HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$90+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ONT
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Knoxville to Ontario 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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 January 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$180
(Frontier)

One-way from

$90
(Frontier)

Popular in

December

Cheapest in

February

Average price

$368
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. 13% potential increase in price ($63 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 15, 2026.

This Frontier deal was found by Cheapflights users on 1/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/24:30 pm
TYS
-
ONT
1 stop10h 50m
Frontier
Mon 2/96:20 am
ONT
-
TYS
1 stop6h 15m
Frontier
Deal found 1/14$180
This Frontier deal was found by Cheapflights users on 1/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/304:25 pm
TYS
-
ONT
1 stop10h 55m
Frontier
Mon 2/26:20 am
ONT
-
TYS
1 stop6h 15m
Frontier
Deal found 1/13$235
This Frontier deal was found by Cheapflights users on 1/15. 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 1/264:30 pm
TYS
-
ONT
1 stop10h 50m
Frontier
Fri 1/306:20 am
ONT
-
TYS
1 stop6h 10m
Frontier
Deal found 1/15$236
This Kiwi.com deal was found by Cheapflights users on 1/13. 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 3/28:13 pm
TYS
-
ONT
1 stop28h 21m
Multiple Airlines
Mon 3/99:49 pm
ONT
-
TYS
2 stops36h 02m
Multiple Airlines
Deal found 1/13$275
This Kiwi.com deal was found by Cheapflights users on 1/14. 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.
Fri 2/64:25 pm
TYS
-
ONT
1 stop10h 55m
Multiple Airlines
Sun 2/156:10 am
ONT
-
TYS
2 stops13h 15m
Multiple Airlines
Deal found 1/14$287
This Frontier deal was found by Cheapflights users on 1/15. 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 2/138:12 pm
TYS
-
ONT
1 stop6h 47m
Frontier
Mon 2/166:10 am
ONT
-
TYS
1 stop10h 08m
Frontier
Deal found 1/15$288
This Kiwi.com deal was found by Cheapflights users on 1/14. 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.
Sun 2/228:30 am
TYS
-
ONT
2 stops31h 41m
Multiple Airlines
Thu 2/262:08 pm
ONT
-
TYS
1 stop24h 58m
Multiple Airlines
Deal found 1/14$293
This Orbitz deal was found by Cheapflights users on 1/14. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/64:25 pm
TYS
-
ONT
1 stop10h 55m
Frontier
Sun 2/152:08 pm
ONT
-
TYS
1 stop26h 10m
Frontier
Deal found 1/14$295
This Delta deal was found by Cheapflights users on 1/14. 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.
Sat 8/14:00 pm
TYS
-
ONT
1 stop8h 56m
Delta
Sat 8/87:00 am
ONT
-
TYS
1 stop8h 17m
Delta
Deal found 1/14$319

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 January 15, 2026.
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-3:07 pm

1 stop25h 37m

Ontario

Mon 2/9

6:20 am-3:35 pm

1 stop6h 15m

$181

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 3/2

8:13 pm-9:34 pm

1 stop28h 21m

Ontario

Mon 3/9

9:49 pm-12:51 pm

2 stops36h 02m

$275

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sun 2/22

8:30 am-1:11 pm

2 stops31h 41m

Ontario

Thu 2/26

2:08 pm-6:06 pm

1 stop24h 58m

$293

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 2/24

2:38 pm-9:05 pm

1 stop9h 27m

Ontario

Tue 3/3

1:15 pm-11:52 pm

1 stop7h 37m

$319

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 3/11

6:21 pm-11:59 pm

1 stop8h 38m

Ontario

Wed 3/18

11:58 pm-11:30 am

1 stop8h 32m

$319

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 4/14

4:30 pm-8:36 pm

1 stop7h 06m

Ontario

Sat 4/18

5:10 am-3:06 pm

1 stop6h 56m

$319

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 2/24

10:53 am-8:50 pm

2 stops12h 57m

Ontario

Tue 3/3

8:00 am-7:55 pm

1 stop8h 55m

$324

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 2/24

8:50 am-4:22 pm

2 stops10h 32m

Ontario

Tue 3/3

9:53 am-11:59 pm

2 stops11h 06m

$330

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 3/2

8:13 pm-11:59 pm

1 stop6h 46m

$90

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 3/23

4:20 pm-11:59 pm

1 stop10h 39m

$146

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/15

Showing 1-10 of 17 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 January.
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 September is currently the most expensive (average of $270). 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.

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 January 15, 2026.
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
8,048 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

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
8,048 reviews
Delta
7.9
Good
8,048 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

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
9,163 reviews
Delta
7.9
Good
8,048 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

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
11,130 reviews
Delta
7.9
Good
8,048 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

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
5.7
Fair
3,057 reviews
Delta
7.9
Good
8,048 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

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 $319, Frontier can have you in Ontario from Knoxville in 9h 27m. 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 62% 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 $114. Users have also found prices from $174 and $204 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 September is currently the most expensive (average of $270). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Knoxville to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Nashville to Los Angeles flights
Nashville to Las Vegas flights
Memphis to Las Vegas flights
Nashville to San Francisco flights
Memphis to Los Angeles flights
Chattanooga to Las Vegas flights
Nashville to Ontario flights
Nashville to San Diego flights
Nashville to Burbank flights
Memphis to Ontario flights
Nashville to Santa Ana flights
Nashville to Sacramento flights
Knoxville to Los Angeles flights
Knoxville to Las Vegas flights
Memphis to San Diego flights
Nashville to Palm Springs flights
Nashville to Reno flights
Nashville to San Jose flights
Knoxville to San Diego flights
Chattanooga to Los Angeles flights
Nashville to Long Beach flights
Memphis to San Francisco flights
Knoxville to San Francisco flights
Chattanooga to Ontario flights
Memphis to Santa Ana flights
Blountville to Las Vegas flights
Chattanooga to San Diego flights
Knoxville to Burbank flights
Knoxville to Santa Ana flights
Memphis to Palm Springs flights
Memphis to Long Beach flights
Knoxville to Fresno flights
Memphis to Sacramento flights
Nashville to Oakland flights
Blountville to Los Angeles flights
Chattanooga to San Francisco flights
Knoxville to Sacramento flights
Memphis to Reno flights
Knoxville to San Jose flights
Memphis to Burbank flights
Chattanooga to Sacramento flights
Chattanooga to Santa Ana flights
Knoxville to Reno flights
Nashville to Fresno flights
Chattanooga to Reno flights
Nashville to Medford flights
Memphis to San Jose flights
Blountville to San Francisco flights
Chattanooga to Palm Springs flights

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 January 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$151Average$349FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$219Average$449FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$288Average$382FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$438FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.