ONT - TYS

$104 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 2/26. 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
$190
Overall average: $343
Frontier
Wed 4/15Sun 4/19
ONT - TYS • 1 stop
Cheapest one-way
$104
Typical prices: $364-$534
Frontier
Thu 2/26
ONT - TYS • 1 stop
Top airlines
Frontier
Cheapest • from $190 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 22% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 20% price drop
June
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, Apr 15 - Sun, Apr 19
Frontier Logo
12:59 am - 3:33 pm
ONT
-
TYS
11h 34m
1 stop
Frontier Logo
4:28 pm - 11:55 pm
TYS
-
ONT
10h 27m
1 stop
$190Frontier
Wed, May 6 - Sun, May 10
Frontier Logo
12:59 am - 3:33 pm
ONT
-
TYS
11h 34m
1 stop
Frontier Logo
4:28 pm - 11:55 pm
TYS
-
ONT
10h 27m
1 stop
$211Frontier
Mon, Mar 23 - Fri, Mar 27
Frontier Logo
6:15 am - 3:25 pm
ONT
-
TYS
6h 10m
1 stop
Frontier Logo
4:20 pm - 11:59 pm
TYS
-
ONT
10h 39m
1 stop
$250Frontier
Mon, Feb 23 - Fri, Feb 27
Frontier Logo
6:10 am - 7:18 pm
ONT
-
TYS
10h 08m
1 stop
Frontier Logo
6:51 pm - 11:59 pm
TYS
-
ONT
8h 08m
1 stop
$276Frontier
Wed, Apr 1 - Wed, Apr 15
Delta Logo
12:57 pm - 11:57 pm
ONT
-
TYS
8h 00m
1 stop
Delta Logo
4:38 pm - 9:00 pm
TYS
-
ONT
7h 22m
1 stop
$319Delta
Tue, Mar 31 - Mon, Apr 6
Multiple Airlines Logo
2:23 pm - 12:45 pm
ONT
-
TYS
19h 22m
2 stops
Multiple Airlines Logo
1:33 pm - 2:26 pm
TYS
-
ONT
27h 53m
1 stop
$321Multiple Airlines
Wed, Mar 11 - Wed, Mar 18
American Airlines Logo
7:59 pm - 8:42 am
ONT
-
TYS
9h 43m
2 stops
American Airlines Logo
6:21 pm - 11:59 pm
TYS
-
ONT
8h 38m
1 stop
$324American Airlines
Wed, Mar 18 - Mon, Mar 23
American Airlines Logo
11:58 pm - 11:30 am
ONT
-
TYS
8h 32m
1 stop
American Airlines Logo
6:21 pm - 10:30 pm
TYS
-
ONT
7h 09m
1 stop
$339American Airlines
Wed, Apr 15 - Sun, Apr 19
Frontier Logo
12:59 am - 3:33 pm
ONT
-
TYS
11h 34m
1 stop
Frontier Logo
4:28 pm - 8:04 pm
TYS
-
ONT
30h 36m
2 stops
$340Frontier
Wed, Mar 18 - Mon, Mar 23
American Airlines Logo
7:59 pm - 8:42 am
ONT
-
TYS
9h 43m
2 stops
American Airlines Logo
6:21 pm - 10:30 pm
TYS
-
ONT
7h 09m
1 stop
$344American 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 January, where the average cost of round-trip tickets is $519 and $516 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 4 weeks before departure, which saves you about 22% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$104
Best time to beat the crowds but there is an average 19% increase in price.
Most popular time to fly with an average 12% 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 $104 for a one-way ticket and $190 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 $378 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 $503 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 8178 reviews
8.5Crew
7.8Entertainment
7.2Food
8.1Boarding
7.9Comfort
Airline reviews

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

10.0 ExcellentDr. Simon, Jan 2026
LAX - JFK
Read more Delta reviews

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

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.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

The flight crew where really good. Better then the crew from BNE to SFO

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

left on time, reasonable boarding process arrived early luggage came out quickly

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

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?

Flight was delayed for 2 hours, then last minute the change to on time. The satélite location is far and a nightmare to get to.

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

For a 5 1/2 hour flite i considered the "business class" to be subpar. The seats were just ok, no amenities, really nothing more than a long domestic flight. Frankly disappointed.

It would be nice to have some low carb options in the snacks.

Flight was smooth, quick and felt safe. The 2 delays not happening would have been better but I guess that happens in the airline industry

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

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

Overall experience was great. Flights were almost on time in departing and we arrived at our destination as scheduled. No issues with amenities or flight crew. Everything went well as as expected. Will fly again with American Airlines in the future!

The pilot greased the landing and the crew was fantastic.

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

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

Information on your arrival and departure airports