HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Knoxville

$171+ Cheap flights from Ontario to Knoxville (ONT - TYS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — TYS
Sep 1 — Sep 81
Tue 9/1
Tue 9/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Knoxville with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Knoxville

Cheapest flights from Ontario to Knoxville
Explore the most affordable flight options available from Ontario to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 2, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2111:50 am
ONT
-
TYS
1 stop6h 56m
Multiple Airlines
Sun 8/307:00 am
TYS
-
ONT
1 stop30h 04m
Multiple Airlines
Deal found 7/29$266
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:15 am
ONT
-
TYS
2 stops13h 38m
Multiple Airlines
Sun 9/137:00 am
TYS
-
ONT
1 stop30h 30m
Multiple Airlines
Deal found 7/28$289
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/223:57 pm
ONT
-
TYS
1 stop25h 08m
Multiple Airlines
Mon 11/29:42 pm
TYS
-
ONT
1 stop17h 20m
Multiple Airlines
Deal found 8/1$297
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/223:57 pm
ONT
-
TYS
1 stop25h 08m
Multiple Airlines
Sun 11/19:29 pm
TYS
-
ONT
1 stop15h 55m
Multiple Airlines
Deal found 8/1$306
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:45 pm
ONT
-
TYS
2 stops36h 19m
Multiple Airlines
Mon 9/216:30 am
TYS
-
ONT
1 stop7h 52m
Multiple Airlines
Deal found 7/31$344
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/146:00 am
ONT
-
TYS
1 stop10h 24m
Frontier
Mon 8/178:19 pm
TYS
-
ONT
1 stop16h 45m
Frontier
Deal found 7/30$358
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:00 am
ONT
-
TYS
1 stop28h 11m
Multiple Airlines
Sat 10/244:41 pm
TYS
-
ONT
2 stops41h 31m
Multiple Airlines
Deal found 7/30$360
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:05 am
ONT
-
TYS
1 stop7h 14m
Delta
Wed 8/262:16 pm
TYS
-
ONT
1 stop8h 37m
Delta
Deal found 7/31$363

Find flight deals from Ontario to Knoxville

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Knoxville (TYS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$266
(Kiwi.com)

One-way from

$171
(Frontier)

Popular in

March

Cheapest in

September

Average price

$428
Provider with most accurate pricing for Ontario-Knoxville McGhee Tyson flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Knoxville McGhee Tyson flights.
Search Deals
From Ontario to Knoxville McGhee Tyson
Search Deals
One-way flight from Ontario to Knoxville McGhee Tyson
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Knoxville that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 2, 2026.
Use the filters below to find and compare flights from Ontario to Knoxville that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sat 9/19

12:17 pm-10:27 pm

1 stop7h 10m

Knoxville McGhee Tyson

Tue 9/29

5:40 am-11:05 am

1 stop8h 25m

$365

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Mon 9/21

10:00 pm-9:29 am

1 stop8h 29m

Knoxville McGhee Tyson

Thu 9/24

4:40 pm-10:24 pm

1 stop8h 44m

$368

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Mon 8/31

7:00 am-6:35 pm

2 stops8h 35m

Knoxville McGhee Tyson

Wed 9/2

3:00 pm-8:55 pm

2 stops8h 55m

$386

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Mon 8/31

5:15 am-3:55 pm

2 stops7h 40m

Knoxville McGhee Tyson

Thu 9/3

4:50 pm-10:05 pm

2 stops8h 15m

$439
Quickest round-trip

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 8/25

7:00 am-4:58 pm

1 stop6h 58m

Knoxville McGhee Tyson

Tue 9/1

9:00 am-12:50 pm

1 stop6h 50m

$463

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sun 9/6

7:00 am-4:58 pm

1 stop6h 58m

Knoxville McGhee Tyson

Thu 9/10

9:00 am-12:50 pm

1 stop6h 50m

$464

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sun 9/6

1:18 pm-10:29 pm

1 stop6h 11m

Knoxville McGhee Tyson

Sat 9/12

6:00 pm-10:59 pm

1 stop7h 59m

$464

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 9/22

12:17 pm-11:55 pm

1 stop8h 38m

Knoxville McGhee Tyson

Mon 9/28

6:13 pm-10:24 pm

1 stop7h 11m

$472

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 8/19

5:00 am-8:53 pm

2 stops12h 53m

Knoxville McGhee Tyson

Wed 8/26

10:40 am-8:01 pm

2 stops12h 21m

$473
Cheapest one-way

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 8/5

6:00 am-7:24 pm

1 stop10h 24m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/1

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Compare providers for flights from Ontario to Knoxville

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Knoxville in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Knoxville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Knoxville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Knoxville flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Knoxville flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Knoxville flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Knoxville

Have a flexible travel schedule? Discover the best time to fly to Knoxville from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

To ensure you get the cheapest price possible for a flight from Ontario to Knoxville, you should look to book at least 63 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Ontario to Knoxville?

Currently, September is the cheapest month in which you can book a flight from Ontario to Knoxville (average of $376). Flying from Ontario to Knoxville in March is currently the most expensive (average of $564). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Ontario to Knoxville?

Airfare is below average for this route at the moment.

Ontario to Knoxville flights typically cost between $373 and $477 in August.
The cheapest round-trip price found within the last 5 days was $266 on Multiple Airlines (Aug 21-Aug 30).

Reviews of airlines servicing Knoxville

Get insights into the airlines that provide service to Knoxville. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Knoxville. Reviews last updated August 2, 2026.
Read reviews from past customers who have flown Delta,United Airlines, andAmerican Airlines from Ontario to Knoxville. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,493 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.8

Overall

7.8

Food

7.2

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
Delta
7.8
Good
8,493 reviews
Delta
7.8
Good
8,493 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.8

Overall

7.8

Food

7.2

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
United Airlines
7.4
Good
10,061 reviews
Delta
7.8
Good
8,493 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.8

Overall

7.8

Food

7.2

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin
American Airlines
7.1
Good
11,846 reviews
Delta
7.8
Good
8,493 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.8

Overall

7.8

Food

7.2

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Related info for your journey

Find useful and relevant information for your journey from Ontario to Knoxville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Knoxville?

    Departing from Ontario to Knoxville will take you 6h 58m. Airlines will cover a distance of 1897 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Ontario to Knoxville round-trip?

    Currently priced at $288, Delta will fly you from Ontario to Knoxville and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and United Airlines - these airlines can fly you to your destination from $313 and $318, respectively. These flights start at 39% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Knoxville one-way?

    The cheapest airlines for a one-way flight from Ontario to Knoxville are Frontier ($161), American Airlines ($186), and United Airlines ($186).

  • Can I find deals for flights from Ontario to Knoxville that include hotel bookings?

    Yes. In addition to deals on Ontario to Knoxville flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Knoxville?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Knoxville.

  • Can I find deals for business class flights from Ontario to Knoxville?

    Yes. Cheapflights offers flight deals from Ontario to Knoxville by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Knoxville?

    Currently, September is the cheapest month in which you can book a flight from Ontario to Knoxville (average of $376). Flying from Ontario to Knoxville in March is currently the most expensive (average of $564). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Knoxville?

Book flights to Knoxville if you plan to visit one of these locations
Cherokee
Crossville
Morristown
Bryson City
Murphy
Alcoa

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Knoxville

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Nashville flights
San Francisco to Nashville flights
Ontario to Nashville flights
San Diego to Nashville flights
Burbank to Nashville flights
Sacramento to Nashville flights
Las Vegas to Nashville flights
Long Beach to Nashville flights
Los Angeles to Memphis flights
Oakland to Nashville flights
Santa Ana to Nashville flights
San Jose to Nashville flights
San Francisco to Knoxville flights
Los Angeles to Knoxville flights
Fresno to Nashville flights
San Francisco to Memphis flights
San Diego to Knoxville flights
Ontario to Memphis flights
Sacramento to Knoxville flights
San Diego to Memphis flights
Sacramento to Memphis flights
Santa Rosa to Nashville flights
Santa Ana to Knoxville flights
San Luis Obispo to Nashville flights
Bakersfield to Nashville flights
Las Vegas to Knoxville flights
Santa Barbara to Nashville flights
Reno to Nashville flights
Santa Ana to Memphis flights
Palm Springs to Nashville flights
Las Vegas to Memphis flights
Los Angeles to Chattanooga flights
San Jose to Memphis flights
San Francisco to Chattanooga flights
Fresno to Knoxville flights
San Jose to Knoxville flights
Burbank to Chattanooga flights
Medford to Knoxville flights
Ontario to Chattanooga flights
Burbank to Knoxville flights
Oakland to Memphis flights
Monterey to Nashville flights
San Diego to Chattanooga flights
Medford to Nashville flights
Sacramento to Chattanooga flights
Oakland to Knoxville flights
Fresno to Memphis flights
Las Vegas to Chattanooga flights

Top 3 airlines flying from Ontario to Knoxville

Discover the top 3 airlines that operate flights from Ontario to Knoxville. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$288Average$456FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$313Average$477FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$318Average$476FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.