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Cheap flights from Ontario to Florida Keys from $64

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Florida Keys departing on 11/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Florida Keys

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
12:05 pm - 6:19 amONT-MIA
15h 14m1 stop
Frontier Logo
8:00 am - 6:49 pmMIA-ONT
13h 49m1 stop
$128Frontier
Find Deal
Sat, Nov 1 - Mon, Nov 3
Multiple Airlines Logo
8:00 am - 6:44 pmONT-MIA
31h 44m2 stops
Multiple Airlines Logo
6:00 am - 11:50 pmMIA-ONT
20h 50m1 stop
$161Multiple Airlines
Find Deal
Tue, Nov 11 - Sat, Nov 15
Frontier Logo
1:46 pm - 2:23 pmONT-MIA
21h 37m1 stop
Frontier Logo
5:00 am - 10:10 amMIA-ONT
8h 10m1 stop
$162Frontier
Find Deal
Thu, Oct 30 - Sun, Nov 2
Frontier Logo
12:05 pm - 6:19 amONT-MIA
15h 14m1 stop
Frontier Logo
8:00 am - 6:49 pmMIA-ONT
13h 49m1 stop
$163Frontier
Find Deal
Sat, Nov 8 - Fri, Nov 14
Delta Logo
7:05 am - 8:06 pmONT-EYW
10h 01m1 stop
Delta Logo
12:22 pm - 9:20 pmEYW-ONT
11h 58m2 stops
$374Delta
Find Deal
Tue, Oct 28 - Sat, Nov 1
Delta Logo
6:00 am - 8:06 pmONT-EYW
11h 06m2 stops
Delta Logo
12:22 pm - 9:20 pmEYW-ONT
11h 58m2 stops
$379Delta
Find Deal
Tue, Oct 28 - Sat, Nov 1
American Airlines Logo
6:10 am - 4:18 pmONT-EYW
7h 08m1 stop
American Airlines Logo
1:49 pm - 8:07 pmEYW-ONT
9h 18m1 stop
$439American Airlines
Find Deal
Tue, Oct 28 - Sat, Nov 1
American Airlines Logo
10:34 pm - 1:00 pmONT-EYW
11h 26m2 stops
American Airlines Logo
7:00 am - 1:55 pmEYW-ONT
9h 55m2 stops
$464American Airlines
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Mon, Dec 8 - Mon, Dec 15
United Airlines Logo
6:02 am - 4:08 pmONT-EYW
7h 06m1 stop
United Airlines Logo
4:53 pm - 9:46 pmEYW-ONT
7h 53m1 stop
$544United Airlines
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Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
6:02 am - 4:08 pmONT-EYW
7h 06m1 stop
United Airlines Logo
4:53 pm - 12:17 pmEYW-ONT
22h 24m2 stops
$643United Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9

United Airlines flights from Ontario to Florida Keys

Our best United Airlines deals on Ontario to Florida Keys flight tickets
United Airlines
Oct 22
ONT6:00 amOntario
6h 47m
1 stop
MIA3:47 pmMiami
Oct 28
MIA8:00 amMiami
7h 31m
1 stop
ONT12:31 pmOntario
$462
Find similar
United Airlines
Oct 22
ONT6:00 amOntario
6h 47m
1 stop
MIA3:47 pmMiami
Oct 29
MIA12:51 pmMiami
13h 00m
2 stops
ONT10:51 pmOntario
$467
Find similar
United Airlines
Oct 24
ONT6:00 amOntario
6h 47m
1 stop
MIA3:47 pmMiami
Nov 20
MIA12:51 pmMiami
13h 00m
2 stops
ONT10:51 pmOntario
$478
Find similar

Frontier flights from Ontario to Florida Keys

Our best Frontier deals on Ontario to Florida Keys flight tickets
Frontier
Nov 1
ONT12:05 pmOntario
15h 14m
1 stop
MIA6:19 amMiami
Nov 3
MIA8:00 amMiami
13h 49m
1 stop
ONT6:49 pmOntario
$128
Find similar
Frontier
Oct 30
ONT1:46 pmOntario
21h 37m
1 stop
MIA2:23 pmMiami
Nov 2
MIA5:00 amMiami
8h 10m
1 stop
ONT10:10 amOntario
$162
Find similar
Frontier
Nov 8
ONT12:05 pmOntario
15h 14m
1 stop
MIA6:19 amMiami
Nov 14
MIA8:00 amMiami
13h 49m
1 stop
ONT6:49 pmOntario
$163
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated October 14, 2025.
Use the filters below to find and compare flights from Ontario to Florida Keys that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 11/1

12:05 pm-6:19 am

1 stop15h 14m

Miami

Mon 11/3

8:00 am-6:49 pm

1 stop13h 49m

$128

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 11/11

8:00 am-6:44 pm

2 stops31h 44m

Miami

Sat 11/15

6:00 am-11:50 pm

1 stop20h 50m

$161

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Thu 10/30

1:46 pm-2:23 pm

1 stop21h 37m

Miami

Sun 11/2

5:00 am-10:10 am

1 stop8h 10m

$162

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 11/8

12:05 pm-6:19 am

1 stop15h 14m

Miami

Fri 11/14

8:00 am-6:49 pm

1 stop13h 49m

$163

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 10/28

7:05 am-8:06 pm

1 stop10h 01m

Key West

Sat 11/1

12:22 pm-9:20 pm

2 stops11h 58m

$374

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 10/28

6:00 am-8:06 pm

2 stops11h 06m

Key West

Sat 11/1

12:22 pm-9:20 pm

2 stops11h 58m

$379

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 10/28

6:10 am-4:18 pm

1 stop7h 08m

Key West

Sat 11/1

1:49 pm-8:07 pm

1 stop9h 18m

$439

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Mon 12/8

10:34 pm-1:00 pm

2 stops11h 26m

Key West

Mon 12/15

7:00 am-1:55 pm

2 stops9h 55m

$464

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 3/5

6:02 am-4:08 pm

1 stop7h 06m

Key West

Mon 3/9

4:53 pm-9:46 pm

1 stop7h 53m

$544

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 3/5

6:02 am-4:08 pm

1 stop7h 06m

Key West

Mon 3/9

4:53 pm-12:17 pm

2 stops22h 24m

$643

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Florida Keys from

How to get the cheapest flight ticket from Ontario to Florida Keys

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Florida Keys?

The month of August is another great option to travel to Florida Keys, with average flight prices from Ontario averaging around $356.

What is the cheapest day to depart on your flight to Florida Keys?

The cheapest day to depart from Ontario to Florida Keys is on a Wednesday when prices can be found for as low as $352. The most expensive day to fly to Florida Keys is Friday, with ticket prices averaging around $429.

What is the cheapest time of day to depart on your flight to Florida Keys?

According to our data, the cheapest time of day to fly to Florida Keys is in the afternoon. momondo users have found flights departing from Ontario to Florida Keys in the afternoon for as low as $326. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $396.

How far in advance should I book a flight to Florida Keys?

You are more likely to see cheaper flights to Florida Keys from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Florida Keys for around $430 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Florida Keys from Ontario for as low as $348 on momondo.

Can stopping save me money on Ontario to Florida Keys flights?

No. A direct flight is the cheapest option for a flight between Ontario to Florida Keys.

Cheap Ontario to Florida Keys flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Florida Keys

Direct flights

None
There are no direct flights from Ontario to Florida Keys. There are no popular flight routes from Ontario to Florida Keys.
Search flight deals

  • When did momondo last update prices for flights from Ontario Airport to Florida Keys?

    Prices for flights from Ontario Airport to Florida Keys refresh daily.

  • How many operators does momondo search for flights from Ontario Airport to Florida Keys?

  • How old do you have to be to fly from Ontario Airport to Florida Keys?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Florida Keys.

  • What documentation or ID do you need to fly to Florida Keys?

    The required travel and health documents for your Florida Keys trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Florida Keys. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Ontario to Florida Keys?

Best airlines flying from Ontario to Florida Keys

Compare and see reviews for airlines that fly from Ontario to Florida Keys with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $314Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Florida Keys?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Florida Keys. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Florida Keys with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Florida Keys from Ontario with this policy.

How can momondo help me find flights from Ontario to Florida Keys?

momondo provides multiple filters to help you find the best flight to Florida Keys from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Ontario to Florida Keys right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to Florida Keys flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Florida Keys trip

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Thu 11/13
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