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$116+ Cheap flights from Jacksonville to Ontario (JAX - 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 11/13. Fares are subject to change and may not be available on all flights or dates of travel.
JAX — ONT
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheapflights Tip: The best prices from Jacksonville to Ontario are usually found in April or May, booked 38 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from Jacksonville to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Jacksonville (JAX) 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 August 18, 2025.

Round-trip from

$254
(Frontier)

One-way from

$116
(Frontier)

Popular in

August

Cheapest in

April

Average price

$718
From Jacksonville to Ontario
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One-way flight from Jacksonville to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($52 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Jacksonville to Ontario

Cheapest flights from Jacksonville to Ontario
Explore the most affordable flight options available from Jacksonville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Frontier deal was found by Cheapflights users on 8/17. 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.
Mon 10/2711:37 amJAX - ONT
2 stops13h 28mFrontier
Fri 10/318:24 amONT - JAX
1 stop6h 45mFrontier
Deal found 8/17$254
This American Airlines deal was found by Cheapflights users on 8/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:18 amJAX - ONT
1 stop7h 37mAmerican Airlines
Wed 9/2412:47 pmONT - JAX
1 stop7h 08mAmerican Airlines
Deal found 8/17$297
This Delta deal was found by Cheapflights users on 8/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/236:20 amJAX - ONT
1 stop7h 22mDelta
Sat 9/277:05 amONT - JAX
1 stop5h 58mDelta
Deal found 8/17$313
This Southwest deal was found by Cheapflights users on 8/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/136:05 amJAX - ONT
1 stop9h 25mSouthwest
Sat 9/209:05 amONT - JAX
1 stop9h 20mSouthwest
Deal found 8/16$329
This Delta deal was found by Cheapflights users on 8/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1311:52 amJAX - ONT
2 stops10h 23mDelta
Sat 9/2011:55 amONT - JAX
1 stop9h 00mDelta
Deal found 8/16$334
This Delta deal was found by Cheapflights users on 8/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/67:20 amJAX - ONT
1 stop6h 15mDelta
Sat 9/1311:55 amONT - JAX
1 stop6h 42mDelta
Deal found 8/16$338
This American Airlines deal was found by Cheapflights users on 8/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/138:21 amJAX - ONT
2 stops12h 55mAmerican Airlines
Sat 9/2010:20 amONT - JAX
2 stops9h 54mAmerican Airlines
Deal found 8/16$339
This American Airlines deal was found by Cheapflights users on 8/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/68:36 amJAX - ONT
2 stops12h 40mAmerican Airlines
Sat 9/1310:35 pmONT - JAX
1 stop7h 35mAmerican Airlines
Deal found 8/16$343

Cheapflights Fare Finder

 
Customize your flight search to find flights from Jacksonville 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 August 18, 2025.
Use the filters below to find and compare flights from Jacksonville to Ontario that are best for you.

Fly from

Jacksonville

Fly to

Ontario

Route

Depart

Return

Price

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Mon 10/27

11:37 am-10:05 pm

2 stops13h 28m

Ontario

Fri 10/31

8:24 am-6:09 pm

1 stop6h 45m

$254

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Wed 10/22

3:59 pm-9:36 pm

1 stop8h 37m

Ontario

Wed 10/29

10:29 pm-9:55 am

1 stop8h 26m

$297

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Tue 9/9

7:18 am-11:55 am

1 stop7h 37m

Ontario

Wed 9/24

12:47 pm-10:55 pm

1 stop7h 08m

$297

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Tue 9/23

6:20 am-10:42 am

1 stop7h 22m

Ontario

Sat 9/27

7:05 am-4:03 pm

1 stop5h 58m

$313

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Fri 10/24

11:37 am-11:50 pm

2 stops15h 13m

Ontario

Sun 10/26

10:47 pm-10:52 am

2 stops9h 05m

$313

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Thu 11/13

5:13 pm-11:50 pm

2 stops9h 37m

$116

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Sun 11/16

5:13 pm-11:50 pm

2 stops9h 37m

$125

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Fri 10/17

11:37 am-7:49 am

1 stop23h 12m

$128

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Thu 9/11

12:38 pm-11:38 pm

2 stops14h 00m

$129

JacksonvilleOntario

JAX - ONT

JAXONT

Jacksonville

Thu 9/4

12:38 pm-11:38 pm

2 stops14h 00m

$129

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 14 results
1
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Best time to book a flight from Jacksonville to Ontario

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

How far ahead should I book a flight from Jacksonville to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Jacksonville to Ontario. Price data was last updated on August 8, 2025.

Booking 37 days in advance of your planned departure date is, on average, the best time to get cheap flights from Jacksonville to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

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

Find hourly flight availability from Jacksonville 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 August 18, 2025.

A simple way to save on the total cost of your ticket is to fly from Jacksonville to Ontario at noon. If you’re flexible enough to do this you can expect to save up to 27% on your trip compared to booking a flight 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 August 18, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Jacksonville 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.
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,981 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,925 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Jacksonville 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 Jacksonville to Ontario round-trip?

    According to our current data, Delta ($204), United Airlines ($228), and American Airlines ($311) offers the cheapest pricing from Jacksonville to Ontario. Delta is priced at 56% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

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

Discover the top 4 airlines that operate flights from Jacksonville 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$204Average$581FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$228Average$373FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$311Average$442FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$351Average$421FlexibilityNo cancel feeOn-time63%

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