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$107+ Cheap flights from Kentucky to Ontario (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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheap flight deals from Kentucky to Ontario

Keep the following information in mind while searching for Kentucky to Ontario flight deals. Data was last updated julio 31, 2025.

Round-trip from

$236
(Cheapflightsfares)

One-way from

$107
(Trip.com)

Popular in

April

Cheapest in

May

Average price

$209
From Kentucky to Ontario
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One-way flight from Kentucky to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($47 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($15 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 Kentucky to Ontario

Cheapest flights from Kentucky to Ontario
Explore the most affordable flight options available from Kentucky to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 31, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/117:27 pmBNA - ONT
1 stop6h 23mFrontier
vie. 8/225:09 pmONT - BNA
1 stop5h 47mFrontier
Deal found 7/29$236
This FlightHub deal was found by Cheapflights users on 7/31. 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.
mar. 8/57:15 amCVG - ONT
1 stop19h 35mFrontier
lun. 8/1112:59 amONT - CVG
1 stop20h 55mFrontier
Deal found 7/31$245
This Frontier deal was found by Cheapflights users on 7/29. 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.
dom. 8/105:25 pmTYS - ONT
1 stop9h 25mFrontier
sáb. 8/165:21 pmONT - TYS
1 stop20h 08mFrontier
Deal found 7/29$247
This SmartFares deal was found by Cheapflights users on 7/31. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/285:27 pmBNA - ONT
1 stop8h 26mHawaiian Airlines
mié. 9/311:39 amONT - BNA
1 stop10h 29mHawaiian Airlines
Deal found 7/31$252
This Delta deal was found by Cheapflights users on 7/30. 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.
jue. 9/45:15 amBNA - ONT
1 stop7h 20mDelta
jue. 9/116:00 amONT - BNA
1 stop5h 42mDelta
Deal found 7/30$263
This Delta deal was found by Cheapflights users on 7/31. 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.
vie. 8/223:40 pmLEX - ONT
1 stop9h 40mDelta
dom. 8/3111:45 amONT - LEX
1 stop9h 05mDelta
Deal found 7/31$283
This Delta deal was found by Cheapflights users on 7/31. 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.
jue. 12/46:10 pmTYS - ONT
1 stop7h 31mDelta
lun. 12/810:59 pmONT - TYS
1 stop7h 12mDelta
Deal found 7/31$289
This Alaska Airlines deal was found by Cheapflights users on 7/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/269:00 amBNA - ONT
1 stop11h 28mAlaska Airlines
dom. 8/317:22 pmONT - BNA
1 stop8h 18mAlaska Airlines
Deal found 7/31$291
This American Airlines deal was found by Cheapflights users on 7/30. 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.
vie. 8/2212:20 pmTYS - ONT
2 stops8h 32mAmerican Airlines
dom. 8/2411:59 pmONT - TYS
2 stops10h 04mAmerican Airlines
Deal found 7/30$299
This American Airlines deal was found by Cheapflights users on 7/29. 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.
mar. 8/266:00 amBNA - ONT
2 stops7h 32mAmerican Airlines
mar. 9/212:22 pmONT - BNA
2 stops8h 53mAmerican Airlines
Deal found 7/29$302
This Southwest deal was found by Cheapflights users on 7/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/274:15 pmBNA - ONT
Nonstop4h 10mSouthwest
mié. 9/36:45 amONT - BNA
Nonstop4h 00mSouthwest
Deal found 7/30$317
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/46:49 pmCVG - ONT
1 stop8h 14mAlaska Airlines
sáb. 10/116:00 amONT - CVG
1 stop8h 49mAlaska Airlines
Deal found 7/30$318

Cheapflights Fare Finder

 
Customize your flight search to find flights from Kentucky 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 julio 31, 2025.
Use the filters below to find and compare flights from Kentucky to Ontario that are best for you.

Fly from

Kentucky

Fly to

Ontario

Route

Depart

Return

Price

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

lun. 8/11

7:27 pm-11:50 pm

1 stop6h 23m

Ontario

vie. 8/22

5:09 pm-12:56 am

1 stop5h 47m

$236

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

mar. 8/5

7:15 am-11:50 pm

1 stop19h 35m

Ontario

lun. 8/11

12:59 am-12:54 am

1 stop20h 55m

$245

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

dom. 8/10

5:25 pm-11:50 pm

1 stop9h 25m

Ontario

sáb. 8/16

5:21 pm-4:29 pm

1 stop20h 08m

$247

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

jue. 8/28

5:27 pm-11:53 pm

1 stop8h 26m

Ontario

mié. 9/3

11:39 am-12:08 am

1 stop10h 29m

$252

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

jue. 9/4

5:15 am-10:35 am

1 stop7h 20m

Ontario

jue. 9/11

6:00 am-1:42 pm

1 stop5h 42m

$263

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

vie. 8/22

3:40 pm-10:20 pm

1 stop9h 40m

Ontario

dom. 8/31

11:45 am-11:50 pm

1 stop9h 05m

$283

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

vie. 8/22

6:14 pm-10:20 pm

1 stop7h 06m

Ontario

dom. 8/24

11:45 am-11:48 pm

1 stop9h 03m

$289

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

mar. 8/26

9:00 am-6:28 pm

1 stop11h 28m

Ontario

dom. 8/31

7:22 pm-5:40 am

1 stop8h 18m

$291

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

vie. 8/22

12:20 pm-5:52 pm

2 stops8h 32m

Ontario

dom. 8/24

11:59 pm-1:03 pm

2 stops10h 04m

$299

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

mar. 8/26

6:00 am-11:32 am

2 stops7h 32m

Ontario

mar. 9/2

12:22 pm-11:15 pm

2 stops8h 53m

$302

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 57 results
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Best time to book a flight from Kentucky to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Kentucky 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 Kentucky to Ontario

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

Currently, August is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $246). Flying from Kentucky 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 KY to ONT?

Find hourly flight availability from Kentucky 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 julio 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Kentucky to Ontario as you normally would.

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 julio 31, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Kentucky to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

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

Food

7.1

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

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
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

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
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

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 Kentucky to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Kentucky?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from Kentucky to Ontario.

  • What are the cheapest airlines to fly from Kentucky to Ontario one-way?

    $117 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Hawaiian Airlines and Delta, with prices starting from $132 and $133, respectively.

  • What are the most popular routes from Kentucky to Ontario?

    While some choose either Cincinnati Cinci./N. Kentucky - Ontario or Louisville Intl - Ontario, Nashville Intl - Ontario is the most popular route from Kentucky to Ontario.

  • Can I find deals for flights from Kentucky to Ontario that include hotel bookings?

    Yes. In addition to deals on Kentucky to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Kentucky to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Kentucky to Ontario.

  • Can I find deals for business class flights from Kentucky to Ontario?

    Yes. Cheapflights offers flight deals from Kentucky 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 Kentucky to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $246). Flying from Kentucky 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Kentucky to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Kentucky to Ontario

Discover the top 4 airlines that operate flights from Kentucky 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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$257Average$606FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$288Average$483FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$396FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$315Average$466FlexibilityNo cancel feeOn-time63%

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