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ONT to KLS: distance & flight time
Ontario (Ontario International Airport) → Kelso (Southwest Washington Regional Airport)
879 mi
1,414 km · 764 nm
2h 23m
estimated nonstop flight time
Same time
time difference · heading north
See live ONT→KLS fares Phone-only fares on this route — call free
Flight time details
879 miles nonstop takes roughly 2h 23m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- KLS — Southwest Washington Regional Airport · Kelso, 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 KLS
- PDX · Portland International Airport39 mi away
- CLS · Chehalis Centralia Airport39 mi away
- HIO · Portland Hillsboro Airport40 mi away
- TTD · Portland Troutdale Airport46 mi away
Frequently asked questions
How far is ONT from KLS?
The flight distance from Ontario (ONT) to Kelso (KLS) is 879 miles (1,414 km, 764 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to KLS?
A nonstop flight takes about 2h 23m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from ONT to KLS?
Nonstop service on ONT–KLS depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 2h 23m nonstop estimate.
What is the cheapest way to fly from ONT to KLS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–KLS that never appear on search engines, with no booking fees.
Why are some ONT to KLS fares phone-only?
Consolidator contracts let us sell certain ONT–KLS tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.