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ONO to SEA: distance & flight time
Ontario (Ontario Municipal Airport) → Seattle (Seattle Tacoma International Airport)
348 mi
560 km · 303 nm
1h 23m
estimated nonstop flight time
-1h
time difference · heading northwest
See live ONO→SEA fares Phone-only fares on this route — call free
Flight time details
348 miles nonstop takes roughly 1h 23m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time set-back when reading arrival times on your ticket.
The two airports
- ONO — Ontario Municipal Airport · Ontario, United States
- SEA — Seattle Tacoma International Airport · Seattle, 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 ONO
- BOI · Boise Air Terminal/Gowen Field50 mi away
- BKE · Baker City Municipal Airport69 mi away
- MYL · McCall Municipal Airport75 mi away
- MUO · Mountain Home Air Force Base88 mi away
Near SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 mi away
Frequently asked questions
How far is ONO from SEA?
The flight distance from Ontario (ONO) to Seattle (SEA) is 348 miles (560 km, 303 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONO to SEA?
A nonstop flight takes about 1h 23m 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 Seattle?
Seattle is 1 hour behind Ontario.
What is the cheapest way to fly from ONO to SEA?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONO–SEA that never appear on search engines, with no booking fees.