Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Ontario to Key West from $275

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Key West departing on 6/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to Key West

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
10:26 pm - 11:16 am
ONT
-
EYW
9h 50m
1 stop
American Airlines Logo
11:24 am - 9:07 pm
EYW
-
ONT
12h 43m
2 stops
$409American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
11:59 pm - 3:40 pm
ONT
-
EYW
12h 41m
2 stops
American Airlines Logo
11:24 am - 9:07 pm
EYW
-
ONT
12h 43m
2 stops
$414American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
10:26 pm - 11:16 am
ONT
-
EYW
9h 50m
1 stop
American Airlines Logo
2:01 pm - 9:07 pm
EYW
-
ONT
10h 06m
1 stop
$434American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
11:59 pm - 3:40 pm
ONT
-
EYW
12h 41m
2 stops
American Airlines Logo
2:01 pm - 9:07 pm
EYW
-
ONT
10h 06m
1 stop
$439American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
10:26 pm - 11:16 am
ONT
-
EYW
9h 50m
1 stop
American Airlines Logo
11:24 am - 9:07 pm
EYW
-
ONT
12h 43m
2 stops
$473American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
11:59 pm - 4:30 pm
ONT
-
EYW
13h 31m
2 stops
American Airlines Logo
11:24 am - 9:07 pm
EYW
-
ONT
12h 43m
2 stops
$478American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
10:26 pm - 11:16 am
ONT
-
EYW
9h 50m
1 stop
American Airlines Logo
2:01 pm - 9:07 pm
EYW
-
ONT
10h 06m
1 stop
$498American Airlines
Thu, May 7 - Thu, May 14
United Airlines Logo
6:05 am - 3:57 pm
ONT
-
EYW
6h 52m
1 stop
United Airlines Logo
4:38 pm - 9:50 pm
EYW
-
ONT
8h 12m
1 stop
$499United Airlines
Tue, Apr 7 - Tue, Apr 14
American Airlines Logo
7:30 am - 10:58 pm
ONT
-
EYW
12h 28m
2 stops
American Airlines Logo
2:01 pm - 9:07 pm
EYW
-
ONT
10h 06m
1 stop
$503American Airlines
Thu, May 7 - Thu, May 14
American Airlines Logo
11:59 pm - 3:40 pm
ONT
-
EYW
12h 41m
2 stops
American Airlines Logo
11:24 am - 10:36 pm
EYW
-
ONT
14h 12m
2 stops
$508American Airlines
Thu, May 7 - Thu, May 14

United Airlines flights from Ontario to Key West

Our best United Airlines deals on Ontario to Key West flight tickets
United Airlines
Apr 7
ONT6:05 amOntario
6h 52m
1 stop
EYW3:57 pmKey West
Apr 14
EYW4:38 pmKey West
8h 12m
1 stop
ONT9:50 pmOntario
$499
United Airlines
Apr 28
ONT6:05 amOntario
6h 52m
1 stop
EYW3:57 pmKey West
May 2
EYW4:47 pmKey West
8h 11m
1 stop
ONT9:58 pmOntario
$509
United Airlines
Apr 17
ONT6:05 amOntario
6h 52m
1 stop
EYW3:57 pmKey West
Apr 23
EYW4:38 pmKey West
8h 12m
1 stop
ONT9:50 pmOntario
$539

American Airlines flights from Ontario to Key West

Our best American Airlines deals on Ontario to Key West flight tickets
American Airlines
May 7
ONT10:26 pmOntario
9h 50m
1 stop
EYW11:16 amKey West
May 14
EYW11:24 amKey West
12h 43m
2 stops
ONT9:07 pmOntario
$409
American Airlines
May 7
ONT11:59 pmOntario
12h 41m
2 stops
EYW3:40 pmKey West
May 14
EYW11:24 amKey West
12h 43m
2 stops
ONT9:07 pmOntario
$414
American Airlines
May 7
ONT10:26 pmOntario
9h 50m
1 stop
EYW11:16 amKey West
May 14
EYW2:01 pmKey West
10h 06m
1 stop
ONT9:07 pmOntario
$434

momondo 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, momondo users made 832,500 searches. Data last updated March 10, 2026.
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

Cheapest round-trip

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

10:26 pm-11:16 am

1 stop9h 50m

Key West

Thu 5/14

11:24 am-9:07 pm

2 stops12h 43m

$409

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

11:59 pm-3:40 pm

2 stops12h 41m

Key West

Thu 5/14

11:24 am-9:07 pm

2 stops12h 43m

$414

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

10:26 pm-11:16 am

1 stop9h 50m

Key West

Thu 5/14

2:01 pm-9:07 pm

1 stop10h 06m

$434

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

11:59 pm-3:40 pm

2 stops12h 41m

Key West

Thu 5/14

2:01 pm-9:07 pm

1 stop10h 06m

$439

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

10:26 pm-11:16 am

1 stop9h 50m

Key West

Thu 5/14

11:24 am-9:07 pm

2 stops12h 43m

$473

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

11:59 pm-4:30 pm

2 stops13h 31m

Key West

Thu 5/14

11:24 am-9:07 pm

2 stops12h 43m

$478

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

10:26 pm-11:16 am

1 stop9h 50m

Key West

Thu 5/14

2:01 pm-9:07 pm

1 stop10h 06m

$498
Quickest round-trip

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Tue 4/7

6:05 am-3:57 pm

1 stop6h 52m

Key West

Tue 4/14

4:38 pm-9:50 pm

1 stop8h 12m

$499

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

7:30 am-10:58 pm

2 stops12h 28m

Key West

Thu 5/14

2:01 pm-9:07 pm

1 stop10h 06m

$503

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Thu 5/7

11:59 pm-3:40 pm

2 stops12h 41m

Key West

Thu 5/14

11:24 am-10:36 pm

2 stops14h 12m

$508

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Key West from

How to get the cheapest flight ticket from Ontario to Key West

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

What is the cheapest airline that flies from Ontario to Key West?

American Airlines, United Airlines, and Delta are the most popular carriers operating from Ontario to Key West

When to book flights from Ontario to Key West

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Key West according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Key West (ONT to EYW) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Key West

Fastest flight time

6h 42m

Direct flights

None
The fastest flight from Ontario to Key West takes 6h 42m
There are no direct flights from Ontario to Key West. There are no popular flight routes from Ontario to Key West.
Search flight deals

  • How far is Ontario to Key West by plane?

    The straight-line distance from Ontario to Key West is 2243.1 mi. Typically, this will take 6h 42m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to Key West Airport?

    Prices for flights from Ontario Airport to Key West Airport are updated daily.

  • How old do you have to be to fly from Ontario Airport to Key West Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to Key West Airport.

  • What documentation or ID do you need to fly to Key West Airport?

    The travel and health documents required for your trip to Key West Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Key West Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Key West?

Book flights to Key West if you plan to visit one of these locations
Big Pine Key
Little Torch Key

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Key West?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Key West from Ontario.

Can I find flights from Ontario to Key West with flexible booking policies on momondo?

All flight searches from Ontario to Key West on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Key West?

Once all potential Ontario to Key West flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Ontario to Key West right now. Can momondo alert me if prices change?

Price alerts on flights to Key West from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Key West trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 4/9
Thu 4/16
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States