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$139+ 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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — JAX
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Jacksonville are usually found in July or May, 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 August 14, 2025.

Round-trip from

$253
(American Airlines)

One-way from

$139
(Delta)

Popular in

March

Cheapest in

July

Average price

$539
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 ($28 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 August 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 August 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2510:09 amONT - JAX
1 stop9h 45mAmerican Airlines
Sat 11/17:55 amJAX - ONT
1 stop13h 40mAmerican Airlines
Deal found 8/14$253
This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/236:10 amONT - JAX
1 stop13h 34mAmerican Airlines
Thu 9/254:31 pmJAX - ONT
1 stop8h 45mAmerican Airlines
Deal found 8/14$285
This American Airlines deal was found by Cheapflights users on 8/13. 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 10/48:15 amONT - JAX
2 stops12h 02mAmerican Airlines
Tue 10/77:55 amJAX - ONT
1 stop10h 29mAmerican Airlines
Deal found 8/13$290
This Delta deal was found by Cheapflights users on 8/13. 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.
Fri 9/1910:00 pmONT - JAX
1 stop9h 05mDelta
Tue 9/232:30 pmJAX - ONT
1 stop7h 45mDelta
Deal found 8/13$307
This Delta deal was found by Cheapflights users on 8/14. 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.
Sat 9/207:05 amONT - JAX
1 stop5h 58mDelta
Mon 9/226:37 pmJAX - ONT
1 stop6h 46mDelta
Deal found 8/14$317
This Delta deal was found by Cheapflights users on 8/14. 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.
Mon 9/1510:00 pmONT - JAX
1 stop9h 12mDelta
Mon 9/226:37 pmJAX - ONT
1 stop6h 46mDelta
Deal found 8/14$319
This American Airlines deal was found by Cheapflights users on 8/13. 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.
Thu 9/181:10 pmONT - JAX
1 stop6h 34mAmerican Airlines
Sun 9/217:17 amJAX - ONT
1 stop7h 38mAmerican Airlines
Deal found 8/13$327
This Delta deal was found by Cheapflights users on 8/14. 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.
Sun 9/1410:00 pmONT - JAX
1 stop7h 36mDelta
Sun 9/216:37 pmJAX - ONT
1 stop6h 46mDelta
Deal found 8/14$337
This American Airlines deal was found by Cheapflights users on 8/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2910:09 amONT - JAX
1 stop9h 45mAmerican Airlines
Sun 11/29:11 amJAX - ONT
1 stop7h 52mAmerican Airlines
Deal found 8/14$345
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1712:59 amONT - JAX
2 stops14h 04mFrontier
Fri 8/2210:56 pmJAX - ONT
2 stops20h 15mFrontier
Deal found 8/14$347

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 August 14, 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

Sat 10/25

10:09 am-10:54 pm

1 stop9h 45m

Jacksonville

Sat 11/1

7:55 am-6:35 pm

1 stop13h 40m

$253

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Tue 9/23

6:10 am-10:44 pm

1 stop13h 34m

Jacksonville

Thu 9/25

4:31 pm-10:16 pm

1 stop8h 45m

$285

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Sat 10/4

10:35 pm-9:10 am

1 stop7h 35m

Jacksonville

Tue 10/7

7:55 am-6:35 pm

1 stop13h 40m

$285

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Fri 9/19

10:00 pm-10:05 am

1 stop9h 05m

Jacksonville

Tue 9/23

2:30 pm-7:15 pm

1 stop7h 45m

$307

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Fri 9/26

10:00 pm-10:05 am

1 stop9h 05m

Jacksonville

Tue 9/30

7:20 am-10:42 am

1 stop6h 22m

$307

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Sat 9/20

7:05 am-4:03 pm

1 stop5h 58m

Jacksonville

Mon 9/22

6:37 pm-10:23 pm

1 stop6h 46m

$317

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Mon 9/15

10:00 pm-10:12 am

1 stop9h 12m

Jacksonville

Mon 9/22

6:37 pm-10:23 pm

1 stop6h 46m

$319

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Sat 10/25

5:50 pm-8:59 am

2 stops12h 09m

Jacksonville

Sat 11/1

11:39 am-7:19 pm

2 stops10h 40m

$327

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Tue 12/30

10:29 pm-10:04 am

1 stop8h 35m

$139

OntarioJacksonville

ONT - JAX

ONTJAX

Ontario

Tue 12/30

8:06 pm-8:34 am

2 stops9h 28m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 15 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 August 8, 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 August 14, 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 August 14, 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
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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
4,244 reviews

Overall

8.0

Entertainment

7.5

Comfort

8.0

Boarding

8.1

Crew

8.6

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 Ontario to Jacksonville. 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 Ontario to Jacksonville round-trip?

    Flying on Delta is currently your cheapest option to Jacksonville, with prices starting at $296. 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 34% lower than the current average price 3 months from now.

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

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $139. However, be on the lookout for offers from American Airlines and Frontier, as they are both options that can get you from Ontario to Jacksonville for a low price.

  • 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$296Average$450FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$326Average$429FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$342Average$426FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$416Average$566FlexibilityNo cancel feeOn-time69%

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