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$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 10/13. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$151
(Priceline)

One-way from

$132
(Trip.com)

Popular in

December

Cheapest in

January

Average price

$410
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. 5% potential increase in price ($24 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 September 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 September 17, 2025.

This Priceline 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 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
Sun 10/266:53 amONT - TYS
1 stop9h 39mFrontier
Deal found 9/16$151
This Frontier 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 Frontier 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
Sun 10/266:53 amONT - TYS
1 stop9h 39mFrontier
Deal found 9/16$161
This Frontier deal was found by Cheapflights users on 9/17. 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.
Fri 10/178:17 pmTYS - ONT
1 stop6h 33mFrontier
Mon 10/206:53 amONT - TYS
1 stop9h 39mFrontier
Deal found 9/17$301
This Priceline deal was found by Cheapflights users on 9/17. 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.
Mon 10/278:17 pmTYS - ONT
1 stop6h 33mFrontier
Thu 10/306:53 amONT - TYS
1 stop8h 29mFrontier
Deal found 9/17$319
This Frontier deal was found by Cheapflights users on 9/17. 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 10/238:17 pmTYS - ONT
1 stop6h 33mFrontier
Mon 10/276:53 amONT - TYS
1 stop9h 39mFrontier
Deal found 9/17$333
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/243:25 pmTYS - ONT
2 stops27h 04mMultiple Airlines
Sat 9/278:59 pmONT - TYS
1 stop13h 44mMultiple Airlines
Deal found 9/16$341
This Booking.com deal was found by Cheapflights users on 9/17. 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.
Thu 12/114:47 pmTYS - ONT
1 stop21h 10mFrontier
Sun 12/144:02 pmONT - TYS
1 stop20h 50mFrontier
Deal found 9/17$368
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/27:20 amTYS - ONT
1 stop14h 15mMultiple Airlines
Sun 10/512:28 pmONT - TYS
2 stops23h 04mMultiple Airlines
Deal found 9/16$378
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:25 amTYS - ONT
2 stops37h 31mMultiple Airlines
Sat 9/278:59 pmONT - TYS
1 stop13h 44mMultiple Airlines
Deal found 9/16$400

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 September 17, 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

Sun 10/26

6:53 am-7:32 pm

1 stop9h 39m

$161

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sat 2/21

5:00 pm-9:14 pm

1 stop7h 14m

Ontario

Wed 2/25

10:30 pm-9:13 am

1 stop7h 43m

$339

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 10/29

4:55 pm-8:44 pm

1 stop6h 49m

Ontario

Sat 11/8

5:05 am-2:42 pm

1 stop6h 37m

$409

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 12/4

5:24 am-9:54 am

1 stop7h 30m

Ontario

Mon 12/8

3:04 pm-11:59 pm

1 stop5h 55m

$417

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 11/24

5:52 pm-10:31 pm

1 stop7h 39m

Ontario

Fri 11/28

5:05 am-3:51 pm

1 stop7h 46m

$417

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 10/1

5:45 am-10:42 am

1 stop7h 57m

Ontario

Tue 10/7

10:00 pm-9:00 am

1 stop8h 00m

$419

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 12/5

12:10 pm-6:17 pm

1 stop9h 07m

Ontario

Mon 12/8

10:47 am-11:57 pm

2 stops10h 10m

$422

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 12/5

3:56 pm-11:59 pm

2 stops11h 03m

Ontario

Mon 12/8

4:49 pm-9:36 am

2 stops13h 47m

$427

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 10/1

9:30 am-5:23 pm

2 stops10h 53m

Ontario

Tue 10/7

6:36 pm-10:10 am

2 stops12h 34m

$429

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 10/20

8:17 pm-11:50 pm

1 stop6h 33m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 18 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 September 12, 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 $327). 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 September 17, 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 September 17, 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
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

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
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

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
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

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
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

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
3,173 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

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 $161, Frontier can have you in Ontario from Knoxville in 6h 33m. 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 $258 and $288, respectively. These flights start at 60% 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 Frontier. According to our data, you can fly for as low as $198. Users have also found prices from $210 and $219 on United Airlines and American 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, 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 $327). 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$151Average$302FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$258Average$431FlexibilityNo cancel feeOn-time69%
DeltaCheapest$288Average$354FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$378FlexibilityNo cancel feeOn-time71%

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