TYS - ONT

$101 Find Cheap Flights from Knoxville to Ontario

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 4/30. 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
$190
Overall average: $412
Frontier
Thu 4/23Sat 4/25
TYS - ONT • 1 stop
Cheapest one-way
$101
Typical prices: $114-$534
Frontier
Thu 4/30
TYS - ONT • 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 travel
August
Cheapest • 21% price drop
February
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

Thu, Apr 23 - Sat, Apr 25
Frontier Logo
4:28 pm - 11:55 pm
TYS
-
ONT
10h 27m
1 stop
Frontier Logo
12:59 am - 3:33 pm
ONT
-
TYS
11h 34m
1 stop
$190Frontier
Thu, May 7 - Sat, May 9
Frontier Logo
4:28 pm - 11:55 pm
TYS
-
ONT
10h 27m
1 stop
Frontier Logo
12:59 am - 3:33 pm
ONT
-
TYS
11h 34m
1 stop
$276Frontier
Thu, Apr 16 - Wed, Apr 22
Frontier Logo
4:28 pm - 7:31 am
TYS
-
ONT
18h 03m
1 stop
Frontier Logo
12:59 am - 3:33 pm
ONT
-
TYS
11h 34m
1 stop
$287Frontier
Wed, Mar 11 - Wed, Mar 18
American Airlines Logo
2:49 pm - 9:24 pm
TYS
-
ONT
9h 35m
1 stop
American Airlines Logo
11:58 pm - 11:30 am
ONT
-
TYS
8h 32m
1 stop
$319American Airlines
Wed, Mar 4 - Sat, Apr 4
American Airlines Logo
5:40 am - 11:31 am
TYS
-
ONT
8h 51m
2 stops
American Airlines Logo
2:39 pm - 11:51 pm
ONT
-
TYS
6h 12m
1 stop
$324American Airlines
Mon, Mar 23 - Fri, Mar 27
Frontier Logo
4:20 pm - 11:59 pm
TYS
-
ONT
10h 39m
1 stop
Frontier Logo
6:15 am - 3:25 pm
ONT
-
TYS
6h 10m
1 stop
$329Frontier
Tue, Jun 30 - Tue, Jul 7
United Airlines Logo
5:57 pm - 10:28 pm
TYS
-
ONT
7h 31m
1 stop
United Airlines Logo
1:00 pm - 10:20 pm
ONT
-
TYS
6h 20m
1 stop
$338United Airlines
Thu, Mar 12 - Wed, Mar 18
American Airlines Logo
12:21 pm - 6:42 pm
TYS
-
ONT
9h 21m
1 stop
American Airlines Logo
11:58 pm - 11:30 am
ONT
-
TYS
8h 32m
1 stop
$339American Airlines
Thu, Mar 5 - Wed, Mar 11
American Airlines Logo
5:40 am - 10:06 am
TYS
-
ONT
7h 26m
1 stop
American Airlines Logo
7:59 pm - 8:42 am
ONT
-
TYS
9h 43m
2 stops
$344American Airlines
Wed, Mar 11 - Wed, Mar 18
Multiple Airlines Logo
10:00 am - 1:11 pm
TYS
-
ONT
30h 11m
1 stop
Multiple Airlines Logo
2:23 pm - 8:08 am
ONT
-
TYS
38h 45m
2 stops
$359Multiple 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.

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 August, where tickets cost $331 (return) on average. On the other hand, the most expensive months are December and January, where the average cost of round-trip tickets is $556 and $530 respectively.

Good to know

Low seasonJanuary
Cheapest flight$101
Best time to beat the crowds but there is an average 26% increase in price.
Most popular time to fly and prices are also 15% 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 3 days, the lowest price for a flight from Knoxville to Ontario was $101 for a one-way ticket and $190 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 $403 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 $449 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.
7.9
DeltaOverall score based on 8180 reviews
7.9Comfort
8.1Boarding
8.5Crew
7.2Food
7.8Entertainment
Airline reviews

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

2.0 MediocreJaspreet, Feb 2026
SEA - SMF
Read more Delta reviews

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

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.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

The crew took good care of us. The flight from ATL to SFO is a longer one, and there were multiple beverage offerings. I like the 757's that Delta uses. Good airplane that is comfortable. I do wish Delta would separate Priority boarding from the better seats. I would gladly take a smaller seat in an open row than be jammed into Comfort just to get priority boarding, just to make sure I don't have to check a bag.

Gate agent rushed to fill hot jetway with crowd so it took over 12 minutes to go from gate to plane. Just like a discount airline Pooly prepared cabin and third time that claim of rough air prevented any cabin service. Friends on a Southwest flight at similar time had service.

I was uncomfortably cold on the plane. Other than that it was uneventful and therefore as enjoyable as a plane ride can be.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Flight was late - I was downgraded from first class to coach

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

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

They are always late and seats was also not having working charger

did not have enough meal for first class passengers so offer us snack

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

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

After the door had been closed, the cockpit makes an announcement that catering is running late and it is not the airline's fault. It is their fault in the sense that we had to sit for 2 hours or more when we could have stayed in the terminal. Poor communications between catering and airline. This caused a young man to lose his temper and he went storming out hitting objects. He had complained to the gate agent that he had already waited at the gate 7 hours and when can the airplane leave? Airilnes do a poor job of explaining delays, maintenance issues, etc. whereas being truthful may gain more sympathy or understanding.

We were told the flight was delayed 5 times, then it was moved to the next day.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

Loved the crew . Absolutely no complaints. Except for luggage lost

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

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

It didn’t happen. I booked it and then was told it wasn’t available and then forced to pay far higher prices for a worse option

A 630departure flight Delayed 6hours! They changed my gate, I moved to the new gate. Had our flight on the screen for 12noon departure. I go get above to eat, check screen again and the flight was gone, no notice no announcement, nothing!! They sent my bag on the flight I wasn’t on, got it back to me 3days later. Thank goodness they did refund my money but I will NEVER fly them again.

Due to weather, my flight was delayed, further delayed, then canceled. I eventually got through to a support person who helped me find a different route out of MSP, but to get to DIA, they didn't want to, but eventually did help with the connection ticket purchase. But even this replacement flight was delayed time and time again, and I would have missed my connecting flights and I didn't want to get stuck in a layover city, so after 12 hours at the airport with two young boys who were very tired, we just cancelled our plans and spent the week at home, instead of Nana's.

Plane and crew on board were fine. Everything else was terrible.

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

Information on your arrival and departure airports