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Cheap flights from Ontario to Florida Keys from $53

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 3/3. 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
7:00 am - 5:19 amONT-MIA
19h 19m1 stop
Frontier Logo
7:00 am - 12:42 pmMIA-ONT
32h 42m2 stops
$142Frontier
Find Deal
Wed, Feb 25 - Mon, Mar 2
Frontier Logo
6:00 am - 11:57 amONT-MIA
26h 57m1 stop
Frontier Logo
7:45 am - 2:23 pmMIA-ONT
9h 38m1 stop
$148Frontier
Find Deal
Sun, Jan 11 - Sun, Jan 18
Frontier Logo
1:46 pm - 7:33 pmONT-MIA
26h 47m1 stop
Frontier Logo
1:41 pm - 12:43 pmMIA-ONT
26h 02m1 stop
$149Frontier
Find Deal
Fri, Jan 23 - Sun, Jan 25
Frontier Logo
7:15 am - 5:12 pmONT-MIA
30h 57m1 stop
Frontier Logo
7:09 pm - 11:24 pmMIA-ONT
31h 15m2 stops
$151Frontier
Find Deal
Tue, Jan 20 - Fri, Jan 30
Delta Logo
7:05 am - 8:06 pmONT-EYW
10h 01m1 stop
Delta Logo
6:20 pm - 11:23 pmEYW-ONT
8h 03m1 stop
$389Delta
Find Deal
Thu, Dec 18 - Mon, Dec 22
American Airlines Logo
6:00 am - 4:23 pmONT-EYW
7h 23m1 stop
American Airlines Logo
5:15 pm - 10:48 pmEYW-ONT
8h 33m1 stop
$409American Airlines
Find Deal
Sat, Jan 10 - Wed, Jan 14
American Airlines Logo
6:00 am - 4:23 pmONT-EYW
7h 23m1 stop
American Airlines Logo
6:06 am - 2:18 pmEYW-ONT
11h 12m2 stops
$414American Airlines
Find Deal
Sat, Jan 10 - Wed, Jan 14
United Airlines Logo
6:00 am - 3:53 pmONT-EYW
6h 53m1 stop
United Airlines Logo
4:34 pm - 9:59 pmEYW-ONT
8h 25m1 stop
$434United Airlines
Find Deal
Sat, Feb 21 - Sat, Feb 28
Delta Logo
7:05 am - 8:06 pmONT-EYW
10h 01m1 stop
Delta Logo
6:10 pm - 11:04 pmEYW-ONT
7h 54m1 stop
$439Delta
Find Deal
Sat, Dec 13 - Thu, Dec 18
United Airlines Logo
6:00 am - 3:50 pmONT-EYW
6h 50m1 stop
United Airlines Logo
4:45 pm - 10:11 pmEYW-ONT
8h 26m1 stop
$469United Airlines
Find Deal
Sat, Apr 11 - Sat, Apr 18

American Airlines flights from Ontario to Florida Keys

Our best American Airlines deals on Ontario to Florida Keys flight tickets
American Airlines
Jan 13
ONT6:00 amOntario
7h 57m
1 stop
MIA4:57 pmMiami
Jan 21
MIA7:30 amMiami
9h 48m
1 stop
ONT2:18 pmOntario
$185
Find similar
American Airlines
Jan 20
ONT9:59 amOntario
7h 50m
1 stop
MIA8:49 pmMiami
Jan 27
MIA9:15 amMiami
9h 50m
2 stops
ONT4:05 pmOntario
$190
Find similar
American Airlines
Jan 14
ONT7:16 amOntario
8h 09m
1 stop
MIA6:25 pmMiami
Jan 19
MIA9:30 pmMiami
14h 38m
1 stop
ONT9:08 amOntario
$206
Find similar

Frontier flights from Ontario to Florida Keys

Our best Frontier deals on Ontario to Florida Keys flight tickets
Frontier
Feb 25
ONT7:00 amOntario
19h 19m
1 stop
MIA5:19 amMiami
Mar 2
MIA7:00 amMiami
32h 42m
2 stops
ONT12:42 pmOntario
$142
Find similar
Frontier
Jan 11
ONT6:00 amOntario
26h 57m
1 stop
MIA11:57 amMiami
Jan 18
MIA7:45 amMiami
9h 38m
1 stop
ONT2:23 pmOntario
$148
Find similar
Frontier
Jan 23
ONT1:46 pmOntario
26h 47m
1 stop
MIA7:33 pmMiami
Jan 25
MIA1:41 pmMiami
26h 02m
1 stop
ONT12:43 pmOntario
$149
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 December 3, 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

Wed 2/25

7:00 am-5:19 am

1 stop19h 19m

Miami

Mon 3/2

7:00 am-12:42 pm

2 stops32h 42m

$142

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sun 1/11

6:00 am-11:57 am

1 stop26h 57m

Miami

Sun 1/18

7:45 am-2:23 pm

1 stop9h 38m

$148

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 1/23

1:46 pm-7:33 pm

1 stop26h 47m

Miami

Sun 1/25

1:41 pm-12:43 pm

1 stop26h 02m

$149

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 1/20

7:15 am-5:12 pm

1 stop30h 57m

Miami

Fri 1/30

7:09 pm-11:24 pm

2 stops31h 15m

$151

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 12/18

7:05 am-8:06 pm

1 stop10h 01m

Key West

Mon 12/22

6:20 pm-11:23 pm

1 stop8h 03m

$389

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 1/10

6:00 am-4:23 pm

1 stop7h 23m

Key West

Wed 1/14

5:15 pm-10:48 pm

1 stop8h 33m

$409

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 1/10

6:00 am-4:23 pm

1 stop7h 23m

Key West

Wed 1/14

6:06 am-2:18 pm

2 stops11h 12m

$414

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 2/21

6:00 am-3:53 pm

1 stop6h 53m

Key West

Sat 2/28

4:34 pm-9:59 pm

1 stop8h 25m

$434

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 12/13

7:05 am-8:06 pm

1 stop10h 01m

Key West

Thu 12/18

6:10 pm-11:04 pm

1 stop7h 54m

$439

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 4/11

6:00 am-3:50 pm

1 stop6h 50m

Key West

Sat 4/18

4:45 pm-10:11 pm

1 stop8h 26m

$469

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 $424 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 $334 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

Fastest flight time

6h 30m

Direct flights

None
The fastest flight from Ontario to Florida Keys takes 6h 30m
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
11,045 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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Find better results for your trip to Florida Keys

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