Need help booking?
Unpublished phone-only deals available
SLU to ONT: distance & flight time
Castries (George F. L. Charles Airport) → Ontario (Ontario International Airport)
3,778 mi
6,081 km · 3,283 nm
7h 53m
estimated nonstop flight time
-3h
time difference · heading northwest
See live SLU→ONT fares Phone-only fares on this route — call free
Flight time details
3,778 miles nonstop takes roughly 7h 53m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 3-hour time set-back when reading arrival times on your ticket.
The two airports
- SLU — George F. L. Charles Airport · Castries, Saint Lucia
- 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 SLU
- UVF · Hewanorra International Airport20 mi away
- FDF · Martinique Aimé Césaire International Airport39 mi away
- SVD · Argyle International Airport61 mi away
- BQU · J F Mitchell Airport74 mi away
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 SLU from ONT?
The flight distance from Castries (SLU) to Ontario (ONT) is 3,778 miles (6,081 km, 3,283 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SLU to ONT?
A nonstop flight takes about 7h 53m 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 Castries and Ontario?
Ontario is 3 hours behind Castries.
What is the cheapest way to fly from SLU to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SLU–ONT that never appear on search engines, with no booking fees.