ONT - TYS

$136 Find Cheap Flights from Ontario to Knoxville - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Knoxville departing on 7/15. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Knoxville

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Knoxville, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Knoxville, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$260
Typical prices: $388-$487
Frontier
Wed 7/22Wed 7/29
ONT - TYS • 1 stop
Cheapest one-way
$136
Typical prices: $201-$387
Frontier
Wed 7/15
ONT - TYS • 1 stop
Top airlines
Cheapest • from $260 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Knoxville. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $486 (round-trip)
Shortest trip • 6h 47m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 9 weeks in advance save around 37% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Knoxville!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Knoxville (ONT-TYS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Knoxville that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Knoxville

Wed, Jul 22 - Wed, Jul 29
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
Frontier Logo
8:19 pm - 10:04 am
TYS
-
ONT
16h 45m
1 stop
$260Frontier
Sat, Sep 19 - Thu, Oct 1
Multiple Airlines Logo
2:55 pm - 1:44 pm
ONT
-
TYS
19h 49m
1 stop
Multiple Airlines Logo
6:30 am - 11:55 pm
TYS
-
ONT
20h 25m
1 stop
$278Multiple Airlines
Mon, Jul 27 - Fri, Jul 31
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
$298Frontier
Mon, Jul 27 - Fri, Jul 31
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
$303Frontier
Wed, Jul 22 - Fri, Jul 24
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
$304Frontier
Sat, Sep 19 - Fri, Oct 2
Multiple Airlines Logo
2:55 pm - 1:44 pm
ONT
-
TYS
19h 49m
1 stop
Multiple Airlines Logo
12:57 pm - 1:57 pm
TYS
-
ONT
28h 00m
2 stops
$308Multiple Airlines
Sat, Sep 19 - Thu, Oct 1
Multiple Airlines Logo
2:55 pm - 1:44 pm
ONT
-
TYS
19h 49m
1 stop
Multiple Airlines Logo
12:01 pm - 11:55 pm
TYS
-
ONT
14h 54m
2 stops
$318Multiple Airlines
Sat, Oct 3 - Fri, Oct 9
Multiple Airlines Logo
2:55 pm - 1:11 pm
ONT
-
TYS
19h 16m
1 stop
Multiple Airlines Logo
12:54 pm - 10:43 am
TYS
-
ONT
24h 49m
2 stops
$323Multiple Airlines
Sat, Sep 19 - Mon, Sep 28
Multiple Airlines Logo
2:55 pm - 1:44 pm
ONT
-
TYS
19h 49m
1 stop
Multiple Airlines Logo
6:30 am - 4:10 pm
TYS
-
ONT
12h 40m
1 stop
$327Multiple Airlines
Fri, Jul 17 - Wed, Jul 22
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
$330Frontier
Booking Insights

KAYAK's insights & trends for Ontario to Knoxville flights

Get data-powered insights and trends into flights from Ontario to Knoxville to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ontario to Knoxville?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Knoxville departing in July.

What is the cheapest month to fly from Ontario to Knoxville?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Knoxville, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Knoxville is August, where tickets cost $379 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $564 and $536 respectively.

How far in advance should I book a flight from Ontario to Knoxville?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Knoxville, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Knoxville, you should book around 9 weeks before departure, which saves you about 37% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$136
Best time to beat the crowds but there is an average 10% increase in price.
Most popular time to fly and prices are also 20% lower on average.
Flight from Ontario to Knoxville

When to book flights from Ontario to Knoxville

Are your dates flexible? Find out the best times to travel from Ontario to Knoxville based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Knoxville

  • What is the cheapest flight from Ontario to Knoxville?

    In the last 5 days, the lowest price for a flight from Ontario to Knoxville was $136 for a one-way ticket and $260 for a round-trip.

  • Do I need a passport to fly between Ontario and Knoxville?

    No

  • Which aircraft models fly most regularly from Ontario to Knoxville?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Knoxville?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Ontario and Knoxville, with SkyTeam being the most commonly used for this route.

  • What is the most popular layover when flying to Knoxville from Ontario?

    Dallas is the most popular layover city among KAYAK users traveling from Ontario to Knoxville.

  • Which is the best airline for flights from Ontario to Knoxville, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Knoxville are Delta and United Airlines. With an average price for the route of $400 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $502 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Ontario to Knoxville?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Knoxville.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Knoxville?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Knoxville from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Knoxville?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Knoxville with an airline and back to Ontario with another airline. Booking your flights between Ontario and TYS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Knoxville?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Knoxville from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ontario to Knoxville

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Knoxville. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Knoxville? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
DeltaOverall score based on 8451 reviews
7.2Food
8.5Crew
7.8Comfort
7.8Entertainment
8.1Boarding
Airline reviews

The flights are constantly late anymore, and they won't even give you a glass of water on the plane. For years, they were able to do a service on this flight from Atlanta to Knoxville and Knoxville Atlanta now they say it's too short of a flight. You can't even get a quick drink of water.

4.0 OkayKelli, Jun 2026
ATL - TYS
Read more Delta reviews

The flights are constantly late anymore, and they won't even give you a glass of water on the plane. For years, they were able to do a service on this flight from Atlanta to Knoxville and Knoxville Atlanta now they say it's too short of a flight. You can't even get a quick drink of water.

Should never have had to go to Detroit from Orlando back to Tennessee!

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

Smallest leg room I've ever had on a plane.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Very frustrated with boarding gate crew. She announced the plane was small and they would be limiting us to one item to carry on. Not a problem for me as I understand the tiny planes have limited space!! Not the case here! It was a rather large plane and had plenty of room for bags! So because I don’t want to be one of “those people” who ignores the request to check a carry on I did so asking if I would be able to pick it up at the bottom of the ramp on arrival in Knoxville to which she responded “yes”! Then I watched as every other passenger held onto their 2 items and boarded!! Then when we arrived in Knoxville our 2 carry ons had been put with all the other luggage and we had to go to baggage pick up and wait for all the big checked bags to come off the carousel! So she lied!! Frustrating. Next time I won’t be so nice!

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

They delayed the flight 3 hours because it wasn't full they moved us to 5 different gates probably the worst airline ever not even spirit is this bad.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Poor communication, flight was delayed for preventable reasons. I missed my connection.

We had excellent customer service despite the chaos at George Bush airport in Houston!

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

We boarded but then sat there waiting on some missed connection people to get on so we sat for about 15 minutes for that. Then we sat again because the passenger manifest was wrong and they had to figure it out before we could leave. That took about another 20 minutes or so. The crew was working hard to figure it out so it’s not their fault. It ended up being a system glitch where someone was upgraded to first class while another person was also in the same seat and it just created a mess that took a little while to figure out. They literally went to every person on the plane asking their names to see who was sitting in the wrong seat. I also hate the entertainment that must be watched on your phone or tablet. Just give us setback screens. It’s so much better. Almost every Delta flight has this now and it is so nice to have them. The crew did a great job. I have no complaints from them. They were very hard working, even with the mishap and a disgruntled passenger.

Had a short delay once we boarded the aircraft in Chicago, but it was fixed in no time flat then we were on our way. The pilot was able to make up the time lost and we landed 5 minute later then schedualed . Great service

For some strange reason I was put in zone 5 for boarding even though I had paid premium price for a premium seat right behind business class. This must have been a flaw because everyone else around me in the same zone (row) had been placed in zone 3.

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

Delays experienced in boarding/take off due to incoming plane delayed. However, the boarding time/depart time in the app was significantly delayed in providing these updates. Usually not updated until an hour after we should have already boarded. Poorly managed.

The flight was on time and arrived early. The crew were friendly and helpful.

Plane was delayed for 6 hours, at first by weather, which is understandable, but was further delayed with NO given reason for 2 1/2 hours more. We had no clue when we were going to depart actually until they opened the ramp. VERY POOR to ZERO COMMUNICATION!!!

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

At least it was a short flight. Greyhound with wings.

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

Our flight got changed and/or delayed 8 times before we boarded.

Everything you need to know for your flight from Ontario to Knoxville

Information on your arrival and departure airports