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CMI to ONT: distance & flight time
Champaign (University of Illinois Willard Airport) → Ontario (Ontario International Airport)
1,661 mi
2,673 km · 1,443 nm
3h 43m
estimated nonstop flight time
-2h
time difference · heading west
See live CMI→ONT fares Phone-only fares on this route — call free
Flight time details
1,661 miles nonstop takes roughly 3h 43m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time set-back when reading arrival times on your ticket.
The two airports
- CMI — University of Illinois Willard Airport · Champaign, United States
- ONT — Ontario International Airport · Ontario, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near CMI
Near ONT
- CCB · Cable Airport6 mi away
- CNO · Chino Airport6 mi away
- LAX · Los Angeles International Airport47 mi away
- RAL · Riverside Municipal Airport11 mi away
Frequently asked questions
How far is CMI from ONT?
The flight distance from Champaign (CMI) to Ontario (ONT) is 1,661 miles (2,673 km, 1,443 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from CMI to ONT?
A nonstop flight takes about 3h 43m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Champaign and Ontario?
Ontario is 2 hours behind Champaign.
What is the cheapest way to fly from CMI to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on CMI–ONT that never appear on search engines, with no booking fees.