ONT - TYS

$91 Find Cheap Flights from Ontario to Knoxville

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 2/2. 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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Everything you should know

Cheapest round-trip
$210
Overall average: $394
Frontier
Fri 2/6Mon 2/9
ONT - TYS • 1 stop
Cheapest one-way
$91
Typical prices: $394-$551
Frontier
Mon 2/2
ONT - TYS • 1 stop
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 18% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 18% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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

Fri, Feb 6 - Mon, Feb 9
Frontier Logo
6:20 am - 3:30 pm
ONT
-
TYS
6h 10m1 stop
Frontier Logo
4:30 pm - 12:20 am
TYS
-
ONT
10h 50m1 stop
$210Frontier
Mon, Feb 2 - Mon, Feb 9
Frontier Logo
6:20 am - 3:35 pm
ONT
-
TYS
6h 15m1 stop
Frontier Logo
4:30 pm - 12:20 am
TYS
-
ONT
10h 50m1 stop
$220Frontier
Mon, Feb 16 - Fri, Feb 20
Frontier Logo
6:10 am - 7:18 pm
ONT
-
TYS
10h 08m1 stop
Frontier Logo
8:12 pm - 11:59 pm
TYS
-
ONT
6h 47m1 stop
$260Frontier
Fri, Feb 6 - Mon, Feb 9
Frontier Logo
6:20 am - 3:30 pm
ONT
-
TYS
6h 10m1 stop
Frontier Logo
4:30 pm - 12:20 am
TYS
-
ONT
10h 50m1 stop
$270Frontier
Tue, Feb 3 - Tue, Feb 10
Delta Logo
12:41 pm - 11:45 pm
ONT
-
TYS
8h 04m1 stop
Delta Logo
5:40 am - 11:31 am
TYS
-
ONT
8h 51m1 stop
$277Delta
Tue, Feb 10 - Sat, Feb 21
Delta Logo
12:41 pm - 11:45 pm
ONT
-
TYS
8h 04m1 stop
Delta Logo
5:00 pm - 9:05 pm
TYS
-
ONT
7h 05m1 stop
$298Delta
Wed, Jan 28 - Thu, Jan 29
Delta Logo
10:30 pm - 9:21 am
ONT
-
TYS
7h 51m1 stop
Delta Logo
4:06 pm - 9:05 pm
TYS
-
ONT
7h 59m1 stop
$304Delta
Wed, Jan 28 - Thu, Jan 29
American Airlines Logo
9:59 am - 11:59 pm
ONT
-
TYS
11h 00m2 stops
American Airlines Logo
4:41 pm - 10:48 pm
TYS
-
ONT
9h 07m1 stop
$309American Airlines
Fri, Feb 13 - Fri, Feb 20
Frontier Logo
6:00 am - 7:27 pm
ONT
-
TYS
10h 27m1 stop
Frontier Logo
8:12 pm - 11:59 pm
TYS
-
ONT
6h 47m1 stop
$310Frontier
Wed, Jan 28 - Thu, Jan 29
American Airlines Logo
9:59 am - 11:59 pm
ONT
-
TYS
11h 00m2 stops
American Airlines Logo
12:19 pm - 10:13 pm
TYS
-
ONT
12h 54m2 stops
$314American Airlines
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.

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 April, where tickets cost $343 (return) on average. On the other hand, the most expensive months are October and June, where the average cost of round-trip tickets is $509 and $484 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 3 weeks before departure, which saves you about 18% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonDecember
Cheapest flight$91
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly with an average 15% increase in price.
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 3 days, the lowest price for a flight from Ontario to Knoxville was $91 for a one-way ticket and $210 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?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Ontario and Knoxville, with Star Alliance 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 $401 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $516 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.
7.9
DeltaOverall score based on 8019 reviews
8.1Boarding
8.5Crew
7.9Entertainment
7.3Food
7.9Comfort
Airline reviews

The flight was delayed for about 2 hrs. Other than it, it was good.

8.0 ExcellentWen, Dec 2025
LAX - MSY
Read more Delta reviews

The flight was delayed for about 2 hrs. Other than it, it was good.

The plant way delayed departing by 3 hours. It was an old airplane with broken seats and armrests. The bathroom made a hollering sound. A really crappy flight experience and travel day all around.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Premium Plus is a really good idea for longer flights

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

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

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The pilot greased the landing and the crew was fantastic.

delayed due to weather. Could not communicate with family since the wifi was broken

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

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

Information on your arrival and departure airports