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 May 2026, there are 6 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.

$100 Cheap Flights from Ontario to Florida Keys in 2026

1 adult

0 bags

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.

9:15 am - 9:45 pm

ONT

MIA

9h 30m

1 stop

8:03 pm - 8:04 am

MIA

ONT

15h 01m

1 stop

$232Frontier

Sat, May 16 - Mon, May 25

3:30 pm - 7:00 am

ONT

MIA

12h 30m

1 stop

9:15 am - 7:48 am

MIA

ONT

25h 33m

1 stop

$235Frontier

Fri, May 29 - Fri, Jun 5

8:06 pm - 12:44 am

ONT

MIA

25h 38m

1 stop

6:00 am - 7:35 am

MIA

ONT

28h 35m

1 stop

$236Frontier

Sun, May 10 - Thu, May 14

10:00 pm - 11:00 am

ONT

EYW

10h 00m

1 stop

2:24 pm - 9:50 pm

EYW

ONT

10h 26m

1 stop

$557Delta

Tue, Jul 7 - Fri, Jul 17

11:59 pm - 4:13 pm

ONT

EYW

13h 14m

2 stops

8:20 am - 6:24 pm

EYW

ONT

13h 04m

2 stops

$559American Airlines

Fri, May 15 - Tue, May 19

5:10 pm - 11:00 am

ONT

EYW

14h 50m

2 stops

2:24 pm - 9:50 pm

EYW

ONT

10h 26m

1 stop

$562Delta

Tue, Jul 7 - Fri, Jul 17

10:00 pm - 11:00 am

ONT

EYW

10h 00m

1 stop

2:24 pm - 9:50 pm

EYW

ONT

10h 26m

1 stop

$567Delta

Tue, Jul 7 - Fri, Jul 17

5:34 am - 4:54 pm

ONT

EYW

8h 20m

1 stop

1:41 pm - 10:34 pm

EYW

ONT

11h 53m

2 stops

$588American Airlines

Tue, Jul 7 - Fri, Jul 17

5:34 am - 6:47 pm

ONT

EYW

10h 13m

2 stops

1:41 pm - 10:34 pm

EYW

ONT

11h 53m

2 stops

$593American Airlines

Tue, Jul 7 - Fri, Jul 17

7:30 am - 5:02 pm

ONT

EYW

6h 32m

1 stop

8:05 am - 6:38 pm

EYW

ONT

13h 33m

2 stops

$599American Airlines

Tue, May 12 - Sat, May 16

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Frontier flights from Ontario to Florida Keys

Our best Frontier deals on Ontario to Florida Keys flight tickets

Frontier

Jun 3

ONT8:06 pmOntario

25h 38m

1 stop

MIA12:44 amMiami

Jun 10

MIA7:00 amMiami

12h 48m

1 stop

ONT4:48 pmOntario

$230

Frontier

May 29

ONT8:06 pmOntario

25h 38m

1 stop

MIA12:44 amMiami

Jun 5

MIA9:15 amMiami

25h 33m

1 stop

ONT7:48 amOntario

$231

Frontier

May 16

ONT9:15 amOntario

9h 30m

1 stop

MIA9:45 pmMiami

May 25

MIA8:03 pmMiami

15h 01m

1 stop

ONT8:04 amOntario

$232

United Airlines flights from Ontario to Florida Keys

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

United Airlines

May 9

ONT6:00 amOntario

7h 02m

1 stop

EYW4:02 pmKey West

May 12

EYW4:47 pmKey West

8h 11m

1 stop

ONT9:58 pmOntario

$585

United Airlines

May 2

ONT6:00 amOntario

7h 02m

1 stop

EYW4:02 pmKey West

May 4

EYW4:47 pmKey West

8h 11m

1 stop

ONT9:58 pmOntario

$692

United Airlines

May 3

ONT6:00 amOntario

7h 02m

1 stop

EYW4:02 pmKey West

May 6

EYW4:47 pmKey West

8h 11m

1 stop

ONT9:58 pmOntario

$886

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 5/16

9:15 am-9:45 pm

1 stop9h 30m

Miami

Mon 5/25

8:03 pm-8:04 am

1 stop15h 01m

$232

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 5/29

3:30 pm-7:00 am

1 stop12h 30m

Miami

Fri 6/5

9:15 am-7:48 am

1 stop25h 33m

$235

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sun 5/10

8:06 pm-12:44 am

1 stop25h 38m

Miami

Thu 5/14

6:00 am-7:35 am

1 stop28h 35m

$236

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 7/7

10:00 pm-11:00 am

1 stop10h 00m

Key West

Fri 7/17

2:24 pm-9:50 pm

1 stop10h 26m

$557

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 5/15

11:59 pm-4:13 pm

2 stops13h 14m

Key West

Tue 5/19

8:20 am-6:24 pm

2 stops13h 04m

$559

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 7/7

5:10 pm-11:00 am

2 stops14h 50m

Key West

Fri 7/17

2:24 pm-9:50 pm

1 stop10h 26m

$562

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 7/7

10:00 pm-11:00 am

1 stop10h 00m

Key West

Fri 7/17

2:24 pm-9:50 pm

1 stop10h 26m

$567

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 7/7

5:34 am-4:54 pm

1 stop8h 20m

Key West

Fri 7/17

1:41 pm-10:34 pm

2 stops11h 53m

$588

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 7/7

5:34 am-6:47 pm

2 stops10h 13m

Key West

Fri 7/17

1:41 pm-10:34 pm

2 stops11h 53m

$593

Quickest round-trip

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 5/12

7:30 am-5:02 pm

1 stop6h 32m

Key West

Sat 5/16

8:05 am-6:38 pm

2 stops13h 33m

$599

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 November is another great option to travel to Florida Keys, with average flight prices from Ontario averaging around $136.

How far in advance should I book a flight from Ontario 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 $303 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	7h 02m
Direct flights	None

The fastest flight from Ontario to Florida Keys takes 7h 02m

There are no direct flights from Ontario to Florida Keys. There are no popular flight routes from Ontario to Florida Keys.

Search flight deals

Frequently asked questions about flying 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 May 2026, there are 6 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 13.36% of the total bookings. Other popular models include Boeing 737 MAX 8 with 12.73%, Boeing 737-800 Passenger/BBJ2 (winglets) with 11.01%, and Airbus A320neo with 10.46%.

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.