TYS - ONT

$137 Find Cheap Flights from Knoxville to Ontario - 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 Knoxville to Ontario departing on 8/24. 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 Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Knoxville to Ontario, 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 Knoxville to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$260
Typical prices: $348-$578
Frontier
Wed 8/5Mon 8/10
TYS - ONT • 1 stop
Cheapest one-way
$137
Typical prices: $228-$349
Multiple Airlines
Mon 8/24
TYS - ONT • 2 stops
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 Knoxville and Ontario. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $339 (round-trip)
Shortest trip • 7h 22m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% 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 Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Knoxville to Ontario (TYS-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Knoxville to Ontario 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 Knoxville to Ontario

Wed, Aug 5 - Mon, Aug 10
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$260Frontier
Mon, Aug 3 - Mon, Aug 10
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$279Frontier
Wed, Aug 5 - Mon, Aug 10
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$289Frontier
Mon, Aug 3 - Wed, Aug 12
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$291Frontier
Wed, Jul 22 - Wed, Jul 29
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$295Frontier
Mon, Aug 3 - Mon, Aug 10
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$298Frontier
Wed, Jul 29 - Mon, Aug 3
Frontier Logo
8:19 pm - 11:50 pm
TYS
-
ONT
6h 31m
1 stop
Frontier Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$304Frontier
Fri, Aug 14 - Mon, Aug 24
Multiple Airlines Logo
5:54 pm - 7:32 am
TYS
-
ONT
16h 38m
1 stop
Multiple Airlines Logo
9:33 am - 2:59 pm
ONT
-
TYS
50h 26m
2 stops
$310Multiple Airlines
Fri, Aug 14 - Mon, Aug 24
Multiple Airlines Logo
5:54 pm - 7:32 am
TYS
-
ONT
16h 38m
1 stop
Multiple Airlines Logo
11:50 am - 9:46 pm
ONT
-
TYS
6h 56m
1 stop
$318Multiple Airlines
Mon, Aug 10 - Mon, Aug 17
Multiple Airlines Logo
6:30 am - 11:50 pm
TYS
-
ONT
44h 20m
2 stops
Multiple Airlines Logo
6:00 am - 7:24 pm
ONT
-
TYS
10h 24m
1 stop
$328Multiple Airlines
Booking Insights

KAYAK's insights & trends for Knoxville to Ontario flights

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

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Knoxville to Ontario, 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 Knoxville to Ontario is September, where tickets cost $368 (return) on average. On the other hand, the most expensive months are December and May, where the average cost of round-trip tickets is $556 and $538 respectively.

Good to know

Low seasonJanuary
Cheapest flight$137
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly and prices are also 21% lower on average.
Flight from Knoxville to Ontario

When to book flights from Knoxville to Ontario

Are your dates flexible? Find out the best times to travel from Knoxville to Ontario 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 Knoxville to Ontario

  • What is the cheapest flight from Knoxville to Ontario?

    In the last 5 days, the lowest price for a flight from Knoxville to Ontario was $137 for a one-way ticket and $260 for a round-trip.

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

    A passport is not required to fly from Knoxville to Ontario.

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

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

  • Which airline alliances offer flights from Knoxville to Ontario?

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

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

    The two airlines most popular with KAYAK users for flights from Knoxville to Ontario are Delta and United Airlines. With an average price for the route of $488 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 $528 and an overall rating of 7.4.

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

    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 Knoxville to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Knoxville 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 Knoxville to Ontario?

    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 Ontario with an airline and back to Knoxville with another airline. Booking your flights between Knoxville and ONT 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 Knoxville to Ontario?

    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 Ontario from Knoxville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Knoxville to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Knoxville to Ontario. 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 Knoxville to Ontario? 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 8453 reviews
7.8Comfort
7.8Entertainment
8.1Boarding
8.5Crew
7.2Food
Airline reviews

Crew was real good, flight was smooth and came in early.

10.0 ExcellentAnonymous, Jun 2026
DTW - SAN
Read more Delta reviews

Crew was real good, flight was smooth and came in early.

The CRJ-900 was clean but the overhead air vents were broken in our First Class row, making the cabin very hot until about 30 mins into the flight. The flight attendants were both extremely apologetic and accommodating though so that is why I rated the flight as very good. They checked on us many times and truly showed they cared. The snacks for an hour and a half flight could be better. Would be nice if there was a small plated meal over convenient store snacks. WiFi also was not working. And it would be nice if Delta had adjustable headrests on these planes.

Love me some Delta. One of the few airlines to recognize and support veterans. Easy boarding, flight was on time and arrived early and the flight attendants were excellent on this flight.

We sat on the runway for over an hour before departure. That was unwelcome.

Flight delayed four separate times. I’m now one hour hours late to landing.

worst flight ever from Delta, it got delayed and kept on delaying..

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

From Atlanta to Cabo I would have hoped on a plane that size I would have been able to breathe and wiggle my feet a little! The leg room in that plane is non existent and I am only 5”4’. And the air vent either wasn’t working very well or just could not blow air from the ceiling to the seat area as I was suffocating through the entire flight! And please don’t say I would have been more comfortable in first class because I cannot afford those rates and have always travelled Main Cabin without issues !

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Service was professional and quick. Premium economy seat was comfortable given the class

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Packed flight, which makes it tough on crew and boarding staff (and the customers of course). But this was great boarding, clear instructions, etc. Traveling on the weekends are always fraught with danger as you have families and less frequent flyers thus more confusion. But this flight went as planned.

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

Even though we were delayed, we were able to make our connection

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Amazing I love American. I’ll never fly anyone else if I can help it.

Did not get any refreshments. Crew was very nice but limited. Small seats

Wish a flight with more than 2 hours with some snack rather than just cookie/biscuit.

I didn’t like anything, being platinum pro get you absolutely nowhere and does not increase the customer service treatment whatsoever anymore. My flight was canceled and they put me on a flight eight hours later that would’ve got me back in the middle of the night. They could’ve easily move me up to an hour Prior on an earlier flight. My second flight was unreasonable to take, the third flight was also canceled due to mechanical issues like the first flight. I don’t know what’s going on with American, but they are falling apart, after seven flight changes I finally got home, Unreasonable.

This was a horrible American Airlines experience, and it discourages me from flying with them again. It may have stemmed from a mechanical delay, but it appeared that the team was unprepared to respond to the delay. After boarding, we waited an hour before finally taking off. After landing at our destination, we waited an additional hour on the tarmac waiting for a gate (at 8:00pm) to be assigned and cleared. The flight crew did their best, but they were clearly tired and also ready to be done for the day. Because of the delay, I missed a connecting flight. It was a very poor experience.

Fantastic! If it had not been for a check-in agent in Knoxville I may have not gotten my passes on British Airways. I couldn’t check-in online because British Airways had messed us the info on my tickets to London & Inverness. AA’s was great! British Airways was a continuous series of delays and frustrations.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

It was fine. I didn't love the food but it was at least a real attempt at serving a meal, unlike my earlier flight from Nashville to Dallas.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

Flight was cancelled and was not able to get another flight thru Frontier. Per frontier a refund was issued but I do not see a refund on my Afirm account.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Was charged 99 dollars for a bag despite agents previously telling me it would be ok. Customer service was unhelpful

I will like you ( Frontier Airlines) to fly into LAX instead of ONT because I live in LA and the subway takes me to my house in just 15 minutes

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

Information on your arrival and departure airports