$135 Cheap Flights from Ontario (ONT) to Key West (EYW)

View $135 flight on Wed, Dec 31, 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW)

Cheap Flights from Ontario to Key West (ONT-EYW)

Prices were available within the past 7 days and start at $135 for one-way flights and $303 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Fri, Sep 5 - Tue, Sep 16
ONT
Ontario
EYW
Key West
$303 Roundtrip, found 5 days ago
$303
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Sep 5 from Ontario to Key West, returning Tue, Sep 16, priced at $303 found 5 days ago
American Airlines
Thu, Sep 4 - Tue, Sep 9
ONT
Ontario
EYW
Key West
$309 Roundtrip, found 4 days ago
$309
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Sep 4 from Ontario to Key West, returning Tue, Sep 9, priced at $309 found 4 days ago
Delta
Sun, Oct 12 - Tue, Oct 21
ONT
Ontario
EYW
Key West
$314 Roundtrip, found 6 days ago
$314
Roundtrip
found 6 days ago
Select Delta flight, departing Sun, Oct 12 from Ontario to Key West, returning Tue, Oct 21, priced at $314 found 6 days ago
Delta
Thu, Nov 27 - Wed, Dec 10
ONT
Ontario
EYW
Key West
$323 Roundtrip, found 22 hours ago
$323
Roundtrip
found 22 hours ago
Select Delta flight, departing Thu, Nov 27 from Ontario to Key West, returning Wed, Dec 10, priced at $323 found 22 hours ago
Delta
Tue, Nov 4 - Tue, Nov 18
ONT
Ontario
EYW
Key West
$329 Roundtrip, found 22 hours ago
$329
Roundtrip
found 22 hours ago
Select Delta flight, departing Tue, Nov 4 from Ontario to Key West, returning Tue, Nov 18, priced at $329 found 22 hours ago
Delta
Fri, Oct 31 - Thu, Nov 13
ONT
Ontario
EYW
Key West
$333 Roundtrip, found 3 days ago
$333
Roundtrip
found 3 days ago
Select Delta flight, departing Fri, Oct 31 from Ontario to Key West, returning Thu, Nov 13, priced at $333 found 3 days ago
Delta
Mon, Nov 10 - Tue, Nov 25
ONT
Ontario
EYW
Key West
$334 Roundtrip, found 22 hours ago
$334
Roundtrip
found 22 hours ago
Select Delta flight, departing Mon, Nov 10 from Ontario to Key West, returning Tue, Nov 25, priced at $334 found 22 hours ago
Delta
Sun, Sep 14 - Tue, Sep 23
ONT
Ontario
EYW
Key West
$339 Roundtrip, found 1 day ago
$339
Roundtrip
found 1 day ago
Select Delta flight, departing Sun, Sep 14 from Ontario to Key West, returning Tue, Sep 23, priced at $339 found 1 day ago
United
Wed, Dec 31 - Thu, Jan 8
ONT
Ontario
EYW
Key West
$389 Roundtrip, found 12 hours ago
$389
Roundtrip
found 12 hours ago
Select United flight, departing Wed, Dec 31 from Ontario to Key West, returning Thu, Jan 8, priced at $389 found 12 hours ago
Alaska Airlines
Fri, May 8 - Wed, May 13
ONT
Ontario
EYW
Key West
$1,067 Roundtrip, found 1 day ago
$1,067
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Fri, May 8 from Ontario to Key West, returning Wed, May 13, priced at $1,067 found 1 day ago

Find the cheapest month to fly from Ontario (ONT) to Key West (EYW)

February is typically the cheapest month to fly

From $308 - $698 per traveler.

Graph displaying average flight prices per month

Alternative airports near Key West

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Key West Intl. EYW. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $339
EYW
Key West Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $339
Flights from Ontario (ONT) to Key West (EYW)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Key West Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Roundtrip price
$302
Distance
2243 mi

Ontario to Key West Flights

The cheapest times to fly from Ontario to Key West

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Key West are during the month of September. You can find some of the cheapest flights from Ontario to Key West with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Key West

Sunday is one of the best days to book for cheap flights from Ontario to Key West: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario to Key West

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Key West in 2025. You can also book with separate airlines for your outbound and return journeys, from $135 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Key West flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Key West airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW) cost?
Get a cheap one-way flight from $135 or cheap return flight from $303 from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW)?
The cheapest month to fly from ONT to EYW is September, when demand is low. Off-peak season is usually when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW)?
To find the cheapest airline flying from ONT to EYW, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW)?
You'll need to take a flight with a layover if you're traveling from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from ONT to EYW?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW)?
Select a flight from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW) last-minute?
Booking your flight from ONT to EYW right before your trip is typically more expensive. However, if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book an ONT to EYW flight and hotel package?
Opting for an ONT to EYW flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our extensive range of accommodations and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Key West Intl. Airport (EYW)?
Usually, it's possible to reschedule or cancel your ONT to EYW flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.