ONT - JAX

$137 Find Cheap Flights from Ontario to Jacksonville

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Jacksonville departing on 10/22. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Jacksonville

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Jacksonville, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Jacksonville, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Ontario to Jacksonville (ONT-JAX)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Jacksonville that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Jacksonville

Sun, Oct 26 - Sun, Nov 2
Frontier Logo
4:17 pm - 10:52 amONT-JAX
15h 35m1 stop
Frontier Logo
11:07 am - 7:29 amJAX-ONT
23h 22m1 stop
$306Frontier
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Tue, Oct 21 - Sat, Oct 25
United Airlines Logo
1:15 pm - 11:15 pmONT-JAX
7h 00m1 stop
United Airlines Logo
8:15 am - 12:51 pmJAX-ONT
7h 36m1 stop
$320United Airlines
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Tue, Oct 21 - Sat, Oct 25
United Airlines Logo
5:05 am - 3:13 pmONT-JAX
7h 08m1 stop
United Airlines Logo
11:55 am - 8:24 pmJAX-ONT
11h 29m2 stops
$325United Airlines
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Tue, Oct 21 - Sat, Oct 25
American Airlines Logo
10:09 am - 11:11 pmONT-JAX
10h 02m2 stops
American Airlines Logo
11:06 am - 7:03 pmJAX-ONT
10h 57m2 stops
$330American Airlines
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Thu, Nov 27 - Sat, Dec 13
Delta Logo
7:05 am - 4:23 pmONT-JAX
6h 18m1 stop
Delta Logo
5:33 pm - 10:05 pmJAX-ONT
7h 32m1 stop
$340Delta
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Sat, Oct 25 - Mon, Nov 3
American Airlines Logo
12:47 pm - 9:58 pmONT-JAX
6h 11m1 stop
American Airlines Logo
12:55 pm - 7:41 pmJAX-ONT
9h 46m1 stop
$359American Airlines
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Tue, Mar 3 - Wed, Mar 4
Delta Logo
10:30 pm - 10:22 amONT-JAX
8h 52m1 stop
Delta Logo
3:45 pm - 9:14 pmJAX-ONT
8h 29m1 stop
$370Delta
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Fri, Nov 14 - Sun, Nov 16
Southwest Logo
12:35 pm - 11:10 pmONT-JAX
7h 35m1 stop
Southwest Logo
5:35 am - 12:30 pmJAX-ONT
9h 55m2 stops
$422Southwest
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Thu, Nov 20 - Fri, Nov 28
Southwest Logo
6:30 am - 5:00 pmONT-JAX
7h 30m1 stop
Southwest Logo
5:35 am - 3:35 pmJAX-ONT
13h 00m1 stop
$463Southwest
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Tue, Oct 14 - Fri, Oct 24
JetBlue Logo
10:56 pm - 4:17 pmONT-JAX
14h 21m1 stop
JetBlue Logo
11:30 am - 9:29 pmJAX-ONT
12h 59m1 stop
$468JetBlue
Find Deal

Everything you should know

Top airlines
Frontier
Cheapest • from $306 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 28% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
July
Cheapest • 11% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$306
Overall average: $410
Frontier
Sun 10/26Sun 11/2
ONT - JAX • 1 stop
Cheapest one-way
$137
Typical prices: $224-306
Frontier
Wed 10/22
ONT - JAX • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Jacksonville!
Booking Insights

KAYAK's insights & trends for Ontario to Jacksonville flights

Get data-powered insights and trends into flights from Ontario to Jacksonville to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Ontario to Jacksonville?

The average price of all round-trip flights from Ontario to Jacksonville clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Jacksonville on a Thursday and more expensive on a Sunday. On your return trip to Ontario, you should consider flying back on a Tuesday, and avoid Mondays for better deals.

What is the cheapest month to fly from Ontario to Jacksonville?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Jacksonville, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Jacksonville is July, where tickets cost $406 (return) on average. On the other hand, the most expensive months are March and August, where the average cost of round-trip tickets is $549 and $539 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Jacksonville, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Jacksonville, you should book around 4 weeks before departure, which saves you about 28% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Good to know

Low seasonJune
Cheapest flight$137
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 20% increase in price.
Flight from Ontario to Jacksonville

When to book flights from Ontario to Jacksonville

Are your dates flexible? Find out the best times to travel from Ontario to Jacksonville based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Jacksonville

  • What is the cheapest flight from Ontario to Jacksonville?

    In the last 3 days, the lowest price for a flight from Ontario to Jacksonville was $137 for a one-way ticket and $306 for a round-trip.

  • Do I need a passport to fly between Ontario and Jacksonville?

    No, a passport isn't needed to fly from Ontario to Jacksonville. However, local authorities might ask for an official ID.

  • Which aircraft models fly most regularly from Ontario to Jacksonville?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Jacksonville?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Ontario and Jacksonville, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Jacksonville, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Jacksonville are Southwest and Delta. With an average price for the route of $428 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $450 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Ontario to Jacksonville?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Jacksonville.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Jacksonville?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Jacksonville from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Jacksonville?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Jacksonville with an airline and back to Ontario with another airline. Booking your flights between Ontario and JAX can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Jacksonville?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Jacksonville from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Ontario to Jacksonville

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Jacksonville. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Jacksonville? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4246 reviews
8.6Crew
7.5Entertainment
8.1Boarding
8.0Comfort
7.0Food
Airline reviews

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

10.0 ExcellentRobert, Sep 2025SFO - LAS
Read more Southwest reviews

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

The quality of Southwest Airlines continues to degrade each time I fly with them. If it were not for the free luggage, I would probably choose another airline. Their prices are a little bit competitive, but way too high for the quality of the service. Southwest is not unique in this way. Domestic flight in the United States of America has continued to be a lower and lower quality product. Very sad when you compare the quality of domestic airlines to that of many international airlines around the world.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

I'm not a fan of Southwest's model. I don't like the herding style of boarding.

It is southwest seat was ok. Not the most comfortable seat

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

Always good but we must do something about people in rows ahead of you that don't put their seats back up when they are suppose to. And It's rough to not be able to even lean over to get something out of my purse.

this crew didn't care much. bumping carts into seats more times than i care to remember

Everything was fine except the entertainment was not working for half of the flight.

Easy boarding with an extremely kind attendant. Seats were spacious and we had 3 seats for 2 people so we could stretch out. Comfortable air flow and very attentive and hospital attendants. Bathrooms and food were the only negative. Bathrooms were so small you could hardly get in and close the door. I don’t think an obese person would fit or a person with a movement disability. Food was the trending food for flights, nonexistent. We spent $40 getting sandwich and snack at airport for our 6 hour flught.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

Boarded plane and then delayed 1.5 hours while on the plane

We didn't take off until an hour after we boarded.

Wish they had the seat-back video screens for watching movies or playing games.

Very good but wish they had the seat-back video screens for movies & games

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

While waiting to claim my checked luggage, I discovered the airline had lost it. After a long wait and inquiries, I discovered it was on another flight. Fortunately, the airline finally sent my luggage home.

Flight delays numerous times. Everytime we would get close to boarding it would be delayed again. Strung along the entire time.

This flight never occurred because AA couldn’t get their act together.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

During service there was a garbage/beverage spill near our seats that never was cleaned up. On a relatively short flight when we’re fortunate enough to actually have in flight movies available, the flight attendants pitching the AADVANTAGE credit card shouldn’t talk for the last 10 minutes of the flight so that we miss the end of the movie.

Waited on the runway for takeoff for 2.5 hours. Air traffic rerouted us. The plane didn't have enough fuel, so had to go back to the gate. Had to wait for a new pilot. Should have landed at 5:22. Didn't land until 9:10. Trash flight.

Everything you need to know for your flight from Ontario to Jacksonville

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