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Cheap flights from Ontario to Florida Keys from $97

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 11/9. 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

Frontier Logo
1:46 pm - 2:23 pmONT-MIA
21h 37m1 stop
Frontier Logo
8:00 am - 6:49 pmMIA-ONT
13h 49m1 stop
$158Frontier
Find Deal
Thu, Oct 30 - Mon, Nov 3
Frontier Logo
12:28 pm - 2:36 pmONT-MIA
23h 08m1 stop
Frontier Logo
6:00 am - 7:54 pmMIA-ONT
16h 54m1 stop
$161Frontier
Find Deal
Fri, Sep 5 - Mon, Sep 8
Logo
12:28 pm - 11:59 pmONT-MIA
8h 31m1 stop
Logo
6:59 pm - 6:35 pmMIA-ONT
26h 36m1 stop
$197
Find Deal
Thu, Sep 18 - Thu, Sep 25
Logo
7:15 pm - 8:59 amONT-MIA
10h 44m1 stop
Logo
7:54 pm - 11:33 amMIA-ONT
18h 39m1 stop
$221
Find Deal
Sun, Sep 14 - Wed, Sep 24
Delta Logo
7:05 am - 5:15 pmONT-EYW
7h 10m1 stop
Delta Logo
6:10 pm - 10:23 pmEYW-ONT
7h 13m1 stop
$309Delta
Find Deal
Wed, Sep 17 - Wed, Sep 24
Delta Logo
7:05 am - 5:15 pmONT-EYW
7h 10m1 stop
Delta Logo
2:00 pm - 7:15 pmEYW-ONT
8h 15m1 stop
$339Delta
Find Deal
Wed, Sep 17 - Wed, Sep 24
American Airlines Logo
6:10 am - 6:59 pmONT-EYW
9h 49m2 stops
American Airlines Logo
11:25 am - 9:24 pmEYW-ONT
12h 59m2 stops
$384American Airlines
Find Deal
Wed, Sep 17 - Wed, Sep 24
American Airlines Logo
10:35 pm - 12:05 pmONT-EYW
10h 30m1 stop
American Airlines Logo
12:00 pm - 10:33 pmEYW-ONT
13h 33m2 stops
$414American Airlines
Find Deal
Sat, Sep 27 - Wed, Oct 1
United Airlines Logo
1:34 pm - 3:09 pmONT-EYW
22h 35m2 stops
United Airlines Logo
4:10 pm - 10:25 pmEYW-ONT
9h 15m1 stop
$670United Airlines
Find Deal
Mon, Dec 15 - Fri, Dec 19
United Airlines Logo
5:05 am - 3:19 pmONT-EYW
31h 14m2 stops
United Airlines Logo
4:00 pm - 10:31 pmEYW-ONT
9h 31m1 stop
$701United Airlines
Find Deal
Mon, Nov 17 - Fri, Nov 21

Frontier flights from Ontario to Florida Keys

Our best Frontier deals on Ontario to Florida Keys flight tickets
Frontier
Oct 30
ONT1:46 pmOntario
21h 37m
1 stop
MIA2:23 pmMiami
Nov 3
MIA8:00 amMiami
13h 49m
1 stop
ONT6:49 pmOntario
$158
Find similar
Frontier
Sep 5
ONT12:28 pmOntario
23h 08m
1 stop
MIA2:36 pmMiami
Sep 8
MIA6:00 amMiami
16h 54m
1 stop
ONT7:54 pmOntario
$161
Find similar
Frontier
Sep 23
ONT8:59 pmOntario
24h 45m
1 stop
MIA12:44 amMiami
Sep 28
MIA6:00 amMiami
28h 53m
1 stop
ONT7:53 amOntario
$163
Find similar

American Airlines flights from Ontario to Florida Keys

Our best American Airlines deals on Ontario to Florida Keys flight tickets
American Airlines
Aug 31
ONT9:00 amOntario
8h 20m
1 stop
MIA8:20 pmMiami
Sep 4
MIA5:18 amMiami
9h 37m
1 stop
ONT11:55 amOntario
$277
Find similar
American Airlines
Sep 6
ONT2:54 pmOntario
7h 38m
1 stop
MIA1:32 amMiami
Sep 13
MIA5:18 amMiami
9h 38m
2 stops
ONT11:56 amOntario
$307
Find similar
American Airlines
Aug 30
ONT12:47 pmOntario
9h 12m
1 stop
MIA12:59 amMiami
Sep 2
MIA6:20 amMiami
8h 32m
1 stop
ONT11:52 amOntario
$326
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 August 25, 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

Thu 10/30

1:46 pm-2:23 pm

1 stop21h 37m

Miami

Mon 11/3

8:00 am-6:49 pm

1 stop13h 49m

$158

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 9/5

12:28 pm-2:36 pm

1 stop23h 08m

Miami

Mon 9/8

6:00 am-7:54 pm

1 stop16h 54m

$161

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Thu 9/18

12:28 pm-11:59 pm

1 stop8h 31m

Miami

Thu 9/25

6:59 pm-6:35 pm

1 stop26h 36m

$197

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sun 9/14

7:15 pm-8:59 am

1 stop10h 44m

Miami

Wed 9/24

7:54 pm-11:33 am

1 stop18h 39m

$221

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Wed 9/17

7:05 am-5:15 pm

1 stop7h 10m

Key West

Wed 9/24

6:10 pm-10:23 pm

1 stop7h 13m

$309

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Wed 9/17

7:05 am-5:15 pm

1 stop7h 10m

Key West

Wed 9/24

2:00 pm-7:15 pm

1 stop8h 15m

$339

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Wed 9/17

6:10 am-6:59 pm

2 stops9h 49m

Key West

Wed 9/24

11:25 am-9:24 pm

2 stops12h 59m

$384

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 9/27

10:35 pm-12:05 pm

1 stop10h 30m

Key West

Wed 10/1

12:00 pm-10:33 pm

2 stops13h 33m

$414

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Mon 12/15

1:34 pm-3:09 pm

2 stops22h 35m

Key West

Fri 12/19

4:10 pm-10:25 pm

1 stop9h 15m

$670

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Mon 11/17

5:05 am-3:19 pm

2 stops31h 14m

Key West

Fri 11/21

4:00 pm-10:31 pm

1 stop9h 31m

$701

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 $350.

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 $432 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 $362 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 $318Free CancellationRating
7.2
10,000 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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