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ONT to GRS: distance & flight time
Ontario (Ontario International Airport) → Grosseto (Grosseto Air Base)
6,218 mi
10,007 km · 5,403 nm
12h 40m
estimated nonstop flight time
+9h
time difference · heading northeast
See live ONT→GRS fares Phone-only fares on this route — call free
Flight time details
6,218 miles nonstop takes roughly 12h 40m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 9-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- GRS — Grosseto Air Base · Grosseto, Italy
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 GRS
- SAY · Siena-Ampugnano Airport36 mi away
- EBA · Marina Di Campo Airport42 mi away
- FCO · Leonardo da Vinci–Fiumicino Airport89 mi away
- PSA · Pisa International Airport72 mi away
Frequently asked questions
How far is ONT from GRS?
The flight distance from Ontario (ONT) to Grosseto (GRS) is 6,218 miles (10,007 km, 5,403 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to GRS?
A nonstop flight takes about 12h 40m 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 Grosseto?
Grosseto is 9 hours ahead of Ontario.
What is the cheapest way to fly from ONT to GRS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–GRS that never appear on search engines, with no booking fees.