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$125+ 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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ONT
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Knoxville McGhee Tyson to Ontario are usually found in January or February, booked 15 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Cheap 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 August 14, 2025.

Round-trip from

$168
(FlightHub)

One-way from

$125
(Frontier)

Popular in

December

Cheapest in

January

Average price

$331
From Knoxville McGhee Tyson to Ontario
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One-way flight from Knoxville McGhee Tyson to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find 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 August 14, 2025.

This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:17 pmTYS - ONT
1 stop6h 33mFrontier
Thu 10/306:53 amONT - TYS
1 stop8h 29mFrontier
Deal found 8/14$168
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/27:00 amTYS - ONT
1 stop15h 54mMultiple Airlines
Sat 10/48:59 pmONT - TYS
1 stop13h 34mMultiple Airlines
Deal found 8/14$264
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/88:30 amTYS - ONT
1 stop15h 26mMultiple Airlines
Sat 9/138:59 pmONT - TYS
1 stop13h 44mMultiple Airlines
Deal found 8/13$270
This Priceline deal was found by Cheapflights users on 8/13. 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.
Fri 10/178:17 pmTYS - ONT
1 stop6h 33mFrontier
Mon 10/206:53 amONT - TYS
1 stop9h 39mFrontier
Deal found 8/13$274
This Delta deal was found by Cheapflights users on 8/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:10 pmTYS - ONT
1 stop7h 31mDelta
Mon 12/810:59 pmONT - TYS
1 stop9h 06mDelta
Deal found 8/14$289
This Trip.com deal was found by Cheapflights users on 8/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/88:30 amTYS - ONT
1 stop15h 26mMultiple Airlines
Mon 9/156:00 amONT - TYS
1 stop8h 28mMultiple Airlines
Deal found 8/13$300
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:40 pmTYS - ONT
1 stop14h 13mFrontier
Sun 9/288:59 pmONT - TYS
1 stop19h 46mFrontier
Deal found 8/13$309
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Thu 12/46:18 pmTYS - ONT
1 stop6h 40mAmerican Airlines
Mon 12/83:05 pmONT - TYS
1 stop6h 16mAmerican Airlines
Deal found 8/14$314
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Thu 9/45:19 pmTYS - ONT
1 stop7h 05mAmerican Airlines
Fri 9/122:54 pmONT - TYS
1 stop6h 27mAmerican Airlines
Deal found 8/14$316

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 August 14, 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

Thu 10/23

8:17 pm-11:50 pm

1 stop6h 33m

Ontario

Thu 10/30

6:53 am-6:22 pm

1 stop8h 29m

$168

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 10/2

7:00 am-7:54 pm

1 stop15h 54m

Ontario

Sat 10/4

8:59 pm-1:33 pm

1 stop13h 34m

$264

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 9/8

8:30 am-8:56 pm

1 stop15h 26m

Ontario

Sat 9/13

8:59 pm-1:43 pm

1 stop13h 44m

$270

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 10/17

8:17 pm-11:50 pm

1 stop6h 33m

Ontario

Mon 10/20

6:53 am-7:32 pm

1 stop9h 39m

$274

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 9/12

6:24 pm-10:33 pm

1 stop7h 09m

Ontario

Fri 9/19

10:35 pm-9:56 am

1 stop8h 21m

$289

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 12/5

6:10 pm-10:41 pm

1 stop7h 31m

Ontario

Mon 12/8

10:59 pm-11:05 am

1 stop9h 06m

$289

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 10/2

5:45 am-12:17 pm

2 stops9h 32m

Ontario

Tue 10/7

10:00 pm-9:00 am

1 stop8h 00m

$294

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 9/8

5:19 pm-9:24 pm

1 stop7h 05m

Ontario

Sat 9/13

10:53 am-11:03 pm

2 stops9h 10m

$294

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 8/21

8:36 pm-11:50 pm

1 stop6h 14m

$125

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sun 10/19

6:30 am-7:47 am

1 stop28h 17m

$131

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 16 results
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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

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

Use this chart to determine the optimal time to book a round-trip flight from Knoxville to Ontario. Price data was last updated on August 8, 2025.

The best time to book flights from Knoxville to Ontario is 15 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from Knoxville to Ontario (average of $246). Flying from Knoxville to Ontario in March is currently the most expensive (average of $328). 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 August 14, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 28% 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 August 14, 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
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
8,916 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
10,000 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

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.

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

    Currently priced at $258, United Airlines will fly you from Knoxville to Ontario and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Delta - these airlines can fly you to your destination from $288 and $288, respectively. These flights start at 33% lower than the current average price 3 months from now.

  • 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, August is the cheapest month in which you can book a flight from Knoxville to Ontario (average of $246). Flying from Knoxville to Ontario in March is currently the most expensive (average of $328). 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 3 airlines flying from Knoxville to Ontario

Discover the top 3 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$258Average$431FlexibilityNo cancel feeOn-time69%
DeltaCheapest$288Average$351FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$379FlexibilityNo cancel feeOn-time71%

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