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ACH to ONT: distance & flight time
Altenrhein (St Gallen Altenrhein Airport) → Ontario (Ontario International Airport)
5,923 mi
9,532 km · 5,147 nm
12h 5m
estimated nonstop flight time
-9h
time difference · heading northwest
See live ACH→ONT fares Phone-only fares on this route — call free
Flight time details
5,923 miles nonstop takes roughly 12h 5m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 9-hour time set-back when reading arrival times on your ticket.
The two airports
- ACH — St Gallen Altenrhein Airport · Altenrhein, Switzerland
- 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 ACH
- HOH · Hohenems-Dornbirn Airport9 mi away
- FDH · Friedrichshafen Airport13 mi away
- ZRH · Zürich Airport47 mi away
- FMM · Memmingen Allgau Airport47 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 ACH from ONT?
The flight distance from Altenrhein (ACH) to Ontario (ONT) is 5,923 miles (9,532 km, 5,147 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ACH to ONT?
A nonstop flight takes about 12h 5m 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 Altenrhein and Ontario?
Ontario is 9 hours behind Altenrhein.
What is the cheapest way to fly from ACH to ONT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ACH–ONT that never appear on search engines, with no booking fees.