NOAA Aviation Weather Center

Airport pageAll direct destinations

Alternative airports for this journey

Same journey, a different airport nearby - with an observed direct connection.

ONT MDWChicago Midway International AirportChicago is about 16 mi from Chicago.View route →SNA ORDJohn Wayne Orange County International AirportSanta Ana is about 30 mi from Ontario.View route →LAX ORDLos Angeles International AirportLos Angeles is about 47 mi from Ontario.View route →ONT RFDChicago Rockford International AirportChicago is about 63 mi from Chicago.View route →

About the route from Ontario to Chicago

The observed direct connection between Ontario International Airport (ONT) and Chicago O'Hare International Airport (ORD) covers approximately 1,696 mi. The estimated flight time is around 3h 55m. United Airlines and UPS Airlines have been observed on this connection in the available route data.

Frequently asked questions about this route

How far is Ontario from Chicago by air?
The great-circle distance between Ontario International Airport and Chicago O'Hare International Airport is approximately 1,696 mi.
How long is the flight from Ontario to Chicago?
Based on the distance, the estimated flight time is about 3h 55m. This is an estimate, not a schedule.
Is there a direct connection from Ontario to Chicago?
Yes, a direct connection between ONT and ORD has been observed in our route data.
Which airlines have been observed on this route?
In the available route data: United Airlines and UPS Airlines.
How often is there a flight from Ontario to Chicago?
On average around 1 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 293 observed flights. Mainly United Airlines, UPS Airlines. That is an observation, not a timetable.
What is the current time difference between Ontario and Chicago?
Chicago is currently 2 hours ahead of Ontario.

Where this data comes from

The route data comes from the flight archive (ADS-B, adsb.lol): which connections actually flew over the last twelve full months and who flew them, combined with our own airport, runway, and airline datasets. It is reference data about observed routes - not a current timetable and no claim about bookability.

The frequency and aircraft on this page come from the flight archive (ADS-B, 12 months, October 2025 to September 2026), summarized per route per month. We do not see every flight, so it is a floor, not a count.

Route data updated on October 11, 2026.