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$103+ Cheap flights from Miami to Ontario (MIA - ONT)

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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — ONT
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Miami to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Miami (MIA) to Ontario (ONT). 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 July 29, 2025.

Round-trip from

$258
(Frontier)

One-way from

$103
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$357
From Miami to Ontario
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One-way flight from Miami to Ontario
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Highest demand for flights based on searches. 17% potential increase in price ($80 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Miami to Ontario

Cheapest flights from Miami to Ontario
Explore the most affordable flight options available from Miami to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Frontier deal was found by Cheapflights users on 7/29. 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.
Sat 8/97:15 amMIA - ONT
1 stop12h 05mFrontier
Sat 8/165:21 pmONT - MIA
1 stop10h 09mFrontier
Deal found 7/29$258
This Trip.com deal was found by Cheapflights users on 7/27. 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.
Thu 8/77:00 amMIA - ONT
1 stop12h 19mMultiple Airlines
Thu 8/146:00 amONT - MIA
1 stop10h 23mMultiple Airlines
Deal found 7/27$283
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Wed 8/134:16 pmMIA - ONT
1 stop8h 50mUnited Airlines
Mon 8/185:05 amONT - MIA
1 stop8h 15mUnited Airlines
Deal found 7/28$332
This Alaska Airlines deal was found by Cheapflights users on 7/27. 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.
Fri 9/266:45 pmMIA - ONT
1 stop18h 59mAlaska Airlines
Mon 9/2911:39 amONT - MIA
1 stop27h 06mAlaska Airlines
Deal found 7/27$336
This Delta deal was found by Cheapflights users on 7/28. 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.
Sat 9/136:00 amMIA - ONT
1 stop7h 42mDelta
Sat 9/2011:55 amONT - MIA
1 stop9h 28mDelta
Deal found 7/28$337
This Southwest deal was found by Cheapflights users on 7/27. 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.
Sat 8/236:05 amMIA - ONT
1 stop15h 10mSouthwest
Fri 9/56:20 amONT - MIA
2 stops12h 50mSouthwest
Deal found 7/27$363

Cheapflights Fare Finder

 
Customize your flight search to find flights from Miami to Ontario 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 July 29, 2025.
Use the filters below to find and compare flights from Miami to Ontario that are best for you.

Fly from

Miami

Fly to

Ontario

Route

Depart

Return

Price

MiamiOntario

MIA - ONT

MIAONT

Miami

Sat 8/9

7:15 am-4:20 pm

1 stop12h 05m

Ontario

Sat 8/16

5:21 pm-6:30 am

1 stop10h 09m

$258

MiamiOntario

MIA - ONT

MIAONT

Miami

Thu 8/7

7:00 am-4:19 pm

1 stop12h 19m

Ontario

Thu 8/14

6:00 am-7:23 pm

1 stop10h 23m

$283

MiamiOntario

MIA - ONT

MIAONT

Miami

Fri 8/22

6:20 am-9:58 am

1 stop6h 38m

Ontario

Sun 8/31

10:50 am-8:37 pm

1 stop6h 47m

$306

MiamiOntario

MIA - ONT

MIAONT

Miami

Wed 8/13

4:16 pm-10:06 pm

1 stop8h 50m

Ontario

Mon 8/18

5:05 am-4:20 pm

1 stop8h 15m

$332

MiamiOntario

MIA - ONT

MIAONT

Miami

Fri 9/26

6:45 pm-10:44 am

1 stop18h 59m

Ontario

Mon 9/29

11:39 am-5:45 pm

1 stop27h 06m

$336

MiamiOntario

MIA - ONT

MIAONT

Miami

Sat 9/13

6:00 am-10:42 am

1 stop7h 42m

Ontario

Sun 9/21

10:00 pm-9:20 am

1 stop8h 20m

$337

MiamiOntario

MIA - ONT

MIAONT

Miami

Sat 8/23

6:05 am-6:15 pm

1 stop15h 10m

Ontario

Fri 9/5

6:20 am-10:10 pm

2 stops12h 50m

$363

MiamiOntario

MIA - ONT

MIAONT

Miami

Sat 10/25

6:00 am-11:50 pm

1 stop20h 50m

$103

MiamiOntario

MIA - ONT

MIAONT

Miami

Mon 9/1

8:23 pm-4:18 pm

1 stop22h 55m

$140

MiamiOntario

MIA - ONT

MIAONT

Miami

Sat 8/30

8:10 am-7:11 pm

2 stops14h 01m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 13 results
1
2

Best time to book a flight from Miami to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from Miami to Ontario (average of $246). Flying from Miami to Ontario in March is currently the most expensive (average of $328). 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 MIA to ONT?

Find hourly flight availability from Miami to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

It’s typically best to fly out from Miami to Ontario in the afternoon. Doing so could potentially save you 33% on the flight price compared to flying at noon, which is usually more expensive.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated July 29, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Miami to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Food

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

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Food

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
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Food

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
7,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Food

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
8,893 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Food

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

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

Food

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

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

    Currently priced at $258, Frontier will fly you from Miami to Ontario and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and United Airlines - these airlines can fly you to your destination from $306 and $332, respectively. Users have found that Frontier is 32% cheaper than the other options available to this destination.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $103. However, be on the lookout for offers from Delta and American Airlines, as they are both options that can get you from Miami to Ontario for a low price.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Miami to Ontario (average of $246). Flying from Miami to Ontario in March is currently the most expensive (average of $328). 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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Alternative routes for Miami to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Miami to Ontario

Discover the top 4 airlines that operate flights from Miami to Ontario. 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$170Average$280FlexibilityNo cancel feeOn-time62%
DeltaCheapest$253Average$444FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$256Average$444FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$256Average$372FlexibilityNo cancel feeOn-time71%

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