What are the cheapest airlines flying from Ontario to Key West round-trip?

United Airlines, at $580, was found to be the cheapest airline from Ontario to Key West.Alternate airlines to your destination round-trip include American Airlines and Delta. United Airlines is priced at 2% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Ontario to Key West one-way?

To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $275. United Airlines flights start at $297 while deals on Delta start at $309 one-way.

What is the cheapest day to fly from Ontario to Key West?

Travelers seeking maximum savings on their Ontario to Key West flight should consider departing on Wednesday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from Ontario to Key West?

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 84% on the overall cost on flights from Ontario to Key West.

How far in advance should I book a flight from Ontario to Key West?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 60 days in advance, which can save you up to 77% on flights from Ontario to Key West compared to booking the week you need them. Waiting 60 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $416. For sooner than that we have options available in the next 3 days from $498.

What is the cheapest month to fly from Ontario to Key West?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, January can be a great choice for travel to Key West. Flights to Key West from Ontario in January are about $516 on average during January, but can be found for as low as $308.

What is the cheapest time of day to fly from ONT to EYW?

Unlike in the morning, when flights are generally more expensive, you can save up to 11% on flights from Ontario to Key West by exploring options for tickets at noon.

Most accurate provider : When it comes to deals on Ontario-Key West flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Key West flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Key West flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-Key West flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Key West flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Ontario to Key West that include hotel bookings?

Yes. In addition to deals on Ontario to Key West flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to Key West?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Key West.

Can I find deals for business class flights from Ontario to Key West?

Yes. Cheapflights offers flight deals from Ontario to Key West by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$275+ Flights from Ontario to Key West

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Ontario to Key West with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Key West

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$580 (United Airlines)
One-way from	$275 (American Airlines)
Popular in	October
Cheapest in	September
Average price	$358

Provider with most accurate pricing for Ontario-Key West flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Key West flights.

Search Deals

From Ontario to Key West

Search Deals

One-way flight from Ontario to Key West

Search Deals

Highest demand for flights based on searches. 27% potential increase in price ($221 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 15% potential price decrease ($82 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Find flight deals from Ontario to Key West

Cheapest flights from Ontario to Key West
Explore the most affordable flight options available from Ontario to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marzo 26, 2025.

jue. 5/296:41 pmONT - EYW

2 stops20h 24mUnited Airlines

lun. 6/26:45 pmEYW - ONT

2 stops29h 25mUnited Airlines

Deal found 3/25

$580

dom. 10/1211:09 pmONT - EYW

1 stop9h 08mAmerican Airlines

dom. 10/193:01 pmEYW - ONT

1 stop7h 59mAmerican Airlines

Deal found 3/25

$643

mié. 4/97:00 amONT - EYW

1 stop7h 15mDelta

dom. 4/137:00 amEYW - ONT

1 stop7h 29mDelta

Deal found 3/25

$984

Best flights from Ontario to Key West
Discover carefully curated flight deals from Ontario to Key West that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated marzo 26, 2025.

jue. 5/296:41 pmONT - EYW

2 stops20h 24mUnited Airlines

lun. 6/26:45 pmEYW - ONT

2 stops29h 25mUnited Airlines

Deal found 3/25

$580

mié. 4/96:00 amONT - EYW

1 stop7h 16mAmerican Airlines

dom. 4/131:39 pmEYW - ONT

2 stops11h 31mAmerican Airlines

Deal found 3/25

$924

mié. 4/97:00 amONT - EYW

1 stop7h 15mDelta

dom. 4/137:00 amEYW - ONT

1 stop7h 29mDelta

Deal found 3/25

$984

Last-minute flights from Ontario to Key West
Discover last-minute flight deals from Ontario to Key West. Data last updated marzo 26, 2025 and is based on user searches.

mié. 4/96:00 amONT - EYW

1 stop7h 16mAmerican Airlines

dom. 4/131:39 pmEYW - ONT

2 stops11h 31mAmerican Airlines

Deal found 3/25

$924

mié. 4/97:00 amONT - EYW

1 stop7h 15mDelta

dom. 4/137:00 amEYW - ONT

1 stop7h 29mDelta

Deal found 3/25

$984

dom. 4/276:10 amONT - EYW

2 stops32h 55mUnited Airlines

jue. 5/16:45 pmEYW - ONT

2 stops30h 15mUnited Airlines

Deal found 3/24

$599

One-way flights from Ontario to Key West
Search for one-way flight options from Ontario to Key West. Find affordable one-way fares based on user searches. Data last updated marzo 26, 2025.

dom. 6/1511:59 pmONT - EYW

2 stops13h 12mAmerican Airlines

Deal found 3/26

$275

jue. 4/246:39 pmONT - EYW

2 stops20h 26mUnited Airlines

Deal found 3/25

$297

jue. 4/247:00 amONT - EYW

1 stop7h 17mDelta

Deal found 3/25

$309

jue. 5/154:45 pmONT - EYW

2 stops12h 15mMultiple Airlines

Deal found 3/25

$324

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Key West that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioKey West

ONT - EYW

ONTEYW

Ontario

jue. 5/29

6:41 pm-6:05 pm

2 stops20h 24m

Key West

lun. 6/2

6:45 pm-9:10 pm

2 stops29h 25m

$580

OntarioKey West

ONT - EYW

ONTEYW

Ontario

mié. 4/9

6:00 am-4:16 pm

1 stop7h 16m

Key West

dom. 4/13

1:39 pm-10:10 pm

2 stops11h 31m

$924

OntarioKey West

ONT - EYW

ONTEYW

Ontario

mié. 4/9

7:00 am-5:15 pm

1 stop7h 15m

Key West

dom. 4/13

7:00 am-11:29 am

1 stop7h 29m

$984

OntarioKey West

ONT - EYW

ONTEYW

Ontario

dom. 6/15

11:59 pm-4:11 pm

2 stops13h 12m

$275

OntarioKey West

ONT - EYW

ONTEYW

Ontario

jue. 4/24

6:39 pm-6:05 pm

2 stops20h 26m

$297

OntarioKey West

ONT - EYW

ONTEYW

Ontario

jue. 4/24

7:00 am-5:17 pm

1 stop7h 17m

$309

OntarioKey West

ONT - EYW

ONTEYW

Ontario

jue. 5/15

4:45 pm-8:00 am

2 stops12h 15m

$324

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Compare providers for flights from Ontario to Key West

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Key West in March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Ontario-Key West flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Key West flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Key West flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-Key West flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Key West flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Key West

Have a flexible travel schedule? Discover the best time to fly to Key West from Ontario with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Key West

What is the cheapest month to book a flight from Ontario to Key West?

Currently, August is the cheapest month in which you can book a flight from Ontario to Key West (average of $328). Flying from Ontario to Key West in March is currently the most expensive (average of $495). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in Key West by month

In terms of precipitation, rainfall in Key West ranges from 1.5 - 6.7 inches per month. September is typically the wettest month, when rainfall can reach 6.7 in. February is typically the driest time to visit Key West when rainfall is around 1.5 in.

Temperature in Key West by month

If weather is an important factor for your trip to Key West, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 69.8 F).

Reviews of airlines servicing Key West

Delta

8.0

Very good

7,891 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Delta

8.0

Very good

7,891 reviews

Delta

8.0

Very good

7,891 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

United Airlines

7.4

Good

8,608 reviews

Delta

8.0

Very good

7,891 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,891 reviews

Reviews

1 / 20

10.0

Excellent

Michael,Sep 2023

SMF - ATL

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

Related info for your journey

What are the cheapest airlines flying from Ontario to Key West round-trip?
United Airlines, at $580, was found to be the cheapest airline from Ontario to Key West.Alternate airlines to your destination round-trip include American Airlines and Delta. United Airlines is priced at 2% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Ontario to Key West one-way?
To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $275. United Airlines flights start at $297 while deals on Delta start at $309 one-way.
Can I find deals for flights from Ontario to Key West that include hotel bookings?
Yes. In addition to deals on Ontario to Key West flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to Key West?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Key West.
Can I find deals for business class flights from Ontario to Key West?
Yes. Cheapflights offers flight deals from Ontario to Key West by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ontario to Key West?
Currently, August is the cheapest month in which you can book a flight from Ontario to Key West (average of $328). Flying from Ontario to Key West in March is currently the most expensive (average of $495). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Ontario to Key West

Los Angeles to Miami flights

Los Angeles to Orlando flights

Los Angeles to Fort Lauderdale flights

San Francisco to Miami flights

San Francisco to Orlando flights

Ontario to Miami flights

Burbank to Fort Lauderdale flights

Los Angeles to Tampa flights

Ontario to Orlando flights

San Francisco to Tampa flights

San Francisco to Fort Lauderdale flights

Santa Ana to Fort Lauderdale flights

San Diego to Orlando flights

Burbank to Miami flights

San Diego to Miami flights

Burbank to Orlando flights

Oakland to Fort Lauderdale flights

Santa Ana to Miami flights

Los Angeles to West Palm Beach flights

Las Vegas to Fort Lauderdale flights

Oakland to Miami flights

Sacramento to Orlando flights

Las Vegas to Orlando flights

Santa Ana to Orlando flights

San Diego to Fort Lauderdale flights

Ontario to Fort Lauderdale flights

San Diego to Tampa flights

Las Vegas to Miami flights

San Jose to Miami flights

San Francisco to West Palm Beach flights

Ontario to Tampa flights

Sacramento to Miami flights

Burbank to Tampa flights

Santa Ana to Tampa flights

Los Angeles to Jacksonville flights

Oakland to Orlando flights

Las Vegas to Tampa flights

San Jose to Fort Lauderdale flights

San Jose to Orlando flights

Los Angeles to Pensacola flights

Ontario to Pensacola flights

Palm Springs to Miami flights

Sacramento to Fort Lauderdale flights

Oakland to Tampa flights

Fresno to Orlando flights

Ontario to West Palm Beach flights

Los Angeles to Sarasota flights

San Jose to Tampa flights

San Francisco to Jacksonville flights

Los Angeles to Fort Myers flights

Other flights to Key West

Top 2 airlines flying from Ontario to Key West

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$308	Average$468	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$378	Average$523	FlexibilityNo cancel fee	On-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$275+ Cheap flights from Ontario to Key West (ONT - EYW)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Key West with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Ontario to Key West

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Key West

Cheapest flights from Ontario to Key WestExplore the most affordable flight options available from Ontario to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marzo 26, 2025.

Explore the most affordable flight options available from Ontario to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marzo 26, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Key West that are best for you.

Compare providers for flights from Ontario to Key West

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Key West in March.

Best time to book a flight from Ontario to Key West

Have a flexible travel schedule? Discover the best time to fly to Key West from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Key West

What is the cheapest month to book a flight from Ontario to Key West?

Rainfall in Key West by month

Plan your trip to Key West by taking into account the average rainfall totals by month.

Temperature in Key West by month

Plan your trip to Key West by taking into account the average temperature totals by month.

Reviews of airlines servicing Key West

Related info for your journey

Find useful and relevant information for your journey from Ontario to Key West. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Ontario to Key West round-trip?

What are the cheapest airlines to fly from Ontario to Key West one-way?

Can I find deals for flights from Ontario to Key West that include hotel bookings?

How can I find direct flights from Ontario to Key West?

Can I find deals for business class flights from Ontario to Key West?

What is the cheapest month to book a flight from Ontario to Key West?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Key West

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Ontario to Key West

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Ontario to Key West
Explore the most affordable flight options available from Ontario to Key West. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marzo 26, 2025.