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$80+ 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — ONT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
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 June 30, 2025.

Round-trip from

$153
(FlightHub)

One-way from

$80
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$345
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. 18% potential increase in price ($83 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 June 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 June 30, 2025.

This FlightHub deal was found by Cheapflights users on 6/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/66:00 amMIA - ONT
1 stop20h 50mFrontier
Mon 8/115:21 pmONT - MIA
1 stop10h 09mFrontier
Deal found 6/29$153

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 June 30, 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

Wed 8/6

6:00 am-11:50 pm

1 stop20h 50m

Ontario

Mon 8/11

5:21 pm-6:30 am

1 stop10h 09m

$153

MiamiOntario

MIA - ONT

MIAONT

Miami

Sat 8/23

6:15 am-11:50 pm

1 stop20h 35m

$80

MiamiOntario

MIA - ONT

MIAONT

Miami

Mon 7/14

7:00 am-8:52 pm

1 stop16h 52m

$106

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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 June 30, 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.

What is the cheapest day to fly from Miami to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Miami to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Miami to Ontario flight should consider departing on Tuesday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 June 30, 2025.
Read reviews from past customers who have flown Frontier 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.
Frontier
5.9
Fair
3,289 reviews

Overall

5.9

Food

4.7

Comfort

5.6

Entertainment

4.5

Boarding

6.2

Crew

6.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2025

PDX - LAX

Horrible Experience! The airplane had mechanical issue and was late departing . I had to take a Tram to get to the Baggage Claim ! Then I had to take a bus to the Lyft pick up station !
Frontier
5.9
Fair
3,289 reviews
Frontier
5.9
Fair
3,289 reviews

Overall

5.9

Food

4.7

Comfort

5.6

Entertainment

4.5

Boarding

6.2

Crew

6.8

Reviews

1 / 20
2.0
Mediocre

Anonymous,May 2025

PDX - LAX

Horrible Experience! The airplane had mechanical issue and was late departing . I had to take a Tram to get to the Baggage Claim ! Then I had to take a bus to the Lyft pick up station !

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 is the cheapest airline to fly from Miami to Ontario round-trip?

    Currently priced at $153, Frontier will fly you from Miami to Ontario and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Users have found that Frontier is 59% cheaper than the other options available to this destination.

  • 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.

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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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$162Average$270FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$230Average$366FlexibilityNo cancel feeOn-time71%
DeltaCheapest$253Average$416FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$256Average$444FlexibilityNo cancel feeOn-time69%

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