$94 Find Cheap Flights from Ontario to Florida Keys

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 Florida Keys departing on 6/3. 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.
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KAYAK searches hundreds of travel sites at once for deals on flights to Florida Keys

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Florida Keys.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Florida Keys.
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Best Florida Keys Flight Deals from Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Miami
Miami1 stop$208
Key West
Key West2 stops$570
Miami
Miami1 stop$208
Key West
Key West2 stops$570

Cheap Flights from Ontario to Florida Keys

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Florida Keys 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.

Recent round-trip flight deals from Ontario to Florida Keys

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Ontario to Florida Keys.
Discover the best prices for you by selecting your travel dates on KAYAK.
Frontier Logo
5:21 pm - 6:30 amONT-MIA
10h 09m1 stop
Frontier Logo
7:10 am - 4:20 pmMIA-ONT
12h 10m1 stop
$208Frontier
Find Deal
Wed, May 28 - Sat, May 31
Frontier Logo
12:59 am - 5:22 amONT-MIA
25h 23m1 stop
Frontier Logo
6:00 am - 9:15 amMIA-ONT
30h 15m1 stop
$210Frontier
Find Deal
Fri, May 16 - Sat, May 24
United Airlines Logo
6:41 pm - 7:30 amONT-MIA
9h 49m1 stop
United Airlines Logo
4:50 pm - 9:10 pmMIA-ONT
7h 20m1 stop
$332United Airlines
Find Deal
Tue, Jun 3 - Thu, Jun 5
Delta Logo
10:05 pm - 10:57 amONT-MIA
9h 52m1 stop
Delta Logo
2:12 pm - 7:20 pmMIA-ONT
8h 08m1 stop
$337Delta
Find Deal
Tue, Jul 1 - Tue, Jul 15
Delta Logo
12:18 pm - 12:37 amONT-MIA
9h 19m1 stop
Delta Logo
7:00 am - 11:08 amMIA-ONT
7h 08m1 stop
$338Delta
Find Deal
Thu, May 29 - Thu, Jun 5
American Airlines Logo
12:55 pm - 11:59 pmONT-MIA
8h 04m1 stop
American Airlines Logo
5:18 am - 10:04 amMIA-ONT
7h 46m1 stop
$356American Airlines
Find Deal
Mon, Jun 23 - Sat, Jun 28
Southwest Logo
8:35 am - 9:40 pmONT-MIA
10h 05m2 stops
Southwest Logo
12:35 pm - 10:30 pmMIA-ONT
12h 55m1 stop
$367Southwest
Find Deal
Tue, Sep 2 - Thu, Sep 11
American Airlines Logo
12:49 pm - 12:45 amONT-MIA
8h 56m1 stop
American Airlines Logo
5:18 am - 10:01 amMIA-ONT
7h 43m1 stop
$401American Airlines
Find Deal
Fri, Jun 27 - Sun, Jul 13
Southwest Logo
9:00 am - 9:55 pmONT-MIA
9h 55m2 stops
Southwest Logo
2:40 pm - 9:00 pmMIA-ONT
9h 20m2 stops
$417Southwest
Find Deal
Wed, Jun 11 - Tue, Jun 24
United Airlines Logo
6:00 am - 3:51 pmONT-MIA
6h 51m1 stop
United Airlines Logo
4:16 pm - 10:11 pmMIA-ONT
8h 55m1 stop
$437United Airlines
Find Deal
Sun, Jul 6 - Wed, Jul 16
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KAYAK's insights & trends for Ontario to Florida Keys flights

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

What is the cheapest month to fly from Ontario to Florida Keys?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Florida Keys, 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 Florida Keys is September, when tickets cost $289 (return) on average. On the other hand, the most expensive months are December and March, when the average cost of round-trip tickets is $541 and $512 respectively.

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

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

Your flight ticket price will generally be cheaper if you fly to Florida Keys on a Wednesday and more expensive on a Friday. On your return trip to Ontario, you should consider flying back on a Thursday, and avoid Sundays for better deals.

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

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 Florida Keys, 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 Florida Keys, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.


Good to know

Low seasonJanuary
High seasonJune
Cheapest flight$94
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 3% increase in price.
Flight from Ontario to Miami

FAQs - booking Florida Keys flights

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

    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 Florida Keys.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Florida Keys 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 Florida Keys?

    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 from Ontario to Florida Keys with an airline and back with another airline.

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

    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 from Ontario to Florida Keys up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Florida Keys?

    The cheapest time of day to fly to Florida Keys is generally in the evening, when round-trip flights cost $326 on average. Morning departures are around 20% more expensive than evening flights, on average. The most expensive time of day to fly to Florida Keys is generally in the morning, which is peak travel time and where the average cost of a ticket is $396.

Top 5 airlines serving from Ontario to Florida Keys

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Florida Keys. 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 Florida Keys? 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 4292 reviews
7.6Entertainment
8.0Comfort
8.2Boarding
8.6Crew
7.1Food
Airline reviews

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

8.0 ExcellentJohn, Apr 2025PVD - FLL
Read more Southwest reviews

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

Plz don't take away free bags and free seating

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Great flight staff. Ease of boarding. Overall, very uneventful and easy trip.

Excellent! Only question is how we check in at exactly 24 hours in advance and end up at the end of the B boarding group

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

I recently flew Southwest from San Jose to Honolulu. I was very impressed with the flight crew, especially the flight attendant in charge of the front of the plane. She came through the aisle at least five times for drinks and water, and two times for snacks. I have not seen such service since I flew first class. Also, for the first time, they gave us the correct baggage claim number, and the luggage came out quickly. I can't wait for Southwest to have assigned seating! I absolutely hate the Cattle Call boarding procedure and the mad dash to get seats and overhead bins. However, the boarding was efficient.

It went well. Plane wasn't full. Will be great when assigned seating is in place

Crew was friendly Love the entertainment in the seat head rest.

Delta flight was on time, seats were comfortable, and crew was nice.

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

Other then mechanical/ computer problem and 3.5 hours flight delay the flight was great. I guess that what happened when you fly an old airplane now a day.

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

I actually received a notification from kayak on email but not one by text from Delta when my departure gait changed and I almost missed my flight

Don't waste your money or points on first class. Delta first class is a joke. The seats were rickety, the food was awful, and nothing worked, wifi, my light, the power plug - and it was dirty - the fold out table was gross. For 2-3 hours, tough it out in Economy.

New boarding doesn't make sense. Filling front first is slow.

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

The gate was too far away for the connecting flight

Compared with other carriers business class for an overnight was not worth the extra expense.

Easy to board. Flight was super crowded though so I didn't sleep well on that cross country red-eye flight. The aisles seem ot have gotten narrower and the seat smaller whn luggage and people are getting bigger so it would be AWESOME to have more space and breathing room in general ;)

Pilot Erika DeLong made us feel safe and at ease in a frankly scary time to be flying. Her warm smile and greeting and excellent command of the aircraft in foggy bumpy weather helped us all to calm our nerves and get us home safely.

The tv monitor in front of my seat was not responding. The flight crew reset it and it still didn’t work.

Plenty of room for me and the cat in Premium Economy. Seat was comfortable. Boarding was a breeze. The lady at the special check-in desk was great, super helpful and professional.

Our seats were all the way in back of the plane,

Maybe add a seat trade app for flyers that didn’t get seats together

The flight attendants in First Class were mediocre at best. They did not take our tray away until we were about to land and only did so when I press the call button. The United person at the United Club was asked to get us our boarding pass since we missed the flight due in Chicago. She argued that we did not have seats on the flight given to us in Moline. Furthermore, she was adamant that we did not have a First Class ticket. After I spent much time with her trying to show we were correct, she reluctantly agreed. She was probably the most incompetent ticketing person I have ever met and I have traveled 3 million miles on United plus many additional miles with other carriers. United has definitely deteriorated in more than on way.

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

Would have thought that they would gas up plane before everyone got on board

Fine. On time, cabin service was fine, bag arrived. All good. Flying into DCA so did not collide with any helicopters, which is also good. Horrid incident that could have and should have been prevented.

Standard. No different than a discount carrier on a short trip.

The flights were terribly delayed and then cancelled which forced us booking another night at the hotel. Very poor management from American Airlines

Crew was late. Baggage was late. 2hs inside the plane waiting fro de-icing and traffic. A 3:30hs flight ended up being almost 6hs inside the airplane.

Checking in at the counter was very disappointing. The lady had a very bad attitude and smart at me. She had no smile, did not greet me by name, or acknowledge me as a valued customer. Poor reflection of the airline.

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

I was pleasantly surprised with an upgrade at boarding. I finally had a mostly gluten free food options and a very attentive attendant.

Very poor. Our special services attendant gave us incorrect information. I also was mishandled at landing. There was no wheelchair waiting. I fell deboarding the plane. Appalling!

Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.

I chose the seats when booked the flight and paid for them. However after checking in I found we were assigned different seats!

It was a no frills flight. Would have liked to be able to charge my device

Seats were extremely uncomfortable and it was very hot on the plane.

Since they are a budget airline, I wasn’t expecting too much but they did some things well. They were on time, the plane was clean, boarding was fairly straightforward and the staff was cheerful and friendly. The only downside was comfort. The seats were fairly hard and after a 2 hour flight your rear end is not feeling so great. Maybe a little more cushion in the seats, Frontier!

Check in at Philadelphia international was absolutely terrible! I fly 2 to 3 times a month and avoid frontier at all cost and will never fly Frontier again! The night before travel, I tried checking in however, the app was giving me an error, so I went to the desktop, which instructed you that you need to use the app. The next day I presented at the check-in gate after trying at least a half dozen times prior to getting into the airport and continuing to getting the error in the app. I actually had rebooted my phone numerous times and reinstall the app just in case. My phone is only one generation older than the current model. It has no problems completing a frontier flight purchase or any other app issues. There was only three frontier employees working at check-in and a huge line while I was in line I continued to try and check in via the app. As I approach the desk, I was dreading dealing with the agent. He was extremely unprofessional, anti-semantic & very ignorant, and mean to the people in front of me, as well as the people who ended up being behind me. He literally told people “Man I don’t care bout y’all” in his native dialect! Maintaining my composure I approached and explained the situation. To which he replied, you’re gonna have to pay then! I don’t understand. It’s an issue with their app not allowing me to check in! Not my issue! He told me if I pay cash it would be $15, $25 if I pay credit card. I don’t understand a $10 difference for paying with a credit card? I am completely cashless so I continued to try using the app to avoid the $25 fee, Which I still don’t believe that I should be responsible for since it was Frontier’s technical issue!!! I continued to check in via the app a couple more times after he verified I was doing everything right he proceeded to continue to belittle the people behind me. Yelling at them saying I don’t care about you people! I cannot believe that this is the way that businesses would treat its customers! Unfortunately, the black mail with dreadlocks did not have a name tag all he had was a frontier sweater on! For the $25 fee that I ended up getting charged on my credit card. I should’ve just booked originally with Spirit or any other carrier! I have no problem paying fees that I should be responsible for, but when it’s due to a technical failure of a company, the customer should not be responsible for it! I cannot believe that it’s not frontier going out of business!

they delayed my flight which ended up, causing my layover flight to leave without me, resulting in me missing a flight and having to stay overnight in Houston international. I got no compensation other than a flight to my original location only a day later. i’ve never experienced such a unprofessional situation

Our flight was suppose to leave at 9pm and we didn’t board until after 3am. We lost a whole day at our hotel and half a day at a park we paid a lot of money for.

Boarding was organized and flight was on time. Overall very satisfied with my flight.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

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