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Florida Keys

$100+ 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 6/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EYW
jun. 23 — jun. 301
lun. 6/23
lun. 6/30
1 adult, Economy
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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 junio 18, 2025.

Round-trip from

$210
(FlightHub)

One-way from

$100
(Frontier)

Popular in

December

Cheapest in

September

Average price

$463
From Ontario to Florida Keys
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One-way flight from Ontario to Florida Keys
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Highest demand for flights based on searches. 9% potential increase in price ($45 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 June 2025
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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 junio 18, 2025.

This FlightHub deal was found by Cheapflights users on 6/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 7/36:00 amONT - MIA
1 stop20h 45mFrontier
mar. 7/86:00 amMIA - ONT
1 stop20h 50mFrontier
Deal found 6/17$210
This Trip.com deal was found by Cheapflights users on 6/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/27:00 amONT - MIA
1 stop11h 15mMultiple Airlines
lun. 7/78:55 pmMIA - ONT
1 stop22h 25mMultiple Airlines
Deal found 6/17$272
This Delta deal was found by Cheapflights users on 6/17. 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.
mar. 7/15:08 pmONT - MIA
1 stop10h 18mDelta
vie. 7/45:50 pmMIA - ONT
1 stop7h 24mDelta
Deal found 6/17$277
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/206:00 amONT - MIA
1 stop32h 31mAlaska Airlines
lun. 8/256:31 pmMIA - ONT
1 stop19h 13mAlaska Airlines
Deal found 6/16$298
This Southwest deal was found by Cheapflights users on 6/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/209:00 pmONT - MIA
2 stops10h 50mSouthwest
lun. 8/254:10 pmMIA - ONT
1 stop9h 45mSouthwest
Deal found 6/17$304
This United Airlines deal was found by Cheapflights users on 6/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/15:05 amONT - MIA
1 stop8h 15mUnited Airlines
sáb. 7/58:00 amMIA - ONT
1 stop7h 32mUnited Airlines
Deal found 6/17$307
This American Airlines deal was found by Cheapflights users on 6/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/1610:29 pmONT - EYW
1 stop10h 30mAmerican Airlines
sáb. 8/233:59 pmEYW - ONT
1 stop9h 49mAmerican Airlines
Deal found 6/17$309
This American Airlines deal was found by Cheapflights users on 6/18. 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.
vie. 6/2710:54 amONT - MIA
1 stop9h 05mAmerican Airlines
mié. 7/25:55 pmMIA - ONT
1 stop6h 43mAmerican Airlines
Deal found 6/18$325
This Delta deal was found by Cheapflights users on 6/16. 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.
dom. 11/2310:59 pmONT - EYW
1 stop9h 00mDelta
mié. 11/262:35 pmEYW - ONT
1 stop8h 07mDelta
Deal found 6/16$657
This United Airlines deal was found by Cheapflights users on 6/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/281:19 pmONT - EYW
2 stops20h 53mUnited Airlines
vie. 8/12:12 pmEYW - ONT
2 stops30h 13mUnited Airlines
Deal found 6/17$727

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 junio 18, 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

jue. 7/3

6:00 am-5:45 am

1 stop20h 45m

Miami

mar. 7/8

6:00 am-11:50 pm

1 stop20h 50m

$210

OntarioMiami

ONT - MIA

ONTMIA

Ontario

mié. 7/2

7:00 am-9:15 pm

1 stop11h 15m

Miami

lun. 7/7

8:55 pm-4:20 pm

1 stop22h 25m

$272

OntarioMiami

ONT - MIA

ONTMIA

Ontario

mar. 7/1

5:08 pm-6:26 am

1 stop10h 18m

Miami

vie. 7/4

5:50 pm-10:14 pm

1 stop7h 24m

$277

OntarioMiami

ONT - MIA

ONTMIA

Ontario

mié. 8/20

6:00 am-5:31 pm

1 stop32h 31m

Miami

lun. 8/25

6:31 pm-10:44 am

1 stop19h 13m

$298

OntarioMiami

ONT - MIA

ONTMIA

Ontario

mié. 8/20

9:00 pm-10:50 am

2 stops10h 50m

Miami

lun. 8/25

4:10 pm-10:55 pm

1 stop9h 45m

$304

OntarioMiami

ONT - MIA

ONTMIA

Ontario

mar. 7/1

5:05 am-4:20 pm

1 stop8h 15m

Miami

sáb. 7/5

8:00 am-12:32 pm

1 stop7h 32m

$307

OntarioKey West

ONT - EYW

ONTEYW

Ontario

sáb. 8/16

10:29 pm-11:59 am

1 stop10h 30m

Key West

sáb. 8/23

3:59 pm-10:48 pm

1 stop9h 49m

$309

OntarioMiami

ONT - MIA

ONTMIA

Ontario

sáb. 6/28

8:15 am-7:50 pm

1 stop8h 35m

Miami

mié. 7/2

5:18 am-10:04 am

1 stop7h 46m

$326

OntarioKey West

ONT - EYW

ONTEYW

Ontario

dom. 11/23

10:59 pm-10:59 am

1 stop9h 00m

Key West

mié. 11/26

2:35 pm-7:42 pm

1 stop8h 07m

$657

OntarioKey West

ONT - EYW

ONTEYW

Ontario

lun. 7/28

1:19 pm-1:12 pm

2 stops20h 53m

Key West

vie. 8/1

2:12 pm-5:25 pm

2 stops30h 13m

$727

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 19 results
1
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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 $493). 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.

Rainfall in Florida Keys by month

Plan your trip to Florida Keys by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Florida Keys ranges from 1.6 - 9.9 inches per month. September is typically the wettest month, when rainfall can reach 9.9 in. January is typically the driest time to visit Florida Keys when rainfall is around 1.6 in.

Temperature in Florida Keys by month

Plan your trip to Florida Keys by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Florida Keys, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 68.0 F).

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 junio 18, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Ontario to Florida Keys. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,280 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,810 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    The cheapest airlines for a one-way flight from Ontario to Florida Keys are Frontier ($100), Delta ($139), and United Airlines ($145).

  • 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 $493). 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

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Top 2 airlines flying from Ontario to Florida Keys

Discover the top 2 airlines 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 junio 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$308Average$508FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$378Average$498FlexibilityNo cancel feeOn-time71%

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