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Ontario

$118+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 12, 2025.

This Frontier deal was found by Cheapflights users on 12/11. 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 12/214:26 pmTYS - ONT
1 stop10h 33mFrontier
Thu 12/256:45 amONT - TYS
1 stop5h 46mFrontier
Deal found 12/11$307
This Frontier deal was found by Cheapflights users on 12/10. 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 12/224:46 pmTYS - ONT
1 stop10h 13mFrontier
Mon 1/266:20 amONT - TYS
1 stop6h 15mFrontier
Deal found 12/10$395
This Frontier deal was found by Cheapflights users on 12/10. 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 12/214:26 pmTYS - ONT
1 stop10h 33mFrontier
Tue 12/236:45 amONT - TYS
1 stop6h 06mFrontier
Deal found 12/10$397
This Frontier deal was found by Cheapflights users on 12/11. 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 12/224:46 pmTYS - ONT
1 stop10h 13mFrontier
Thu 12/256:45 amONT - TYS
1 stop5h 46mFrontier
Deal found 12/11$437
This Frontier deal was found by Cheapflights users on 12/10. 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 12/214:26 pmTYS - ONT
1 stop10h 33mFrontier
Mon 12/226:45 amONT - TYS
1 stop6h 06mFrontier
Deal found 12/10$447
This Frontier deal was found by Cheapflights users on 12/10. 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
Mon 1/56:45 amONT - TYS
1 stop6h 06mFrontier
Deal found 12/10$463
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/248:40 amTYS - ONT
1 stop6h 58mUnited Airlines
Fri 12/2611:59 pmONT - TYS
1 stop7h 18mUnited Airlines
Deal found 12/10$480
This Frontier deal was found by Cheapflights users on 12/10. 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
Thu 1/16:45 amONT - TYS
1 stop5h 46mFrontier
Deal found 12/10$483
This American Airlines deal was found by Cheapflights users on 12/11. 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.
Sat 12/132:55 pmTYS - ONT
1 stop9h 12mAmerican Airlines
Fri 12/262:42 pmONT - TYS
1 stop6h 03mAmerican Airlines
Deal found 12/11$508
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/248:40 amTYS - ONT
1 stop6h 58mUnited Airlines
Thu 12/255:05 amONT - TYS
1 stop6h 55mUnited Airlines
Deal found 12/10$509
This Kiwi.com deal was found by Cheapflights users on 12/10. 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
Fri 12/266:45 amONT - TYS
2 stops32h 52mMultiple Airlines
Deal found 12/10$518
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 12/154:52 pmTYS - ONT
2 stops31h 25mFrontier
Sun 1/46:45 amONT - TYS
1 stop30h 06mFrontier
Deal found 12/10$520

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 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$148
(Frontier)

One-way from

$118
(Frontier)

Popular in

December

Cheapest in

January

Average price

$550
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.
Search Deals
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. 9% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 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 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 12, 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 1/26

4:30 pm-12:20 am

1 stop10h 50m

Ontario

Mon 2/9

6:20 am-3:35 pm

1 stop6h 15m

$165

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 1/23

4:25 pm-12:20 am

1 stop10h 55m

Ontario

Tue 2/3

3:07 pm-8:39 am

2 stops38h 32m

$314

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sat 1/31

5:00 pm-9:05 pm

1 stop7h 05m

Ontario

Sun 2/1

10:30 pm-9:24 am

1 stop7h 54m

$368

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 12/22

4:46 pm-11:59 pm

1 stop10h 13m

Ontario

Mon 1/26

6:20 am-3:35 pm

1 stop6h 15m

$395

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 1/30

6:51 pm-10:48 pm

1 stop6h 57m

Ontario

Sat 1/31

7:16 am-5:42 pm

1 stop7h 26m

$458

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sat 1/31

11:40 am-8:58 pm

2 stops12h 18m

Ontario

Sun 2/1

6:10 am-6:05 pm

1 stop8h 55m

$463

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 1/5

4:04 pm-9:08 pm

1 stop8h 04m

Ontario

Fri 1/9

1:24 pm-10:31 pm

1 stop6h 07m

$467

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 1/7

4:55 pm-9:58 pm

1 stop8h 03m

Ontario

Wed 1/14

5:05 am-8:52 pm

2 stops12h 47m

$484

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sun 1/18

11:40 am-8:58 pm

2 stops12h 18m

Ontario

Thu 1/22

6:00 am-6:05 pm

1 stop9h 05m

$485

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 1/5

4:04 pm-9:08 pm

1 stop8h 04m

Ontario

Tue 1/13

8:00 am-7:50 pm

1 stop8h 50m

$498

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 20 results
1
2

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 12, 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 12, 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
8,007 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
8,007 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
9,095 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
11,050 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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
3,084 reviews
Delta
7.9
Good
8,007 reviews

Entertainment

7.9

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.3

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 $368, Frontier can have you in Ontario from Knoxville in 7h 05m. 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 Delta. According to our data, you can fly for as low as $148. Users have also found prices from $159 and $218 on American Airlines 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 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$151Average$349FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$258Average$449FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$288Average$372FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$425FlexibilityNo cancel feeOn-timeN/A

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