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ONT to FSI: distance & flight time
Ontario (Ontario International Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
1,094 mi
1,761 km · 951 nm
2h 51m
estimated nonstop flight time
+2h
time difference · heading east
See live ONT→FSI fares Phone-only fares on this route — call free
Flight time details
1,094 miles nonstop takes roughly 2h 51m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, 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 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 FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 mi away
Frequently asked questions
How far is ONT from FSI?
The flight distance from Ontario (ONT) to Fort Sill (FSI) is 1,094 miles (1,761 km, 951 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to FSI?
A nonstop flight takes about 2h 51m 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 Fort Sill?
Fort Sill is 2 hours ahead of Ontario.
What is the cheapest way to fly from ONT to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–FSI that never appear on search engines, with no booking fees.