What is the cheapest airline that flies from Ontario to Florida Keys?

Delta, United Airlines, and Southwest are the most popular carriers operating from Ontario to Florida Keys

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?

As of March 2026, there are 5 operators available to choose from 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.

$103 Cheap Flights from Ontario to Florida Keys in 2026

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Find the cheapest flights from Ontario to Florida Keys

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:44 pm - 7:22 am

ONT

MIA

8h 38m

1 stop

8:42 am - 6:49 pm

MIA

ONT

13h 07m

1 stop

$210Frontier

Tue, Apr 14 - Tue, Apr 21

8:00 am - 9:40 pm

ONT

MIA

10h 40m

1 stop

8:42 am - 6:49 pm

MIA

ONT

13h 07m

1 stop

$215Frontier

Sat, Apr 25 - Wed, Apr 29

8:30 am - 9:45 pm

ONT

MIA

10h 15m

1 stop

9:41 pm - 7:32 pm

MIA

ONT

24h 51m

1 stop

$217Frontier

Wed, May 6 - Mon, May 11

7:44 pm - 7:22 am

ONT

MIA

8h 38m

1 stop

1:55 pm - 10:37 pm

MIA

ONT

11h 42m

1 stop

$219Frontier

Tue, Apr 21 - Sat, Apr 25

5:33 pm - 5:05 am

ONT

MIA

8h 32m

1 stop

6:30 am - 5:04 pm

MIA

ONT

13h 34m

1 stop

$220Frontier

Fri, May 1 - Sat, May 9

10:15 pm - 10:46 am

ONT

EYW

9h 31m

1 stop

1:24 pm - 9:00 pm

EYW

ONT

10h 36m

1 stop

$414Delta

Sat, Apr 25 - Wed, Apr 29

10:26 pm - 11:16 am

ONT

EYW

9h 50m

1 stop

2:01 pm - 9:07 pm

EYW

ONT

10h 06m

1 stop

$469American Airlines

Sat, Apr 25 - Fri, May 1

10:26 pm - 11:16 am

ONT

EYW

9h 50m

1 stop

2:01 pm - 9:07 pm

EYW

ONT

10h 06m

1 stop

$478American Airlines

Thu, May 7 - Thu, May 14

6:00 am - 4:02 pm

ONT

EYW

7h 02m

1 stop

4:47 pm - 9:58 pm

EYW

ONT

8h 11m

1 stop

$499United Airlines

Sat, May 2 - Thu, May 7

10:15 pm - 10:46 am

ONT

EYW

9h 31m

1 stop

2:40 pm - 9:00 pm

EYW

ONT

9h 20m

1 stop

$503Delta

Fri, Apr 24 - Wed, Apr 29

Frontier flights from Ontario to Florida Keys

Our best Frontier deals on Ontario to Florida Keys flight tickets

Frontier

Apr 14

ONT7:44 pmOntario

8h 38m

1 stop

MIA7:22 amMiami

Apr 21

MIA8:42 amMiami

13h 07m

1 stop

ONT6:49 pmOntario

$210

Frontier

Apr 16

ONT6:15 amOntario

11h 44m

1 stop

MIA8:59 pmMiami

Apr 21

MIA8:42 amMiami

13h 07m

1 stop

ONT6:49 pmOntario

$215

Frontier

May 6

ONT8:30 amOntario

10h 15m

1 stop

MIA9:45 pmMiami

May 11

MIA9:41 pmMiami

21h 03m

1 stop

ONT3:44 pmOntario

$217

American Airlines flights from Ontario to Florida Keys

Our best American Airlines deals on Ontario to Florida Keys flight tickets

American Airlines

Mar 30

ONT11:59 pmOntario

10h 02m

1 stop

MIA1:01 pmMiami

Apr 2

MIA6:51 pmMiami

8h 08m

1 stop

ONT11:59 pmOntario

$412

American Airlines

Mar 24

ONT3:19 pmOntario

6h 40m

1 stop

MIA12:59 amMiami

Mar 31

MIA8:50 amMiami

10h 32m

1 stop

ONT4:22 pmOntario

$414

American Airlines

Mar 25

ONT6:00 amOntario

7h 34m

1 stop

MIA4:34 pmMiami

Apr 1

MIA3:28 pmMiami

8h 56m

1 stop

ONT9:24 pmOntario

$428

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 4/14

7:44 pm-7:22 am

1 stop8h 38m

Miami

Tue 4/21

8:42 am-6:49 pm

1 stop13h 07m

$210

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 4/25

8:00 am-9:40 pm

1 stop10h 40m

Miami

Wed 4/29

8:42 am-6:49 pm

1 stop13h 07m

$215

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Wed 5/6

8:30 am-9:45 pm

1 stop10h 15m

Miami

Mon 5/11

9:41 pm-7:32 pm

1 stop24h 51m

$217

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 4/21

7:44 pm-7:22 am

1 stop8h 38m

Miami

Sat 4/25

1:55 pm-10:37 pm

1 stop11h 42m

$219

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 5/1

5:33 pm-5:05 am

1 stop8h 32m

Miami

Sat 5/9

6:30 am-5:04 pm

1 stop13h 34m

$220

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 4/25

10:15 pm-10:46 am

1 stop9h 31m

Key West

Wed 4/29

1:24 pm-9:00 pm

1 stop10h 36m

$414

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 4/25

10:26 pm-11:16 am

1 stop9h 50m

Key West

Fri 5/1

2:01 pm-9:07 pm

1 stop10h 06m

$469

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

10:26 pm-11:16 am

1 stop9h 50m

Key West

Thu 5/14

2:01 pm-9:07 pm

1 stop10h 06m

$478

Quickest round-trip

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 5/2

6:00 am-4:02 pm

1 stop7h 02m

Key West

Thu 5/7

4:47 pm-9:58 pm

1 stop8h 11m

$499

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 4/24

10:15 pm-10:46 am

1 stop9h 31m

Key West

Wed 4/29

2:40 pm-9:00 pm

1 stop9h 20m

$503

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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.

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 $401 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 $320 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 52m
Direct flights	None

The fastest flight from Ontario to Florida Keys takes 6h 52m

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?
As of March 2026, there are 5 operators available to choose from 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?
Based on momondo bookings for flights between Ontario and Florida Keys, the leading plane model is Airbus A321neo, making up 14.29% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 11.19%, Boeing 737 MAX 8 with 10.96%, and Airbus A320neo with 10.66%.

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.