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275 € Cheap Flights from Ontario International to Knoxville

Compare Ontario International to Knoxville flight deals

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Flight deals from Ontario International Airport to Knoxville Airport

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Knoxville Airport? If you want to travel next month, return fares start from 275 €. Find the lowest prices on one-way and return tickets right here.
Knoxville.275 € per passenger.Departing Sat, 5 Sep, returning Wed, 9 Sep.Return flight with United.Outbound indirect flight with United, departs from Ontario International on Sat, 5 Sep, arriving in Knoxville.Inbound indirect flight with United, departs from Knoxville on Wed, 9 Sep, arriving in Ontario International.Price includes taxes and charges.From 275 €, select.
Knoxville.275 € per passenger.Departing Wed, 1 Apr, returning Mon, 6 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 1 Apr, arriving in Knoxville.Inbound indirect flight with Frontier Airlines, departs from Knoxville on Mon, 6 Apr, arriving in Ontario International.Price includes taxes and charges.From 275 €, select.
Knoxville.289 € per passenger.Departing Fri, 24 Apr, returning Fri, 1 May.Return flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 24 Apr, arriving in Knoxville.Inbound indirect flight with Allegiant Air, departs from Knoxville on Fri, 1 May, arriving in Ontario International.Price includes taxes and charges.From 289 €, select.
Knoxville.320 € per passenger.Departing Mon, 23 Mar, returning Fri, 27 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 23 Mar, arriving in Knoxville.Inbound indirect flight with Frontier Airlines, departs from Knoxville on Fri, 27 Mar, arriving in Ontario International.Price includes taxes and charges.From 320 €, select.
Knoxville.375 € per passenger.Departing Thu, 18 Jun, returning Tue, 23 Jun.Return flight with United.Outbound indirect flight with United, departs from Ontario International on Thu, 18 Jun, arriving in Knoxville.Inbound indirect flight with United, departs from Knoxville on Tue, 23 Jun, arriving in Ontario International.Price includes taxes and charges.From 375 €, select.
Knoxville.453 € per passenger.Departing Thu, 13 Aug, returning Mon, 17 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 13 Aug, arriving in Knoxville.Inbound indirect flight with Southwest Airlines, departs from Knoxville on Mon, 17 Aug, arriving in Ontario International.Price includes taxes and charges.From 453 €, select.
Knoxville.464 € per passenger.Departing Fri, 16 Oct, returning Mon, 19 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 16 Oct, arriving in Knoxville.Inbound indirect flight with Southwest Airlines, departs from Knoxville on Mon, 19 Oct, arriving in Ontario International.Price includes taxes and charges.From 464 €, select.
Knoxville.490 € per passenger.Departing Fri, 29 May, returning Sun, 31 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 29 May, arriving in Knoxville.Inbound indirect flight with Southwest Airlines, departs from Knoxville on Sun, 31 May, arriving in Ontario International.Price includes taxes and charges.From 490 €, select.
Knoxville.534 € per passenger.Departing Wed, 25 Mar, returning Wed, 1 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 25 Mar, arriving in Knoxville.Inbound indirect flight with Southwest Airlines, departs from Knoxville on Wed, 1 Apr, arriving in Ontario International.Price includes taxes and charges.From 534 €, select.
Knoxville.540 € per passenger.Departing Sun, 19 Jul, returning Sat, 1 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 19 Jul, arriving in Knoxville.Inbound indirect flight with Southwest Airlines, departs from Knoxville on Sat, 1 Aug, arriving in Ontario International.Price includes taxes and charges.From 540 €, select.
Knoxville.793 € per passenger.Departing Fri, 26 Jun, returning Mon, 6 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 26 Jun, arriving in Knoxville.Inbound indirect flight with Southwest Airlines, departs from Knoxville on Mon, 6 Jul, arriving in Ontario International.Price includes taxes and charges.From 793 €, select.

Find the cheapest month to fly from Ontario International to Knoxville

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Knoxville flights are currently cheapest in April.
Mar
from 320 €
Apr
from 275 €
May
from 490 €
Jun
from 375 €
Jul
Find prices
Aug
from 453 €
Sep
from 275 €
Oct
from 464 €
Nov
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Dec
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Jan
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Feb
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Ontario International to Knoxville: Alternative routes

Compare routes from Ontario International to Knoxville below. You may find an airport to fly into that's cheaper, faster, or easier than Knoxville.

Knoxville

18km from central Knoxville
ClosestCheapest
from 275 €
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Ontario to Knoxville: Flight information

The things to know before you go.
Cheapest flight found275 €
Cheapest month to flyApril

Finding cheap flights from Ontario International to Knoxville: Frequently asked questions

The best price we found for a return flight from Ontario International to Knoxville is 275 €. 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 Ontario International to Knoxville. But we found flights with one or more stops from 275 €.
As of March 2026, there are no flights flying from Ontario International to Knoxville.
The cheapest month to fly from Ontario International to Knoxville is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Knoxville Airport on Wednesday, 1 April 2026.
No airlines currently offer direct flights between Ontario International Airport and Knoxville 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 Knoxville 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, Frontier Airlines offers the cheapest flight tickets to Knoxville.

Flying from Ontario International Airport (ONT) to McGhee Tyson Airport (TYS): what you need to know

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for stress-free travel. Make sure you're at the airport on time to board your ONT to TYS flight.

  • During popular months like August, it's a good idea to get to the airport well in advance. Plan to arrive two hours before domestic departures and four hours ahead of an international flight whenever you're flying during peak periods in general.

  • Consider adding a stopover when booking your ticket from Ontario International Airport to McGhee Tyson Airport. Simply deselect 'Direct flights only' to break up your journey, or even explore someplace new along the way. Here's where you can stop between ONT and TYS:

    • Phoenix Sky Harbour International Airport

    • Harry Reid Airport (formerly McCarran Airport)

    • Dallas/Fort Worth International Airport

How to find the cheapest flights from Ontario International Airport (ONT) to McGhee Tyson Airport (TYS)

  • 137 € is the best price for a one-way Ontario International Airport to McGhee Tyson Airport flight. A return flight starts at 275 €. These fares may change depending on availability and demand.

  • Don't leave everything to the last moment. You're more likely to get cheap tickets from ONT to TYS if you book early. Airlines often offer some amazing early bird deals.

  • Finding cheap flights from Ontario International Airport to McGhee Tyson Airport is easier if you're flexible with your travel plans. Use the 'Whole month' search function to see the best prices across each month and snap up a great deal.

  • Save time looking for cheap flights from ONT to TYS by creating a Price Alert. You'll get an email or notification through the app when a lower fare becomes available.

  • Tailor your trip with filters. Choose your arrival and departure times, total journey duration and airlines. You can also sort results by 'Cheapest,' 'Fastest' or 'Best' flights from Ontario International Airport to McGhee Tyson Airport.

Handy information about Ontario International Airport (ONT)

  • The address for ONT is 2900 E. Airport Drive.

  • Ontario International Airport gets high marks for on-time performance. 83.6% of flights that depart ONT arrive at their destination on time.

  • Central Ontario to Ontario International Airport is around 6 kilometres. Depending on traffic, it'll take about 10 minutes to get there if you're catching a cab, ride-sharing or driving.

  • You can expect a trip time of around 1 hour 30 minutes when using public transport.

  • Searching for a convenient hotel near ONT? If you're boarding an early flight from Ontario International Airport to McGhee Tyson Airport, these stays will put you moments from your departure lounge:

Arriving at McGhee Tyson Airport (TYS)

  • The last thing you want is a lengthy journey to your hotel if you're arriving on a late Ontario International Airport to McGhee Tyson Airport flight. Book one of these accommodation options near TYS instead:

  • Grab a McGhee Tyson Airport rental car and explore Knoxville and beyond with your own wheels. Budget, Alamo and Avis are leading providers to choose from here.

  • To get the lowest price, reserve your ride from McGhee Tyson Airport about three weeks before you travel.

Getting from McGhee Tyson Airport (TYS) to central Knoxville

  • TYS is located at 2055 Alcoa Highway.

  • From McGhee Tyson Airport, Knoxville is approximately 23 kilometres away. It takes around 20 minutes to reach the centre by car.

When to fly to McGhee Tyson Airport (TYS)

  • It's time to pick your trip dates for your flight from Ontario International Airport to McGhee Tyson Airport. July is the most popular month to head to Knoxville. If you want a quieter vibe, go in February.

  • The warmest month in Knoxville is July, with the temperature ranging between 17ºC (63ºF) and 32ºC (90ºF). Lock in your flights from Ontario International Airport to McGhee Tyson Airport in this month if this is the kind of weather you like.

  • If you'd rather travel in cooler conditions, look for a cheap ticket from ONT to TYS in January. Temperatures average between -6ºC (21ºF) and 11ºC (52ºF) then.

Explore more of United States

  • Columbus is just one of the many places in United States waiting to be explored once you've seen Knoxville. Around 451 kilometres away to the north, well-known attractions include Franklin Park Conservatory and Botanical Gardens, Ohio Statehouse and German Village.

  • Indianapolis is another sought-after destination in United States and is around 467 kilometres north-west of Knoxville. No trip is complete without experiencing The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo.

Plan the rest of your trip from Ontario to Knoxville

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