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$157+ 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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — TYS
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Knoxville McGhee Tyson are usually found in April or August, booked 64 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

Cheap 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 September 16, 2025.

Round-trip from

$191
(Priceline)

One-way from

$157
(Cheapflightsfares)

Popular in

October

Cheapest in

April

Average price

$443
From Ontario to Knoxville McGhee Tyson
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One-way flight from Ontario to Knoxville McGhee Tyson
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Highest demand for flights based on searches. 2% potential increase in price ($11 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 16, 2025.

This Priceline deal was found by Cheapflights users on 9/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/196:53 amONT - TYS
1 stop9h 39mFrontier
Thu 10/238:17 pmTYS - ONT
1 stop6h 33mFrontier
Deal found 9/15$191
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/181:37 pmONT - TYS
2 stops26h 55mMultiple Airlines
Thu 10/237:00 amTYS - ONT
1 stop19h 50mMultiple Airlines
Deal found 9/15$269
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/57:15 pmONT - TYS
2 stops21h 30mFrontier
Thu 10/98:17 pmTYS - ONT
1 stop6h 33mFrontier
Deal found 9/14$298
This Priceline deal was found by Cheapflights users on 9/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:53 amONT - TYS
1 stop9h 39mFrontier
Mon 10/278:17 pmTYS - ONT
1 stop6h 33mFrontier
Deal found 9/13$311
This Delta deal was found by Cheapflights users on 9/16. 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 10/2911:36 amONT - TYS
1 stop8h 31mDelta
Wed 11/53:59 pmTYS - ONT
1 stop9h 23mDelta
Deal found 9/16$319
This American Airlines deal was found by Cheapflights users on 9/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/410:34 pmONT - TYS
1 stop8h 16mAmerican Airlines
Wed 11/125:10 amTYS - ONT
2 stops13h 51mAmerican Airlines
Deal found 9/14$323
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:38 pmONT - TYS
2 stops12h 27mUnited Airlines
Tue 11/45:45 amTYS - ONT
2 stops9h 46mUnited Airlines
Deal found 9/15$329
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:53 amONT - TYS
1 stop8h 29mFrontier
Sun 11/97:17 pmTYS - ONT
1 stop7h 33mFrontier
Deal found 9/14$337

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 September 16, 2025.
Use the filters below to find and compare flights from Ontario to Knoxville that are best for you.

Fly from

Ontario

Fly to

Knoxville

Route

Depart

Return

Price

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 10/29

2:51 pm-12:23 am

1 stop6h 32m

Knoxville McGhee Tyson

Wed 11/5

5:10 am-9:57 am

1 stop7h 47m

$319

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 10/29

11:36 am-11:07 pm

1 stop8h 31m

Knoxville McGhee Tyson

Wed 11/5

5:16 pm-10:22 pm

1 stop8h 06m

$319

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 10/28

6:38 pm-10:05 am

2 stops12h 27m

Knoxville McGhee Tyson

Tue 11/4

1:52 pm-6:36 pm

1 stop7h 44m

$324

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 10/15

6:53 am-1:33 pm

1 stop27h 40m

Knoxville McGhee Tyson

Sun 10/19

6:30 am-7:47 am

1 stop28h 17m

$343

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sat 10/18

7:05 am-9:13 pm

2 stops11h 08m

Knoxville McGhee Tyson

Thu 10/23

12:47 pm-10:22 pm

2 stops12h 35m

$388

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 11/5

10:00 pm-9:20 am

1 stop8h 20m

Knoxville McGhee Tyson

Sat 11/8

6:15 am-12:16 pm

2 stops9h 01m

$403

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sat 2/21

6:00 am-5:37 pm

1 stop8h 37m

Knoxville McGhee Tyson

Sat 2/28

5:20 pm-9:59 pm

1 stop7h 39m

$409

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 10/7

6:36 pm-10:10 am

2 stops12h 34m

Knoxville McGhee Tyson

Tue 10/14

7:00 am-3:02 pm

2 stops11h 02m

$429

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 10/23

10:30 am-7:32 pm

1 stop6h 02m

$157

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 11/6

6:53 am-6:22 pm

1 stop8h 29m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 15 results
1
2

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?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Knoxville. Price data was last updated on September 12, 2025.

To ensure you get the cheapest price possible for a flight from Ontario to Knoxville, you should look to book at least 64 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, January is the cheapest month in which you can book a flight from Ontario to Knoxville (average of $295). Flying from Ontario to Knoxville in March is currently the most expensive (average of $376). 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.

What is the cheapest time of day to fly from ONT to TYS?

Find hourly flight availability from Ontario to Knoxville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

It’s typically best to fly out from Ontario to Knoxville in the afternoon. Doing so could potentially save you 14% on the flight price compared to flying in the evening, which is usually more expensive.

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

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 September 16, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American 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
8.0
Very good
7,957 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

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
8.0
Very good
7,957 reviews
Delta
8.0
Very good
7,957 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

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
8,924 reviews
Delta
8.0
Very good
7,957 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

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
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,957 reviews

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

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 32m. 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, American Airlines will fly you from Ontario to Knoxville and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $288 and $288, respectively. These flights start at 31% lower than the current average price 3 months from now.

  • 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, January is the cheapest month in which you can book a flight from Ontario to Knoxville (average of $295). Flying from Ontario to Knoxville in March is currently the most expensive (average of $376). 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
Morristown
Cherokee
Corbin
Alcoa
Oak Ridge
Murphy

Browse thousands of different options on Cheapflights for your next trip

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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$288Average$377FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$408FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$288Average$455FlexibilityNo cancel feeOn-time69%

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