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ONT to MCS: distance & flight time
Ontario (Ontario International Airport) → Monte Caseros (Monte Caseros Airport)
5,918 mi
9,524 km · 5,142 nm
12h 4m
estimated nonstop flight time
+4h
time difference · heading southeast
See live ONT→MCS fares Phone-only fares on this route — call free
Flight time details
5,918 miles nonstop takes roughly 12h 4m gate to gate, flying southeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 4-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- MCS — Monte Caseros Airport · Monte Caseros, Argentina
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 ONT
- CCB · Cable Airport6 mi away
- CNO · Chino Airport6 mi away
- LAX · Los Angeles International Airport47 mi away
- RAL · Riverside Municipal Airport11 mi away
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
Frequently asked questions
How far is ONT from MCS?
The flight distance from Ontario (ONT) to Monte Caseros (MCS) 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 ONT to MCS?
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 Ontario and Monte Caseros?
Monte Caseros is 4 hours ahead of Ontario.
What is the cheapest way to fly from ONT to MCS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–MCS that never appear on search engines, with no booking fees.