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Ontario

$132+ Cheap flights from Knoxville to Ontario (TYS - ONT)

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.
TYS — ONT
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheap flight deals from Knoxville to Ontario

Cheapest flights from Knoxville to Ontario
Explore the most affordable flight options available from Knoxville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 23, 2025.

This United Airlines deal was found by Cheapflights users on 12/21. 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.
Wed 12/244:04 pmTYS - ONT
1 stop8h 03mUnited Airlines
Thu 12/255:05 amONT - TYS
1 stop6h 55mUnited Airlines
Deal found 12/21$449
This Frontier deal was found by Cheapflights users on 12/22. 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 12/294:46 pmTYS - ONT
1 stop10h 13mFrontier
Sun 1/46:45 amONT - TYS
1 stop5h 46mFrontier
Deal found 12/22$452
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Wed 12/244:04 pmTYS - ONT
1 stop8h 03mUnited Airlines
Sat 1/36:10 amONT - TYS
1 stop9h 00mUnited Airlines
Deal found 12/21$519
This United Airlines deal was found by Cheapflights users on 12/20. 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.
Wed 12/244:04 pmTYS - ONT
1 stop8h 03mUnited Airlines
Fri 12/2611:59 pmONT - TYS
1 stop7h 18mUnited Airlines
Deal found 12/20$585
This Frontier deal was found by Cheapflights users on 12/21. 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 12/284:26 pmTYS - ONT
1 stop10h 33mFrontier
Sun 1/46:45 amONT - TYS
1 stop5h 46mFrontier
Deal found 12/21$651
This Kiwi.com deal was found by Cheapflights users on 12/22. 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.
Wed 12/241:58 pmTYS - ONT
1 stop13h 01mMultiple Airlines
Sat 1/36:00 amONT - TYS
2 stops37h 22mMultiple Airlines
Deal found 12/22$656
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Thu 12/2511:58 amTYS - ONT
2 stops12h 09mUnited Airlines
Sat 12/275:05 amONT - TYS
1 stop6h 55mUnited Airlines
Deal found 12/21$658
This American Airlines deal was found by Cheapflights users on 12/22. 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.
Wed 12/242:46 pmTYS - ONT
1 stop9h 12mAmerican Airlines
Sat 1/37:10 amONT - TYS
1 stop7h 20mAmerican Airlines
Deal found 12/22$718

Find flight deals from Knoxville to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Ontario (ONT). 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 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$203
(Frontier)

One-way from

$132
(Frontier)

Popular in

December

Cheapest in

January

Average price

$553
Provider with most accurate pricing for Knoxville McGhee Tyson-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Ontario flights.
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From Knoxville McGhee Tyson to Ontario
Search Deals
One-way flight from Knoxville McGhee Tyson to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Ontario 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 23, 2025.
Use the filters below to find and compare flights from Knoxville to Ontario that are best for you.

Fly from

Knoxville

Fly to

Ontario

Route

Depart

Return

Price

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 2/2

4:30 pm-12:20 am

1 stop10h 50m

Ontario

Mon 2/23

6:10 am-7:18 pm

1 stop10h 08m

$203

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 1/21

5:40 am-11:31 am

1 stop8h 51m

Ontario

Wed 1/28

10:30 pm-9:21 am

1 stop7h 51m

$277

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 1/21

8:45 am-12:47 pm

1 stop7h 02m

Ontario

Wed 1/28

8:00 am-7:50 pm

1 stop8h 50m

$277

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sun 1/4

4:26 pm-5:15 pm

2 stops27h 49m

Ontario

Thu 1/8

6:00 am-3:28 pm

1 stop6h 28m

$280

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 3/12

5:30 am-11:40 am

1 stop9h 10m

Ontario

Tue 3/17

10:25 pm-9:16 am

1 stop7h 51m

$368

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 3/13

5:01 pm-9:04 pm

1 stop7h 03m

Ontario

Tue 3/17

10:25 pm-9:16 am

1 stop7h 51m

$368

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 1/5

8:00 am-5:15 pm

1 stop12h 15m

Ontario

Fri 1/9

8:31 am-8:39 am

2 stops45h 08m

$407

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sat 3/14

5:20 pm-11:40 am

1 stop21h 20m

Ontario

Tue 3/17

10:25 pm-9:16 am

1 stop7h 51m

$453

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 1/6

4:41 pm-10:48 pm

1 stop9h 07m

Ontario

Sat 1/10

10:58 am-10:47 pm

1 stop8h 49m

$459

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 1/2

5:35 pm-10:25 pm

1 stop7h 50m

Ontario

Sat 1/17

1:24 pm-10:31 pm

1 stop6h 07m

$461

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 21 results
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Compare providers for flights from Knoxville to Ontario

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 Knoxville to Ontario 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 Knoxville-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Knoxville-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Knoxville-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Knoxville-Ontario 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 Knoxville-Ontario 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 Knoxville to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Knoxville 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 Knoxville to Ontario

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

Currently, January is the cheapest month in which you can book a flight from Knoxville to Ontario (average of $142). Flying from Knoxville to Ontario 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 TYS to ONT?

Find hourly flight availability from Knoxville to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 23, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 27% on flights from Knoxville to Ontario by exploring options for tickets in the evening.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated December 23, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Knoxville to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,014 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
7.9
Good
8,014 reviews
Delta
7.9
Good
8,014 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
9,106 reviews
Delta
7.9
Good
8,014 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
11,054 reviews
Delta
7.9
Good
8,014 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Frontier
5.8
Fair
3,074 reviews
Delta
7.9
Good
8,014 reviews

Crew

8.5

Entertainment

7.9

Food

7.3

Boarding

8.1

Overall

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Ontario. 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 Knoxville to Ontario?

    For as low as $277, Frontier can have you in Ontario from Knoxville in 7h 02m. 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 Knoxville to Ontario round-trip?

    Currently priced at $151, Frontier will fly you from Knoxville to Ontario and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and American Airlines - these airlines can fly you to your destination from $219 and $288, respectively. These flights start at 61% lower than the current average price 3 months from now.

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

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $159. Users have also found prices from $174 and $218 on Delta and United Airlines, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Knoxville to Ontario 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 Knoxville to Ontario?

    Currently, January is the cheapest month in which you can book a flight from Knoxville to Ontario (average of $142). Flying from Knoxville to Ontario 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

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Top 4 airlines flying from Knoxville to Ontario

Discover the top 4 airlines that operate flights from Knoxville to Ontario. 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 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$151Average$349FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$258Average$449FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$288Average$375FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$425FlexibilityNo cancel feeOn-timeN/A

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