Cheap Flights from Tri-Cities to Ontario International

Compare Tri-Cities to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Tri-Cities Airport to Ontario International Airport

Looking for a cheap last-minute deal or the best return flight from Tri-Cities Airport to Ontario International Airport? If you want to travel next month, return fares start from ج.م.‏ 20,022. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Tri-Cities to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Tri-Cities to Ontario International flights are currently cheapest in May.

Kingsport to Ontario: Flight information

The things to know before you go.
Cheapest flight foundج.م.‏ 10,109
Cheapest month to flyMay

Finding cheap flights from Tri-Cities to Ontario International: Frequently asked questions

The best price we found for a return flight from Tri-Cities to Ontario International is ج.م.‏ 20,000. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Tri-Cities to Ontario International. But we found flights with one or more stops from ج.م.‏ 20,000.
As of April 2026, there are no flights flying from Tri-Cities to Ontario International.
The cheapest month to fly from Tri-Cities to Ontario International is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Tri-Cities Airport to Ontario International Airport on Sunday, 19 April 2026.
No airlines currently offer direct flights between Tri-Cities Airport and Ontario International Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
Currently, Allegiant Air offers the cheapest flight tickets to Ontario International.

Travelling from Tri-Cities Regional Airport (TRI) to Ontario International Airport (ONT): what you need to know

  • Ontario is three hours behind Kingsport and is in the UTC-7 timezone.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules worth sticking to. Show up at the airport on time to board your TRI to ONT flight.

  • Flying during a peak month like July? School holidays and other popular seasons can mean longer lines at airport checkpoints. Play things extra safe and get there up to four hours before international flights and two hours before a domestic departure.

How to find the cheapest flights from Tri-Cities Regional Airport (TRI) to Ontario International Airport (ONT)

  • The cheapest price we've seen for a one-way Tri-Cities Regional Airport to Ontario International Airport flight is ج.م.‏ 10,109. A return plane ticket is currently ج.م.‏ 20,000. Depending on the availability and when you book, these fares can change.

  • It's usually best to book in advance if you're hoping to get cheap tickets from TRI to ONT. That's because airlines change prices based on demand, which tends to increase closer to the date of departure.

  • The 'Whole month' tool shows you the cheapest flights from Tri-Cities Regional Airport to Ontario International Airport across every month. It's a good way to find a bargain if your trip dates aren't set in stone.

  • Getting your hands on cheap flights from TRI to ONT is a piece of cake with Price Alerts. Simply set up one of these automatic alerts and we'll get in touch when fares go down.

  • Discover the perfect flight for you with the help of the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Tri-Cities Regional Airport to Ontario International Airport, use the 'Sort by' tool. You can also filter results by arrival and departure times, airline, and number of stops.

Handy information about Tri-Cities Regional Airport (TRI)

  • You'll find TRI at 2525 Tennessee 75.

  • When it comes to the on-time performance of Tri-Cities Regional Airport, 79.37% of flights meet their scheduled arrival time.

  • To get to Tri-Cities Regional Airport from central Kingsport, it'll take around 25 minutes if you're going by car. Of course, this depends on traffic. It's approximately 23 kilometres from the airport to the city centre.

  • Get your trip off to a leisurely start by staying near TRI. Whether you're boarding an early flight from Tri-Cities Regional Airport to Ontario International Airport or just don't like being rushed, these hotels are the answer:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport is roughly 6 kilometres from the centre of Ontario. The drive time takes about 10 minutes.

  • It takes around 1 hour 30 minutes to get there using public transport.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from Tri-Cities Regional Airport to Ontario International Airport is May, while August is the busiest. Pick the ideal time to visit Ontario based on whether you prefer a more fast-paced or easygoing experience.

  • The warmest month in Ontario is August, with temperatures ranging between 15ºC and 35ºC. Lock in your flights from Tri-Cities Regional Airport to Ontario International Airport in this month if you like this kind of weather.

  • Search for cheap tickets from TRI to ONT in January if you like travelling in cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC and 23ºC on average.

Explore more of United States

  • You've visited Ontario, now it's time to discover other corners of United States. Travel around 56 kilometres west to Los Angeles to check off its must-visit sights. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, you've got a jam-packed schedule ahead.

  • Around 153 kilometres south of Ontario, San Diego is another essential stop in United States. Start your sightseeing at San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.