What is the cheapest airline that flies from Kentucky to Ontario?

Frontier, Delta, and United Airlines are the most popular carriers operating from Kentucky to Ontario

What airlines fly to Ontario?

American Airlines, Spirit Airlines and Delta are the top three most popular airlines that fly to Ontario from Kentucky according to our data. American Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 5 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

How many flights depart from Kentucky to Ontario on average per week?

As of December 2025, there are 8 flights per week flying from Kentucky to Ontario. The most common day of the week flights depart is Mon, with 25% of flights taking off on this day.

How long does it take to fly to Ontario?

Average flight duration from Kentucky to Ontario depends on which airport you fly into and out of. Flying from Louisville to Los Angeles is 6h 32m on average, while flying from Lexington to Los Angeles is 7h 37m on average. Los Angeles is the most popular airport in Ontario.

When did momondo last update prices for flights from Kentucky to Ontario Airport?

Prices for flights from Kentucky to Ontario Airport refresh daily.

How many operators does momondo search for flights from Kentucky to Ontario Airport?

As of December 2025, there are 5 operators available to choose from for flights from Kentucky to Ontario Airport.

How old do you have to be to fly from Kentucky to Ontario Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Kentucky to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$69 Cheap Flights from Kentucky to Ontario in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Kentucky to Los Angeles

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:30 pm - 12:20 am

TYS

ONT

10h 50m1 stop

6:20 am - 3:35 pm

ONT

TYS

6h 15m1 stop

$148Frontier

Mon, Jan 26 - Mon, Feb 9

7:29 pm - 11:59 pm

BNA

ONT

6h 30m1 stop

6:10 am - 6:50 pm

ONT

BNA

10h 40m1 stop

$148Frontier

Fri, Feb 20 - Mon, Feb 23

9:00 am - 12:47 pm

LEX

ONT

6h 47m1 stop

1:24 pm - 10:30 pm

ONT

LEX

6h 06m1 stop

$283United Airlines

Tue, Jan 13 - Sat, Jan 17

9:00 am - 12:47 pm

LEX

ONT

6h 47m1 stop

5:05 am - 5:04 pm

ONT

LEX

8h 59m2 stops

$288United Airlines

Tue, Jan 13 - Sat, Jan 17

2:17 pm - 9:05 pm

LEX

ONT

9h 48m1 stop

10:30 pm - 10:27 am

ONT

LEX

8h 57m1 stop

$289Delta

Thu, Jan 8 - Thu, Jan 15

8:07 am - 6:20 pm

LEX

ONT

13h 13m2 stops

9:59 am - 10:10 pm

ONT

LEX

9h 11m2 stops

$293American Airlines

Tue, Jan 13 - Sat, Jan 17

2:17 pm - 9:05 pm

LEX

ONT

9h 48m1 stop

10:30 pm - 10:27 am

ONT

LEX

8h 57m1 stop

$310Delta

Thu, Jan 8 - Thu, Jan 15

4:25 pm - 12:20 am

TYS

ONT

10h 55m1 stop

3:07 pm - 8:39 am

ONT

TYS

38h 32m2 stops

$314Multiple Airlines

Fri, Jan 23 - Tue, Feb 3

8:00 am - 5:15 pm

TYS

ONT

12h 15m1 stop

10:18 pm - 3:28 pm

ONT

TYS

38h 10m2 stops

$320Multiple Airlines

Mon, Jan 5 - Fri, Jan 9

7:03 am - 11:20 am

EVV

ONT

6h 17m1 stop

6:00 am - 2:10 pm

ONT

EVV

6h 10m1 stop

$439American Airlines

Wed, May 6 - Tue, May 12

Frontier flights from Kentucky to Ontario

Our best Frontier deals on Kentucky to Ontario flight tickets

Frontier

Feb 20

BNA7:29 pmNashville Intl

6h 30m

1 stop

ONT11:59 pmOntario

Feb 23

ONT6:10 amOntario

10h 40m

1 stop

BNA6:50 pmNashville Intl

$148

Find similar

Frontier

Jan 26

CVG1:45 pmCincinnati Cinci./N. Kentucky

28h 22m

1 stop

ONT3:07 pmOntario

Jan 30

ONT10:18 amOntario

10h 39m

1 stop

CVG11:57 pmCincinnati Cinci./N. Kentucky

$149

Find similar

Frontier

Jan 26

TYS4:30 pmKnoxville McGhee Tyson

10h 50m

1 stop

ONT12:20 amOntario

Feb 9

ONT6:20 amOntario

6h 15m

1 stop

TYS3:35 pmKnoxville McGhee Tyson

$165

Find similar

Southwest flights from Kentucky to Ontario

Our best Southwest deals on Kentucky to Ontario flight tickets

Southwest

Jan 17

SDF8:55 amLouisville Intl

8h 55m

1 stop

ONT2:50 pmOntario

Jan 24

ONT7:00 amOntario

9h 10m

2 stops

SDF7:10 pmLouisville Intl

$335

Find similar

Southwest

Feb 5

SDF6:25 amLouisville Intl

7h 15m

1 stop

ONT10:40 amOntario

Feb 8

ONT1:00 pmOntario

7h 20m

1 stop

SDF11:20 pmLouisville Intl

$398

Find similar

Southwest

Feb 5

SDF1:30 pmLouisville Intl

7h 05m

1 stop

ONT5:35 pmOntario

Feb 8

ONT11:10 amOntario

9h 10m

2 stops

SDF11:20 pmLouisville Intl

$403

Find similar

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 1/26

4:30 pm-12:20 am

1 stop10h 50m

Ontario

Mon 2/9

6:20 am-3:35 pm

1 stop6h 15m

$148

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Fri 2/20

7:29 pm-11:59 pm

1 stop6h 30m

Ontario

Mon 2/23

6:10 am-6:50 pm

1 stop10h 40m

$148

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Tue 1/13

9:00 am-12:47 pm

1 stop6h 47m

Ontario

Sat 1/17

1:24 pm-10:30 pm

1 stop6h 06m

$283

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Tue 1/13

9:00 am-12:47 pm

1 stop6h 47m

Ontario

Sat 1/17

5:05 am-5:04 pm

2 stops8h 59m

$288

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Thu 1/8

2:17 pm-9:05 pm

1 stop9h 48m

Ontario

Thu 1/15

10:30 pm-10:27 am

1 stop8h 57m

$289

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Tue 1/13

8:07 am-6:20 pm

2 stops13h 13m

Ontario

Sat 1/17

9:59 am-10:10 pm

2 stops9h 11m

$293

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Thu 1/8

2:17 pm-9:05 pm

1 stop9h 48m

Ontario

Thu 1/15

10:30 pm-10:27 am

1 stop8h 57m

$310

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 1/23

4:25 pm-12:20 am

1 stop10h 55m

Ontario

Tue 2/3

3:07 pm-8:39 am

2 stops38h 32m

$314

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Mon 1/5

8:00 am-5:15 pm

1 stop12h 15m

Ontario

Fri 1/9

10:18 pm-3:28 pm

2 stops38h 10m

$320

EvansvilleOntario

EVV - ONT

EVVONT

Evansville Dress Regional

Wed 5/6

7:03 am-11:20 am

1 stop6h 17m

Ontario

Tue 5/12

6:00 am-2:10 pm

1 stop6h 10m

$439

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Kentucky to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Ontario?

In general, October is the cheapest month to fly from Kentucky to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $332. If you aren’t able to travel during the month of October, then book flights to Ontario from Kentucky during September instead. Flights to Ontario in September, while not as cheap as those in October, still average around $343.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Thursday when prices can be found for as low as $461. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Kentucky to Ontario for around $597.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from Kentucky to Ontario when you can find flight prices for as low as $417. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $665 on average. Flights to Ontario from Kentucky at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Cheap Kentucky to Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Kentucky to Ontario

Fastest flight time	4h 35m
Direct flights	Every day
Airports in Ontario	1 airport

The fastest flight from Kentucky to Ontario takes 4h 35m

Direct flights go from Kentucky to Ontario every day.

There is 1 airport in Ontario. From Kentucky there are direct flights to Ontario (ONT).

Search flight deals

When did momondo last update prices for flights from Kentucky to Ontario Airport?
Prices for flights from Kentucky to Ontario Airport refresh daily.
How many operators does momondo search for flights from Kentucky to Ontario Airport?
As of December 2025, there are 5 operators available to choose from for flights from Kentucky to Ontario Airport.
How old do you have to be to fly from Kentucky to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Kentucky to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Kentucky to Ontario

Compare and see reviews for airlines that fly from Kentucky to Ontario with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $268	Free Cancellation	Rating 7.2 11,050 reviews	Search American Airlines flights
Delta	PriceFrom $288	Free Cancellation	Rating 7.9 8,008 reviews	Search Delta flights
Southwest	PriceFrom $302	Free Cancellation	Rating 7.9 4,253 reviews	Search Southwest flights
United Airlines	PriceFrom $344	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Kentucky to Ontario?

Finding the right flight to Ontario from Kentucky is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

Can I find flights from Kentucky to Ontario with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Ontario from Kentucky with this policy.

How can momondo help me find flights from Kentucky to Ontario?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Kentucky to Ontario.

I’m not ready to book a flight from Kentucky to Ontario right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Kentucky to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.