HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Florida Keys

$95+ Cheap flights from Ontario (ONT) to Florida Keys

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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EYW
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Florida Keys with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Florida Keys

Keep the following information in mind while searching for Ontario to Florida Keys flight deals. Data was last updated September 11, 2025.

Round-trip from

$158
(CheapOair)

One-way from

$95
(Southwest)

Popular in

December

Cheapest in

September

Average price

$377
From Ontario to Florida Keys
Search Deals
One-way flight from Ontario to Florida Keys
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Ontario to Florida Keys

Cheapest flights from Ontario to Florida Keys
Explore the most affordable flight options available from Ontario to Florida Keys. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/71:46 pmONT - MIA
1 stop21h 37mFrontier
Mon 11/108:00 amMIA - ONT
1 stop13h 39mFrontier
Deal found 9/10$158
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/912:32 pmONT - MIA
1 stop23h 06mFrontier
Thu 10/166:00 amMIA - ONT
1 stop20h 50mFrontier
Deal found 9/11$160
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2512:28 pmONT - MIA
1 stop23h 03mFrontier
Sun 9/286:00 amMIA - ONT
1 stop28h 53mFrontier
Deal found 9/10$161
This CheapOair deal was found by Cheapflights users on 9/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:59 pmONT - MIA
1 stop24h 45mFrontier
Sat 10/46:45 amMIA - ONT
1 stop16h 09mFrontier
Deal found 9/8$163
This Frontier deal was found by Cheapflights users on 9/10. 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.
Thu 9/2512:18 pmONT - MIA
1 stop8h 09mFrontier
Fri 10/38:00 amMIA - ONT
1 stop13h 35mFrontier
Deal found 9/10$170
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:59 pmONT - MIA
1 stop24h 45mFrontier
Sat 9/276:45 amMIA - ONT
1 stop27h 38mFrontier
Deal found 9/10$172
This Frontier deal was found by Cheapflights users on 9/11. 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.
Thu 10/212:18 pmONT - MIA
1 stop8h 09mFrontier
Sat 10/115:30 pmMIA - ONT
1 stop9h 20mFrontier
Deal found 9/11$173
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/198:59 pmONT - MIA
1 stop24h 45mFrontier
Thu 9/256:00 amMIA - ONT
1 stop28h 53mFrontier
Deal found 9/10$180
This CheapOair deal was found by Cheapflights users on 9/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/61:46 pmONT - MIA
1 stop21h 37mFrontier
Sun 11/96:00 amMIA - ONT
1 stop8h 10mFrontier
Deal found 9/9$181
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:04 amONT - MIA
1 stop20h 15mFrontier
Mon 10/278:00 amMIA - ONT
1 stop11h 28mFrontier
Deal found 9/10$183
This CheapOair deal was found by Cheapflights users on 9/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1612:32 pmONT - MIA
1 stop23h 06mFrontier
Sun 10/196:00 amMIA - ONT
1 stop30h 35mFrontier
Deal found 9/11$188
This CheapOair deal was found by Cheapflights users on 9/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2312:32 pmONT - MIA
1 stop23h 06mFrontier
Sun 10/266:00 amMIA - ONT
1 stop30h 35mFrontier
Deal found 9/8$192

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Florida Keys 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 11, 2025.
Use the filters below to find and compare flights from Ontario to Florida Keys that are best for you.

Fly from

Ontario

Fly to

Florida Keys

Route

Depart

Return

Price

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 2/24

10:30 pm-10:52 am

1 stop9h 22m

Miami

Thu 2/26

6:00 am-11:38 am

1 stop8h 38m

$257

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 1/24

10:30 pm-5:20 pm

2 stops15h 50m

Miami

Sat 1/31

6:00 am-11:38 am

1 stop8h 38m

$262

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 10/7

10:00 pm-11:25 am

2 stops10h 25m

Miami

Thu 10/9

6:45 pm-11:39 pm

1 stop7h 54m

$262

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 9/30

11:55 am-12:23 am

1 stop9h 28m

Miami

Fri 10/10

6:45 pm-11:39 pm

1 stop7h 54m

$272

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Wed 2/4

10:30 pm-9:26 am

1 stop7h 56m

Miami

Sun 2/15

6:00 am-11:38 am

1 stop8h 38m

$287

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 2/7

6:00 am-12:25 am

2 stops15h 25m

Miami

Sun 2/15

6:00 am-11:38 am

1 stop8h 38m

$292

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Wed 10/1

11:55 am-12:23 am

1 stop9h 28m

Miami

Thu 10/9

6:45 pm-11:39 pm

1 stop7h 54m

$307

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Thu 9/25

11:55 am-12:23 am

1 stop9h 28m

Miami

Wed 10/1

6:30 pm-11:42 pm

1 stop8h 12m

$307

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 10/28

6:10 am-4:18 pm

1 stop7h 08m

Key West

Wed 11/5

1:23 pm-7:41 pm

1 stop9h 18m

$309

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 10/3

10:00 pm-5:08 pm

2 stops16h 08m

Miami

Tue 10/7

6:45 pm-11:39 pm

1 stop7h 54m

$320

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 34 results
1
2
3
4

Best time to book a flight from Ontario to Florida Keys

Have a flexible travel schedule? Discover the best time to fly to Florida Keys 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 Florida Keys

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Florida Keys (average of $328). Flying from Ontario to Florida Keys in March is currently the most expensive (average of $491). 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.

Reviews of airlines servicing Florida Keys

Get insights into the airlines that provide service to Florida Keys. 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 Florida Keys. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Ontario to Florida Keys by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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.
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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 Florida Keys. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Florida Keys?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Florida Keys from Ontario.

  • How long is the flight from Ontario to Florida Keys?

    Departing from Ontario to Florida Keys will take you 7h 08m. Ontario and Florida Keys are separated by a distance of 2242 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

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

  • How can I find direct flights from Ontario to Florida Keys?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Florida Keys 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 Florida Keys?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Florida Keys (average of $328). Flying from Ontario to Florida Keys in March is currently the most expensive (average of $491). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Florida Keys

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Miami flights
Los Angeles to Orlando flights
Los Angeles to Fort Lauderdale flights
San Francisco to Miami flights
San Francisco to Orlando flights
Los Angeles to Tampa flights
Ontario to Miami flights
Burbank to Fort Lauderdale flights
Ontario to Orlando flights
Santa Ana to Fort Lauderdale flights
San Francisco to Tampa flights
San Diego to Orlando flights
San Francisco to Fort Lauderdale flights
Las Vegas to Orlando flights
Santa Ana to Orlando flights
Las Vegas to Fort Lauderdale flights
San Diego to Miami flights
Ontario to Fort Lauderdale flights
Burbank to Orlando flights
Santa Ana to Miami flights
Burbank to Miami flights
Sacramento to Orlando flights
Las Vegas to Tampa flights
Las Vegas to Miami flights
San Jose to Miami flights
San Diego to Tampa flights
San Jose to Orlando flights
San Diego to Fort Lauderdale flights
Los Angeles to West Palm Beach flights
Ontario to Tampa flights
Santa Ana to Tampa flights
Sacramento to Miami flights
San Francisco to West Palm Beach flights
Sacramento to Tampa flights
Oakland to Miami flights
Burbank to Tampa flights
Sacramento to Fort Lauderdale flights
Oakland to Orlando flights
San Francisco to Fort Myers flights
San Jose to Fort Lauderdale flights
Los Angeles to Jacksonville flights
Los Angeles to Sarasota flights
San Francisco to Jacksonville flights
San Diego to Fort Myers flights
Oakland to Tampa flights
Los Angeles to Fort Myers flights
Los Angeles to Pensacola flights
Ontario to West Palm Beach flights
Fresno to Orlando flights
Oakland to Fort Lauderdale flights

Top airline flying from Ontario to Florida Keys

Discover the top airline that operate flights from Ontario to Florida Keys. 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$318Average$423FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.