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$90+ Cheap flights from Ontario to Miami (ONT - MIA)

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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MIA
Oct 19 — Oct 261
Sun 10/19
Sun 10/26
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Miami are usually found in September or August, booked 74 days in advance, depart on a Wednesday or Thursday and return on a Thursday

Cheap flight deals from Ontario to Miami

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Miami (MIA). 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 September 19, 2025.

Round-trip from

$158
(CheapOair)

One-way from

$90
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$344
From Ontario to Miami
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One-way flight from Ontario to Miami
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Highest demand for flights based on searches. 10% potential increase in price ($51 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Miami

Cheapest flights from Ontario to Miami
Explore the most affordable flight options available from Ontario to Miami. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 19, 2025.

This CheapOair deal was found by Cheapflights users on 9/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:46 pmONT - MIA
1 stop21h 44mFrontier
Mon 11/38:00 amMIA - ONT
1 stop13h 49mFrontier
Deal found 9/16$158
This CheapOair deal was found by Cheapflights users on 9/17. 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 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 44mFrontier
Sun 11/168:25 amMIA - ONT
1 stop9h 20mFrontier
Deal found 9/17$160
This CheapOair deal was found by Cheapflights users on 9/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/212:28 pmONT - MIA
1 stop23h 03mFrontier
Sun 10/56:00 amMIA - ONT
1 stop28h 53mFrontier
Deal found 9/17$161
This Gotogate deal was found by Cheapflights users on 9/17. 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 Gotogate 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
Thu 10/306:00 amMIA - ONT
1 stop8h 10mFrontier
Deal found 9/17$162
This CheapOair deal was found by Cheapflights users on 9/17. 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 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 9/17$163
This CheapOair deal was found by Cheapflights users on 9/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/308:59 pmONT - MIA
1 stop24h 45mFrontier
Sat 10/46:45 amMIA - ONT
1 stop16h 09mFrontier
Deal found 9/18$180
This SmartFares deal was found by Cheapflights users on 9/18. 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 SmartFares 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 9/18$181
This CheapOair deal was found by Cheapflights users on 9/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:04 amONT - MIA
1 stop20h 15mFrontier
Mon 10/208:00 amMIA - ONT
1 stop11h 28mFrontier
Deal found 9/18$192
This Cheapflightsfares deal was found by Cheapflights users on 9/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/307:39 amONT - MIA
1 stop7h 30mFrontier
Sat 11/86:00 amMIA - ONT
1 stop8h 10mFrontier
Deal found 9/17$193
This CheapOair deal was found by Cheapflights users on 9/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:04 amONT - MIA
1 stop20h 15mFrontier
Sat 10/255:30 pmMIA - ONT
1 stop9h 20mFrontier
Deal found 9/17$194
This Frontier deal was found by Cheapflights users on 9/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/248:34 amONT - MIA
1 stop13h 16mFrontier
Sat 11/16:00 amMIA - ONT
1 stop8h 10mFrontier
Deal found 9/17$196
This CheapOair deal was found by Cheapflights users on 9/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/308:59 pmONT - MIA
1 stop24h 45mFrontier
Fri 10/38:00 amMIA - ONT
1 stop13h 35mFrontier
Deal found 9/17$197

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Miami 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 19, 2025.
Use the filters below to find and compare flights from Ontario to Miami that are best for you.

Fly from

Ontario

Fly to

Miami

Route

Depart

Return

Price

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Mon 12/15

10:25 pm-9:27 am

1 stop8h 02m

Miami

Wed 12/24

11:45 am-10:36 pm

2 stops13h 51m

$320

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Thu 10/2

10:00 pm-10:51 am

1 stop9h 51m

Miami

Wed 10/8

6:00 am-10:26 am

1 stop7h 26m

$327

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 9/30

7:05 am-6:33 pm

1 stop8h 28m

Miami

Wed 10/8

6:45 pm-11:39 pm

1 stop7h 54m

$327

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 11/1

11:36 am-12:29 am

1 stop9h 53m

Miami

Wed 11/5

6:00 am-3:53 pm

2 stops12h 53m

$332

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sun 11/9

10:25 pm-4:31 pm

2 stops15h 06m

Miami

Fri 11/14

4:52 pm-11:52 pm

2 stops10h 00m

$337

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Wed 10/1

9:55 am-12:23 am

2 stops11h 28m

Miami

Thu 10/2

12:25 pm-10:23 pm

2 stops12h 58m

$337

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 10/3

10:00 pm-10:46 am

1 stop9h 46m

Miami

Thu 10/9

6:00 am-10:26 am

1 stop7h 26m

$344

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 10/4

11:55 am-12:23 am

1 stop9h 28m

Miami

Sun 10/5

6:00 am-10:42 am

1 stop7h 42m

$352

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 10/21

5:50 pm-4:57 pm

2 stops20h 07m

Miami

Tue 10/28

6:00 am-10:26 am

1 stop7h 26m

$355

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Thu 10/2

10:00 pm-10:51 am

1 stop9h 51m

Miami

Tue 10/7

7:00 am-10:22 pm

2 stops18h 22m

$355

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 22 results
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2
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Best time to book a flight from Ontario to Miami

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

How far ahead should I book a flight from Ontario to Miami?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Miami. Price data was last updated on September 12, 2025.

Booking 74 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Miami. 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 Miami?

Currently, September is the cheapest month in which you can book a flight from Ontario to Miami (average of $232). Flying from Ontario to Miami in March is currently the most expensive (average of $289). 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 MIA?

Find hourly flight availability from Ontario to Miami. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 19, 2025.

One of the essential ways to save on airfare from Ontario to Miami is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 18% on airfare.

Reviews of airlines servicing Miami

Get insights into the airlines that provide service to Miami. 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 Miami. Reviews last updated September 19, 2025.
Read through reviews of airlines operating flights from Ontario to Miami, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

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
7,964 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

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
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

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
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

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.
Frontier
5.8
Fair
3,171 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Comfort

8.0

Overall

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

  • How long is the flight from Ontario to Miami?

    There are many flights that can get you from Ontario to Miami in 8h 02m. Fly via Delta to get the fastest option. The distance from Ontario to Miami is about 2291 mi.

  • What are the cheapest airlines flying from Ontario to Miami round-trip?

    Flying on Frontier is currently your cheapest option to Miami, with prices starting at $150. Additional round-trip tickets that might be worth considering are offered by Delta and American Airlines, with the lowest prices starting at $296 and $324, respectively. Frontier is 65% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $167 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on United Airlines and Alaska Airlines, with prices starting from $169 and $172, respectively.

  • Where are the most common layover locations when flying from Ontario to Miami?

    The most popular layover on flights from Ontario to Miami is Phoenix.

  • What are some popular things to do or see while on a layover in Phoenix?

    Chase Field, Desert Ridge Marketplace, and Heritage Square are the most popular attractions in Phoenix if you're in need of something to do during your layover. Chase Field, Desert Ridge Marketplace and Heritage Square are located about 4.0 mi, 16.7 mi, and 4.0 mi, respectively from Phoenix Sky Harbor Intl if you are interested in checking them out. Those on a layover in Phoenix in need of a rental car can book one at Phoenix Sky Harbor Intl for about $53.

  • Where are the least popular layover locations for Ontario to Miami flights?

    Ontario to Miami flights that have layovers will least frequently stop in Dallas.

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

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

  • How can I find direct flights from Ontario to Miami?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Miami 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 Miami?

    Currently, September is the cheapest month in which you can book a flight from Ontario to Miami (average of $232). Flying from Ontario to Miami in March is currently the most expensive (average of $289). 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 Miami?

Book flights to Miami if you plan to visit one of these locations
Hollywood
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Plantation
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Wilton Manors
Hallandale Beach

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Top 5 airlines flying from Ontario to Miami

Discover the top 5 airlines that operate flights from Ontario to Miami. 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 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$150Average$262FlexibilityNo cancel feeOn-time62%
DeltaCheapest$296Average$399FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$324Average$454FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$326Average$462FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$372Average$508FlexibilityNo cancel feeOn-time63%

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