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$159+ Cheap flights from Ontario to Jacksonville (ONT - JAX)

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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — JAX
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Jacksonville are usually found in November or July, booked 5 days in advance, depart on a Thursday or Monday and return on a Tuesday

Cheap flight deals from Ontario to Jacksonville

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Jacksonville (JAX). 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 September 17, 2025.

Round-trip from

$225
(Frontier)

One-way from

$159
(Delta)

Popular in

March

Cheapest in

November

Average price

$416
From Ontario to Jacksonville
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One-way flight from Ontario to Jacksonville
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Highest demand for flights based on searches. 6% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Jacksonville

Cheapest flights from Ontario to Jacksonville
Explore the most affordable flight options available from Ontario to Jacksonville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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 11/108:24 amONT - JAX
1 stop6h 45mFrontier
Sat 11/1510:38 pmJAX - ONT
2 stops19h 07mFrontier
Deal found 9/15$225
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1811:45 amONT - JAX
1 stop8h 19mDelta
Wed 12/35:10 amJAX - ONT
1 stop8h 30mDelta
Deal found 9/15$317
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/151:00 pmONT - JAX
1 stop6h 58mAmerican Airlines
Wed 10/2212:54 pmJAX - ONT
2 stops9h 09mAmerican Airlines
Deal found 9/15$329
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/157:05 amONT - JAX
1 stop6h 23mDelta
Wed 12/35:10 amJAX - ONT
1 stop8h 30mDelta
Deal found 9/15$334
This Delta deal was found by Cheapflights users on 9/16. 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.
Tue 11/1811:45 amONT - JAX
1 stop8h 19mDelta
Tue 12/24:02 pmJAX - ONT
1 stop10h 01mDelta
Deal found 9/16$338
This Frontier deal was found by Cheapflights users on 9/15. 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 10/108:34 amONT - JAX
2 stops23h 17mFrontier
Mon 10/1311:37 amJAX - ONT
2 stops15h 13mFrontier
Deal found 9/15$339
This Delta deal was found by Cheapflights users on 9/17. 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.
Wed 11/57:35 amONT - JAX
2 stops13h 24mDelta
Mon 11/104:01 pmJAX - ONT
2 stops10h 51mDelta
Deal found 9/17$344
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/187:05 amONT - JAX
1 stop7h 28mDelta
Fri 12/56:38 pmJAX - ONT
1 stop7h 25mDelta
Deal found 9/15$348
This Delta deal was found by Cheapflights users on 9/14. 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.
Thu 12/410:25 pmONT - JAX
1 stop7h 16mDelta
Sat 12/65:33 pmJAX - ONT
1 stop7h 31mDelta
Deal found 9/14$351
This Delta deal was found by Cheapflights users on 9/16. 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 11/157:05 amONT - JAX
1 stop6h 23mDelta
Tue 12/24:02 pmJAX - ONT
1 stop10h 01mDelta
Deal found 9/16$355

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Jacksonville 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 September 17, 2025.
Use the filters below to find and compare flights from Ontario to Jacksonville that are best for you.

Fly from

Ontario

Fly to

Jacksonville

Route

Depart

Return

Price

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Tue 11/18

11:45 am-11:04 pm

1 stop8h 19m

Jacksonville

Wed 12/3

5:10 am-10:40 am

1 stop8h 30m

$317

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Sat 11/15

11:45 am-8:39 pm

1 stop5h 54m

Jacksonville

Wed 12/3

5:10 am-10:40 am

1 stop8h 30m

$334

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Wed 11/5

7:35 am-11:59 pm

2 stops13h 24m

Jacksonville

Mon 11/10

6:38 pm-11:04 pm

1 stop7h 26m

$339

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Thu 10/9

1:15 pm-11:15 pm

1 stop7h 00m

Jacksonville

Sat 10/11

8:15 am-12:51 pm

1 stop7h 36m

$351

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Thu 12/4

10:25 pm-8:41 am

1 stop7h 16m

Jacksonville

Sat 12/6

5:33 pm-10:04 pm

1 stop7h 31m

$351

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Sat 11/15

7:05 am-4:28 pm

1 stop6h 23m

Jacksonville

Tue 12/2

4:02 pm-11:03 pm

1 stop10h 01m

$355

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Wed 11/19

7:05 am-7:03 pm

1 stop8h 58m

Jacksonville

Tue 12/2

4:02 pm-11:03 pm

1 stop10h 01m

$359

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Wed 11/5

8:30 am-9:05 pm

2 stops9h 35m

Jacksonville

Mon 11/10

3:00 pm-10:05 pm

2 stops10h 05m

$361

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Mon 11/3

8:24 am-6:09 pm

1 stop6h 45m

$162

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Tue 9/30

8:59 pm-11:43 am

2 stops35h 44m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 19 results
1
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Best time to book a flight from Ontario to Jacksonville

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Jacksonville. Price data was last updated on September 12, 2025.

Booking 4 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Jacksonville. 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 Ontario to Jacksonville?

Currently, August is the cheapest month in which you can book a flight from Ontario to Jacksonville (average of $278). Flying from Ontario to Jacksonville in March is currently the most expensive (average of $365). 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 ONT to JAX?

Find hourly flight availability from Ontario to Jacksonville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

It’s optimal to fly from Ontario to Jacksonville in the afternoon. By choosing this option you can save up to 10% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Jacksonville

Get insights into the airlines that provide service to Jacksonville. 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 Jacksonville. Reviews last updated September 17, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Ontario to Jacksonville have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

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
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

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
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

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
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

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 Ontario to Jacksonville. 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 Ontario to Jacksonville?

    There are many flights that can get you from Ontario to Jacksonville in 7h. Fly via Delta or United Airlines to get the fastest option. Airlines will cover a distance of 2100 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Ontario to Jacksonville round-trip?

    Flying on Delta is currently your cheapest option to Jacksonville, with prices starting at $306. Additional round-trip tickets that might be worth considering are offered by American Airlines and Southwest, with the lowest prices starting at $326 and $342, respectively. These flights start at 31% lower than the current average price 3 months from now.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Ontario to Jacksonville (average of $278). Flying from Ontario to Jacksonville in March is currently the most expensive (average of $365). 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

Traveling to a place near Jacksonville?

Book flights to Jacksonville if you plan to visit one of these locations
Jacksonville Beach
Orange Park
Kingsland
Fernandina Beach
Waycross

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Top 4 airlines flying from Ontario to Jacksonville

Discover the top 4 airlines that operate flights from Ontario to Jacksonville. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$306Average$450FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$326Average$438FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$342Average$416FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$362Average$518FlexibilityNo cancel feeOn-time69%

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