Need help booking?
Unpublished phone-only deals available
MCS to ONT: distance & flight time
Monte Caseros (Monte Caseros Airport) → Ontario (Ontario International Airport)
5,918 mi
9,524 km · 5,142 nm
12h 4m
estimated nonstop flight time
-4h
time difference · heading northwest
See live MCS→ONT fares Phone-only fares on this route — call free
Flight time details
5,918 miles nonstop takes roughly 12h 4m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 4-hour time set-back when reading arrival times on your ticket.
The two airports
- MCS — Monte Caseros Airport · Monte Caseros, Argentina
- 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 MCS
- UZU · Curuzu Cuatia Airport40 mi away
- URG · Rubem Berta Airport49 mi away
- AOL · Paso De Los Libres Airport50 mi away
- ATI · Artigas International Airport68 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 MCS from ONT?
The flight distance from Monte Caseros (MCS) to Ontario (ONT) is 5,918 miles (9,524 km, 5,142 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from MCS to ONT?
A nonstop flight takes about 12h 4m 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 Monte Caseros and Ontario?
Ontario is 4 hours behind Monte Caseros.
What is the cheapest way to fly from MCS to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on MCS–ONT that never appear on search engines, with no booking fees.