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$158+ 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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — ONT
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
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 July 1, 2025.

Round-trip from

$262
(FlightHub)

One-way from

$158
(Frontier)

Popular in

December

Cheapest in

January

Average price

$453
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. 3% potential increase in price ($14 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 1, 2025.

This FlightHub deal was found by Cheapflights users on 6/30. 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.
Sun 8/248:33 pmTYS - ONT
1 stop15h 12mFrontier
Sat 8/3012:59 amONT - TYS
1 stop15h 42mFrontier
Deal found 6/30$262
This Delta deal was found by Cheapflights users on 6/30. 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.
Mon 11/246:10 pmTYS - ONT
1 stop7h 31mDelta
Tue 12/210:59 pmONT - TYS
1 stop9h 06mDelta
Deal found 6/30$289
This American Airlines deal was found by Cheapflights users on 6/30. 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 9/248:23 amTYS - ONT
2 stops10h 42mAmerican Airlines
Wed 10/86:10 amONT - TYS
1 stop8h 23mAmerican Airlines
Deal found 6/30$294
This United Airlines deal was found by Cheapflights users on 6/30. 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.
Tue 7/15:00 pmTYS - ONT
1 stop7h 37mUnited Airlines
Wed 8/66:00 amONT - TYS
1 stop9h 11mUnited Airlines
Deal found 6/30$458

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 July 1, 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

Sun 8/24

8:33 pm-8:45 am

1 stop15h 12m

Ontario

Sat 8/30

12:59 am-7:41 pm

1 stop15h 42m

$262

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 7/22

5:30 am-10:30 am

1 stop8h 00m

Ontario

Wed 7/30

10:05 pm-9:50 am

1 stop8h 45m

$289

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 9/24

8:23 am-4:05 pm

2 stops10h 42m

Ontario

Wed 10/8

6:10 am-5:33 pm

1 stop8h 23m

$294

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Tue 8/5

4:35 pm-8:54 pm

1 stop7h 19m

Ontario

Wed 8/13

6:00 am-6:11 pm

1 stop9h 11m

$468

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Sun 7/13

5:25 pm-11:50 pm

1 stop9h 25m

$158

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 7/30

6:19 pm-10:27 pm

1 stop7h 08m

$160

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 8/20

4:40 pm-8:43 pm

1 stop7h 03m

$220

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 7/25

1:54 pm-12:15 am

2 stops13h 21m

$393

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

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 June 27, 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 July 1, 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 July 1, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and United 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,973 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,858 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Frontier
5.9
Fair
3,291 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 $262, 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 Delta and American Airlines - these airlines can fly you to your destination from $289 and $294, respectively. These flights start at 32% 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 $158. Users have also found prices from $160 and $220 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, 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 July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$258Average$431FlexibilityNo cancel feeOn-time69%
DeltaCheapest$288Average$313FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$379FlexibilityNo cancel feeOn-time71%

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