HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key West

$309+ Cheap flights from Ontario to Key West (ONT - EYW)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EYW
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Key West (EYW). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$347
(Trip.com)

Popular in

November

Cheapest in

August

Average price

$692
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
Highest demand for flights based on searches. 13% potential increase in price ($89 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 30, 2025.

This Trip.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:00 amONT - EYW
2 stops33h 46mMultiple Airlines
Sun 11/169:36 pmEYW - ONT
2 stops16h 34mMultiple Airlines
Deal found 10/29$347
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/131:34 pmONT - EYW
2 stops22h 50mUnited Airlines
Fri 12/194:10 pmEYW - ONT
1 stop9h 15mUnited Airlines
Deal found 10/30$559
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/307:05 amONT - EYW
1 stop10h 01mDelta
Sun 11/212:22 pmEYW - ONT
1 stop9h 57mDelta
Deal found 10/29$569
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/77:05 amONT - EYW
1 stop7h 10mDelta
Thu 1/17:25 amEYW - ONT
1 stop15h 25mDelta
Deal found 10/30$597
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:05 amONT - EYW
1 stop10h 01mDelta
Thu 1/17:25 amEYW - ONT
1 stop15h 25mDelta
Deal found 10/30$667
This American Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:00 amONT - EYW
1 stop7h 07mAmerican Airlines
Thu 1/13:49 pmEYW - ONT
1 stop9h 25mAmerican Airlines
Deal found 10/30$719
This American Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:00 amONT - EYW
2 stops12h 50mAmerican Airlines
Thu 1/13:49 pmEYW - ONT
1 stop9h 25mAmerican Airlines
Deal found 10/30$725
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/81:34 pmONT - EYW
2 stops22h 50mUnited Airlines
Thu 1/14:08 pmEYW - ONT
1 stop9h 17mUnited Airlines
Deal found 10/30$730
This American Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:00 amONT - EYW
2 stops9h 35mAmerican Airlines
Thu 1/13:49 pmEYW - ONT
1 stop9h 25mAmerican Airlines
Deal found 10/30$864

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Key West that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 30, 2025.
Use the filters below to find and compare flights from Ontario to Key West that are best for you.

Fly from

Ontario

Fly to

Key West

Route

Depart

Return

Price

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 2/5

10:30 pm-11:31 am

1 stop10h 01m

Key West

Mon 2/9

2:45 pm-9:07 pm

1 stop9h 22m

$309

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Wed 11/12

8:00 am-8:46 pm

2 stops33h 46m

Key West

Sun 11/16

9:36 pm-11:10 am

2 stops16h 34m

$347

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 1/9

10:30 pm-11:31 am

1 stop10h 01m

Key West

Tue 1/13

7:10 am-11:54 am

1 stop7h 44m

$468

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 12/13

1:34 pm-3:24 pm

2 stops22h 50m

Key West

Fri 12/19

4:10 pm-10:25 pm

1 stop9h 15m

$559

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Wed 12/10

7:05 am-8:06 pm

1 stop10h 01m

Key West

Thu 1/1

7:25 am-7:50 pm

1 stop15h 25m

$597

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sun 12/7

7:05 am-5:15 pm

1 stop7h 10m

Key West

Thu 1/1

7:25 am-7:50 pm

1 stop15h 25m

$597

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 1/23

6:39 pm-1:03 pm

2 stops15h 24m

Key West

Mon 1/26

4:15 pm-12:47 pm

2 stops23h 32m

$658

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 12/6

7:05 am-8:06 pm

1 stop10h 01m

Key West

Thu 1/1

7:25 am-7:50 pm

1 stop15h 25m

$667

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 12/9

7:05 am-8:06 pm

1 stop10h 01m

Key West

Thu 1/1

7:25 am-7:50 pm

1 stop15h 25m

$667

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 1/9

1:53 pm-11:26 am

2 stops18h 33m

Key West

Tue 1/13

6:05 pm-8:58 pm

2 stops29h 53m

$676

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 13 results
1
2

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Key West flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, September is the cheapest month in which you can book a flight from Ontario to Key West (average of $250). Flying from Ontario to Key West in June is currently the most expensive (average of $436). 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.

Reviews of airlines servicing Key West

Get insights into the airlines that provide service to Key West. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Key West. Reviews last updated October 30, 2025.
Read through reviews of airlines operating flights from Ontario to Key West, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,034 reviews

Comfort

7.2

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break
American Airlines
7.2
Good
11,034 reviews
American Airlines
7.2
Good
11,034 reviews

Comfort

7.2

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break

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.

  • How long is the flight from Ontario to Key West?

    For as low as $309, Delta can have you in Key West from Ontario in 10h 01m. Airlines will cover a distance of 2242 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    American Airlines, at $314, was found to be the cheapest airline from Ontario to Key West.. American Airlines is priced at 47% lower than the current average price of a flight leaving 3 months from now.

  • 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, September is the cheapest month in which you can book a flight from Ontario to Key West (average of $250). Flying from Ontario to Key West in June is currently the most expensive (average of $436). 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

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.
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
Los Angeles to Tampa flights
San Francisco to Fort Lauderdale flights
Las Vegas to Orlando flights
Ontario to Orlando flights
Santa Ana to Fort Lauderdale flights
San Francisco to Tampa flights
San Diego to Orlando flights
Los Angeles to West Palm Beach flights
Burbank to Fort Lauderdale flights
San Diego to Miami flights
Ontario to Fort Lauderdale flights
Santa Ana to Orlando flights
Las Vegas to Fort Lauderdale flights
Las Vegas to Miami flights
San Jose to Miami flights
Santa Ana to Miami flights
San Diego to Tampa flights
Sacramento to Orlando flights
Las Vegas to Tampa flights
San Jose to Orlando flights
Ontario to Tampa flights
San Diego to Fort Lauderdale flights
Burbank to Orlando flights
Sacramento to Miami flights
Los Angeles to Fort Myers flights
San Jose to Fort Lauderdale flights
San Francisco to West Palm Beach flights
Santa Ana to Tampa flights
Burbank to Miami flights
Oakland to Miami flights
Burbank to Tampa flights
Oakland to Orlando flights
Ontario to West Palm Beach flights
San Francisco to Jacksonville flights
San Francisco to Fort Myers flights
San Jose to West Palm Beach flights
Los Angeles to Jacksonville flights
Sacramento to Fort Lauderdale flights
Los Angeles to Pensacola flights
San Diego to Fort Myers flights
Los Angeles to Sarasota flights
Oakland to Fort Lauderdale flights
Fresno to Orlando flights
San Diego to Jacksonville flights

Top airline flying from Ontario to Key West

Discover the top airline that operate flights from Ontario to Key West. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$314Average$683FlexibilityNo cancel feeOn-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.