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Knoxville

$126+ 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — TYS
Jan 4 — Jan 111
Sun 1/4
Sun 1/11
1 adult, Economy
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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

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3. Compare prices and book

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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

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 December 5, 2025.

This Frontier deal was found by Cheapflights users on 12/4. 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 12/256:45 amONT - TYS
1 stop5h 46mFrontier
Thu 1/14:26 pmTYS - ONT
1 stop10h 33mFrontier
Deal found 12/4$282
This Frontier deal was found by Cheapflights users on 12/4. 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.
Mon 12/296:45 amONT - TYS
1 stop6h 06mFrontier
Mon 1/54:46 pmTYS - ONT
1 stop10h 13mFrontier
Deal found 12/4$333
This Booking.com deal was found by Cheapflights users on 12/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/144:01 pmONT - TYS
1 stop20h 56mFrontier
Tue 12/304:46 pmTYS - ONT
1 stop10h 13mFrontier
Deal found 12/4$349
This Kiwi.com deal was found by Cheapflights users on 12/2. 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 12/86:15 amONT - TYS
1 stop7h 47mMultiple Airlines
Mon 12/154:52 pmTYS - ONT
2 stops31h 25mMultiple Airlines
Deal found 12/2$353
This Frontier deal was found by Cheapflights users on 12/4. 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 12/256:45 amONT - TYS
1 stop5h 46mFrontier
Tue 12/304:46 pmTYS - ONT
1 stop10h 13mFrontier
Deal found 12/4$363
This Frontier deal was found by Cheapflights users on 12/2. 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 12/186:45 amONT - TYS
1 stop5h 46mFrontier
Tue 12/234:46 pmTYS - ONT
1 stop10h 13mFrontier
Deal found 12/2$387
This Frontier deal was found by Cheapflights users on 12/4. 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 12/186:45 amONT - TYS
1 stop5h 46mFrontier
Sun 12/214:26 pmTYS - ONT
1 stop10h 33mFrontier
Deal found 12/4$412
This Frontier deal was found by Cheapflights users on 12/4. 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.
Mon 12/226:45 amONT - TYS
1 stop6h 06mFrontier
Thu 12/254:26 pmTYS - ONT
1 stop10h 33mFrontier
Deal found 12/4$433
This Kiwi.com deal was found by Cheapflights users on 12/3. 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 12/112:59 pmONT - TYS
1 stop23h 03mMultiple Airlines
Sat 12/138:32 pmTYS - ONT
2 stops20h 32mMultiple Airlines
Deal found 12/3$458
This Delta deal was found by Cheapflights users on 12/2. 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.
Tue 12/910:25 pmONT - TYS
1 stop8h 13mDelta
Tue 12/163:57 pmTYS - ONT
1 stop6h 42mDelta
Deal found 12/2$459
This United Airlines deal was found by Cheapflights users on 12/2. 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 12/96:00 amONT - TYS
2 stops10h 54mUnited Airlines
Tue 12/164:30 pmTYS - ONT
1 stop7h 12mUnited Airlines
Deal found 12/2$464

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 December 5, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$186
(Frontier)

One-way from

$126
(Frontier)

Popular in

October

Cheapest in

April

Average price

$479
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. 3% potential increase in price ($16 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 December 2025
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 December 5, 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 1/28

10:58 am-11:59 pm

2 stops10h 01m

Knoxville McGhee Tyson

Thu 1/29

12:19 pm-10:13 pm

2 stops12h 54m

$272

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 2/19

7:50 pm-8:41 am

2 stops9h 51m

Knoxville McGhee Tyson

Sun 2/22

4:30 pm-10:29 pm

1 stop8h 59m

$293

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 1/22

1:24 pm-10:31 pm

1 stop6h 07m

Knoxville McGhee Tyson

Sun 1/25

4:55 pm-9:58 pm

1 stop8h 03m

$378

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 1/8

6:00 am-6:05 pm

1 stop9h 05m

Knoxville McGhee Tyson

Mon 1/12

11:07 am-8:58 pm

2 stops12h 51m

$383

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 2/18

7:50 pm-8:41 am

2 stops9h 51m

Knoxville McGhee Tyson

Sun 2/22

5:35 am-11:37 am

2 stops9h 02m

$398

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 1/7

5:05 am-8:52 pm

2 stops12h 47m

Knoxville McGhee Tyson

Mon 1/12

6:45 am-12:47 pm

2 stops33h 02m

$430

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 5/5

8:05 am-7:40 pm

2 stops8h 35m

Knoxville McGhee Tyson

Fri 5/8

8:05 am-3:15 pm

1 stop10h 10m

$432

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Mon 3/30

10:30 pm-9:16 am

1 stop7h 46m

Knoxville McGhee Tyson

Fri 4/3

5:01 pm-9:04 pm

1 stop7h 03m

$437

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sun 1/11

6:00 am-3:28 pm

1 stop6h 28m

$126

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sun 12/21

6:45 am-3:31 pm

1 stop5h 46m

$176

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/5

Showing 1-10 of 17 results
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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Knoxville flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Knoxville. Price data was last updated on November 28, 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 $42). Flying from Ontario to Knoxville in June is currently the most expensive (average of $288). 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 December 5, 2025.

It’s typically best to fly out from Ontario to Knoxville in the afternoon. Doing so could potentially save you 12% on the flight price compared to flying in the evening, which is usually more expensive.

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 December 5, 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
7.9
Good
8,009 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

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
7.9
Good
8,009 reviews
Delta
7.9
Good
8,009 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

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
9,065 reviews
Delta
7.9
Good
8,009 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

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
11,043 reviews
Delta
7.9
Good
8,009 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Crew

8.5

Boarding

8.1

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 07m. 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 United Airlines and Delta - 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.

  • 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 American Airlines ($131), Delta ($201), and United Airlines ($218).

  • 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 $42). Flying from Ontario to Knoxville in June is currently the most expensive (average of $288). 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
Corbin
Bryson City
Alcoa
Oak Ridge
Murphy

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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 December 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$288Average$417FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$288Average$488FlexibilityNo cancel feeOn-time69%
DeltaCheapest$288Average$404FlexibilityNo cancel feeOn-timeN/A

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