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Ontario

$86+ 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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — ONT
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
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Cheap 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 March 23, 2026.

This Frontier deal was found by Cheapflights users on 3/21. 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.
Tue 4/148:42 am
MIA
-
ONT
1 stop13h 07m
Frontier
Mon 4/208:59 pm
ONT
-
MIA
1 stop7h 23m
Frontier
Deal found 3/21$160
This Flightnetwork deal was found by Cheapflights users on 3/22. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/165:35 pm
MIA
-
ONT
1 stop26h 03m
Frontier
Sat 4/1811:44 am
ONT
-
MIA
1 stop16h 48m
Frontier
Deal found 3/22$161
This Booking.com deal was found by Cheapflights users on 3/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/165:35 pm
MIA
-
ONT
1 stop26h 03m
Frontier
Sat 4/2512:59 am
ONT
-
MIA
1 stop25h 06m
Frontier
Deal found 3/22$162
This Gotogate deal was found by Cheapflights users on 3/22. 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 4/165:35 pm
MIA
-
ONT
1 stop26h 03m
Frontier
Sat 4/257:44 pm
ONT
-
MIA
1 stop8h 48m
Frontier
Deal found 3/22$167
This CheapOair deal was found by Cheapflights users on 3/22. 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 4/171:15 pm
MIA
-
ONT
1 stop13h 43m
Frontier
Sat 4/1812:59 am
ONT
-
MIA
1 stop25h 06m
Frontier
Deal found 3/22$171
This Mytrip deal was found by Cheapflights users on 3/22. 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.
Wed 4/158:42 am
MIA
-
ONT
1 stop26h 42m
Frontier
Sat 4/1812:59 am
ONT
-
MIA
1 stop25h 06m
Frontier
Deal found 3/22$172
This Frontier deal was found by Cheapflights users on 3/20. 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 4/910:39 am
MIA
-
ONT
1 stop11h 06m
Frontier
Tue 4/147:44 pm
ONT
-
MIA
1 stop8h 38m
Frontier
Deal found 3/20$180
This Frontier deal was found by Cheapflights users on 3/21. 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 4/910:39 am
MIA
-
ONT
1 stop11h 06m
Frontier
Wed 4/1511:44 am
ONT
-
MIA
1 stop16h 48m
Frontier
Deal found 3/21$181
This Frontier deal was found by Cheapflights users on 3/19. 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 5/28:42 am
MIA
-
ONT
1 stop13h 07m
Frontier
Sat 5/94:04 pm
ONT
-
MIA
1 stop11h 56m
Frontier
Deal found 3/19$185
This Booking.com deal was found by Cheapflights users on 3/21. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/28:42 am
MIA
-
ONT
1 stop13h 07m
Frontier
Thu 5/148:06 pm
ONT
-
MIA
1 stop25h 38m
Frontier
Deal found 3/21$187
This CheapOair deal was found by Cheapflights users on 3/20. 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 4/910:39 am
MIA
-
ONT
1 stop11h 06m
Frontier
Sat 4/1812:59 am
ONT
-
MIA
1 stop25h 06m
Frontier
Deal found 3/20$191

Find 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 March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(Frontier)

One-way from

$86
(Frontier)

Popular in

November

Cheapest in

August

Average price

$486
Provider with most accurate pricing for Miami-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Ontario flights.
Search Deals
From Miami to Ontario
Search Deals
One-way flight from Miami to Ontario
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 23, 2026.
Use the filters below to find and compare flights from Miami to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MiamiOntario

MIA - ONT

MIAONT

Miami

Fri 4/17

1:15 pm-11:58 pm

1 stop13h 43m

Ontario

Sat 4/18

12:59 am-5:05 am

1 stop25h 06m

$171

MiamiOntario

MIA - ONT

MIAONT

Miami

Thu 4/16

5:35 pm-4:38 pm

1 stop26h 03m

Ontario

Wed 4/22

7:44 pm-7:32 am

1 stop8h 48m

$191

MiamiOntario

MIA - ONT

MIAONT

Miami

Thu 4/2

10:39 am-6:45 pm

1 stop11h 06m

Ontario

Wed 4/8

5:18 pm-9:44 am

1 stop13h 26m

$283

MiamiOntario

MIA - ONT

MIAONT

Miami

Thu 5/21

7:00 am-12:19 pm

1 stop8h 19m

Ontario

Mon 5/25

10:00 pm-9:29 am

1 stop8h 29m

$377

MiamiOntario

MIA - ONT

MIAONT

Miami

Fri 5/8

7:00 am-12:19 pm

1 stop8h 19m

Ontario

Sun 5/17

10:00 pm-9:29 am

1 stop8h 29m

$408

MiamiOntario

MIA - ONT

MIAONT

Miami

Wed 4/8

7:05 am-11:47 am

1 stop7h 42m

Ontario

Mon 4/13

10:15 pm-9:20 am

1 stop8h 05m

$413

MiamiOntario

MIA - ONT

MIAONT

Miami

Wed 4/15

4:53 pm-9:50 pm

1 stop7h 57m

Ontario

Sat 4/18

5:10 am-10:28 pm

2 stops14h 18m

$418

MiamiOntario

MIA - ONT

MIAONT

Miami

Tue 3/31

12:55 pm-8:20 pm

1 stop10h 25m

Ontario

Thu 4/2

11:55 pm-1:50 pm

2 stops10h 55m

$453
Quickest round-trip

MiamiOntario

MIA - ONT

MIAONT

Miami

Thu 4/2

7:05 am-11:47 am

1 stop7h 42m

Ontario

Thu 4/9

10:25 pm-9:20 am

1 stop7h 55m

$465
Cheapest one-way
Quickest one-way

MiamiOntario

MIA - ONT

MIAONT

Miami

Tue 6/30

7:00 am-12:10 pm

1 stop8h 10m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/21

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

Compare providers for flights from Miami to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Miami to Ontario in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Miami-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Miami-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Miami-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Miami-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Miami-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, October is the cheapest month in which you can book a flight from Miami to Ontario (average of $118). Flying from Miami to Ontario in July is currently the most expensive (average of $168). 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 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 March 23, 2026.
Read reviews from past customers who have flown Southwest and American Airlines 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.
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,488 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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.

  • How long is the flight from Miami to Ontario?

    Frontier and Delta can get you from Miami to Ontario in just under 8h 19m. Your travel time can differ by up to 5h 24m. Airlines will cover a distance of 2291 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $298, American Airlines will fly you from Miami to Ontario and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Southwest and United Airlines - these airlines can fly you to your destination from $326 and $336, respectively. Users have found that American Airlines is 25% 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 JetBlue, with whom users have recently found tickets for as low as $84. However, be on the lookout for offers from Frontier 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, October is the cheapest month in which you can book a flight from Miami to Ontario (average of $118). Flying from Miami to Ontario in July is currently the most expensive (average of $168). 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 March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$298Average$375FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$326Average$508FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$336Average$416FlexibilityNo cancel feeOn-time69%
DeltaCheapest$365Average$444FlexibilityNo cancel feeOn-timeN/A

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