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ONT to TNN: distance & flight time
Ontario (Ontario International Airport) → Tainan (Tainan Airport)
6,967 mi
11,213 km · 6,055 nm
14h 8m
estimated nonstop flight time
+15h
time difference · heading northwest
See live ONT→TNN fares Phone-only fares on this route — call free
Flight time details
6,967 miles nonstop takes roughly 14h 8m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 15-hour time gain when reading arrival times on your ticket.
The two airports
- ONT — Ontario International Airport · Ontario, United States
- TNN — Tainan Airport · Tainan, Taiwan
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 TNN
- PIF · Pingtung North Airport25 mi away
- KHH · Kaohsiung International Airport27 mi away
- CYI · Chiayi Airport37 mi away
- WOT · Wang-an Airport53 mi away
Frequently asked questions
How far is ONT from TNN?
The flight distance from Ontario (ONT) to Tainan (TNN) is 6,967 miles (11,213 km, 6,055 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ONT to TNN?
A nonstop flight takes about 14h 8m 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 TNN?
Nonstop service on ONT–TNN 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 14h 8m nonstop estimate.
What is the time difference between Ontario and Tainan?
Tainan is 15 hours ahead of Ontario.
What is the cheapest way to fly from ONT to TNN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ONT–TNN that never appear on search engines, with no booking fees.
Why are some ONT to TNN fares phone-only?
Consolidator contracts let us sell certain ONT–TNN 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.