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

Frontier, Delta, and American Airlines 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 August 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.

$113 Cheap Flights from Ontario to Florida Keys in 2026

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.

9:33 am - 11:55 pm-

11h 22m

8:00 am - 7:01 pm-

14h 01m

$231Frontier

Mon, Aug 24 - Tue, Sep 1

9:33 am - 4:22 pm-

27h 49m

8:10 am - 11:50 pm-

42h 40m

$243Frontier

Fri, Aug 28 - Fri, Sep 4

7:05 am - 7:57 pm-

9h 52m

2:00 pm - 8:05 pm-

9h 05m

$380Delta

Sat, Sep 5 - Fri, Sep 11

7:05 am - 7:57 pm-

9h 52m

2:00 pm - 8:05 pm-

9h 05m

$398Delta

Sat, Sep 5 - Fri, Sep 11

11:45 am - 12:46 am-

10h 01m

7:35 am - 7:03 pm-

14h 28m

$411Multiple Airlines

Mon, Sep 21 - Wed, Sep 23

4:00 pm - 6:31 am-

11h 31m

5:00 pm - 11:59 pm-

9h 59m

$413Alaska Airlines

Tue, Jan 5 - Tue, Jan 12

8:35 am - 9:55 pm-

10h 20m

2:20 pm - 10:05 pm-

10h 45m

$423Southwest

Wed, Sep 9 - Wed, Sep 16

8:35 am - 9:55 pm-

10h 20m

2:20 pm - 10:05 pm-

10h 45m

$423Southwest

Wed, Sep 9 - Tue, Sep 15

9:29 am - 8:00 pm-

7h 31m

4:45 pm - 9:39 pm-

7h 54m

$428American Airlines

Tue, Nov 3 - Thu, Nov 26

12:37 pm - 11:18 pm-

7h 41m

5:25 am - 9:29 am-

7h 04m

$435American Airlines

Fri, Sep 11 - Sun, Sep 13

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Delta flights from Ontario to Florida Keys

Our best Delta deals on Ontario to Florida Keys flight tickets

Delta

Sep 5

ONT7:05 amOntario

9h 52m

1 stop

EYW7:57 pmKey West

Sep 11

EYW2:00 pmKey West

9h 05m

1 stop

ONT8:05 pmOntario

$380

Delta

Sep 5

ONT7:05 amOntario

9h 52m

1 stop

EYW7:57 pmKey West

Sep 11

EYW2:00 pmKey West

9h 05m

1 stop

ONT8:05 pmOntario

$398

Delta

Sep 15

ONT7:05 amOntario

9h 55m

1 stop

EYW8:00 pmKey West

Sep 23

EYW2:00 pmKey West

11h 40m

2 stops

ONT10:40 pmOntario

$434

Frontier flights from Ontario to Florida Keys

Our best Frontier deals on Ontario to Florida Keys flight tickets

Frontier

Aug 24

ONT9:33 amOntario

11h 22m

1 stop

MIA11:55 pmMiami

Sep 1

MIA8:00 amMiami

14h 01m

1 stop

ONT7:01 pmOntario

$231

Frontier

Aug 28

ONT9:33 amOntario

27h 49m

1 stop

MIA4:22 pmMiami

Sep 4

MIA8:10 amMiami

42h 40m

2 stops

ONT11:50 pmOntario

$243

Frontier

Aug 28

ONT9:33 amOntario

27h 49m

1 stop

MIA4:22 pmMiami

Sep 4

MIA8:10 amMiami

42h 40m

2 stops

ONT11:50 pmOntario

$245

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Mon 8/24

9:33 am-11:55 pm

1 stop11h 22m

Miami

Tue 9/1

8:00 am-7:01 pm

1 stop14h 01m

$231

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 8/28

9:33 am-4:22 pm

1 stop27h 49m

Miami

Fri 9/4

8:10 am-11:50 pm

2 stops42h 40m

$243

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 9/5

7:05 am-7:57 pm

1 stop9h 52m

Key West

Fri 9/11

2:00 pm-8:05 pm

1 stop9h 05m

$380

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 9/5

7:05 am-7:57 pm

1 stop9h 52m

Key West

Fri 9/11

2:00 pm-8:05 pm

1 stop9h 05m

$398

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Mon 9/21

11:45 am-12:46 am

1 stop10h 01m

Miami

Wed 9/23

7:35 am-7:03 pm

2 stops14h 28m

$411

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 1/5

4:00 pm-6:31 am

1 stop11h 31m

Miami

Tue 1/12

5:00 pm-11:59 pm

1 stop9h 59m

$413

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Wed 9/9

8:35 am-9:55 pm

2 stops10h 20m

Miami

Wed 9/16

2:20 pm-10:05 pm

2 stops10h 45m

$423

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Wed 9/9

8:35 am-9:55 pm

2 stops10h 20m

Miami

Tue 9/15

2:20 pm-10:05 pm

2 stops10h 45m

$423

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Tue 11/3

9:29 am-8:00 pm

1 stop7h 31m

Miami

Thu 11/26

4:45 pm-9:39 pm

1 stop7h 54m

$428

Quickest round-trip

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Fri 9/11

12:37 pm-11:18 pm

1 stop7h 41m

Miami

Sun 9/13

5:25 am-9:29 am

1 stop7h 04m

$435

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 $355.

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 $416 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 $365 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 25m
Direct flights	None

The fastest flight from Ontario to Florida Keys takes 6h 25m

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 August 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 14.83% of the total bookings. Other popular models include Airbus A320neo with 13.82%, Airbus A321-100/200 with 12.83%, and Boeing 737 MAX 8 with 10.84%.

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.