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Cheap flights from Ontario to Key West from $343

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 10/8. 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

Find the cheapest flights from Ontario to Key West

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:05 pm - 10:58 am
ONT
-
EYW
14h 53m
2 stops
Delta Logo
7:00 am - 4:12 pm
EYW
-
ONT
12h 12m
2 stops
$454Delta
Sat, Nov 7 - Thu, Nov 12
American Airlines Logo
5:34 am - 4:54 pm
ONT
-
EYW
8h 20m
1 stop
American Airlines Logo
4:41 pm - 10:34 pm
EYW
-
ONT
8h 53m
1 stop
$456American Airlines
Sat, Jul 4 - Fri, Jul 10
Delta Logo
10:59 pm - 10:58 am
ONT
-
EYW
8h 59m
1 stop
Delta Logo
7:00 am - 4:12 pm
EYW
-
ONT
12h 12m
2 stops
$480Delta
Fri, Nov 6 - Thu, Nov 12
Delta Logo
5:05 pm - 10:58 am
ONT
-
EYW
14h 53m
2 stops
Delta Logo
2:35 pm - 10:14 pm
EYW
-
ONT
10h 39m
1 stop
$495Delta
Sat, Nov 7 - Wed, Nov 11
American Airlines Logo
6:10 am - 4:29 pm
ONT
-
EYW
7h 19m
1 stop
American Airlines Logo
2:50 pm - 9:11 pm
EYW
-
ONT
9h 21m
1 stop
$497American Airlines
Sat, Nov 7 - Sat, Nov 14
American Airlines Logo
6:10 am - 4:29 pm
ONT
-
EYW
7h 19m
1 stop
American Airlines Logo
4:26 pm - 11:57 pm
EYW
-
ONT
10h 31m
2 stops
$502American Airlines
Sat, Nov 7 - Sat, Nov 14
Delta Logo
10:59 pm - 10:58 am
ONT
-
EYW
8h 59m
1 stop
Delta Logo
2:35 pm - 10:14 pm
EYW
-
ONT
10h 39m
1 stop
$510Delta
Fri, Nov 6 - Thu, Nov 12
American Airlines Logo
5:34 am - 4:54 pm
ONT
-
EYW
8h 20m
1 stop
American Airlines Logo
4:41 pm - 10:34 pm
EYW
-
ONT
8h 53m
1 stop
$512American Airlines
Sat, Jul 4 - Fri, Jul 10
Delta Logo
10:59 pm - 10:58 am
ONT
-
EYW
8h 59m
1 stop
Delta Logo
2:35 pm - 10:14 pm
EYW
-
ONT
10h 39m
1 stop
$521Delta
Fri, Nov 6 - Wed, Nov 11
American Airlines Logo
5:34 am - 7:23 pm
ONT
-
EYW
10h 49m
2 stops
American Airlines Logo
4:41 pm - 10:34 pm
EYW
-
ONT
8h 53m
1 stop
$532American Airlines
Sat, Jul 4 - Fri, Jul 10

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Delta flights from Ontario to Key West

Our best Delta deals on Ontario to Key West flight tickets
Delta
Nov 7
ONT5:05 pmOntario
14h 53m
2 stops
EYW10:58 amKey West
Nov 12
EYW7:00 amKey West
12h 12m
2 stops
ONT4:12 pmOntario
$454
Delta
Nov 6
ONT10:59 pmOntario
8h 59m
1 stop
EYW10:58 amKey West
Nov 12
EYW7:00 amKey West
12h 12m
2 stops
ONT4:12 pmOntario
$480
Delta
Nov 7
ONT5:05 pmOntario
14h 53m
2 stops
EYW10:58 amKey West
Nov 11
EYW2:35 pmKey West
10h 39m
1 stop
ONT10:14 pmOntario
$495

American Airlines flights from Ontario to Key West

Our best American Airlines deals on Ontario to Key West flight tickets
American Airlines
Jul 4
ONT5:34 amOntario
8h 20m
1 stop
EYW4:54 pmKey West
Jul 10
EYW4:41 pmKey West
8h 53m
1 stop
ONT10:34 pmOntario
$456
American Airlines
Nov 7
ONT6:10 amOntario
7h 19m
1 stop
EYW4:29 pmKey West
Nov 14
EYW2:50 pmKey West
9h 21m
1 stop
ONT9:11 pmOntario
$497
American Airlines
Nov 7
ONT6:10 amOntario
7h 19m
1 stop
EYW4:29 pmKey West
Nov 14
EYW4:26 pmKey West
10h 31m
2 stops
ONT11:57 pmOntario
$502

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 June 11, 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

Sat 11/7

5:05 pm-10:58 am

2 stops14h 53m

Key West

Thu 11/12

7:00 am-4:12 pm

2 stops12h 12m

$454

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 7/4

5:34 am-4:54 pm

1 stop8h 20m

Key West

Fri 7/10

4:41 pm-10:34 pm

1 stop8h 53m

$456

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 11/6

10:59 pm-10:58 am

1 stop8h 59m

Key West

Thu 11/12

7:00 am-4:12 pm

2 stops12h 12m

$480

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 11/7

5:05 pm-10:58 am

2 stops14h 53m

Key West

Wed 11/11

2:35 pm-10:14 pm

1 stop10h 39m

$495
Quickest round-trip

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 11/7

6:10 am-4:29 pm

1 stop7h 19m

Key West

Sat 11/14

2:50 pm-9:11 pm

1 stop9h 21m

$497

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 11/7

6:10 am-4:29 pm

1 stop7h 19m

Key West

Sat 11/14

4:26 pm-11:57 pm

2 stops10h 31m

$502

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 11/6

10:59 pm-10:58 am

1 stop8h 59m

Key West

Thu 11/12

2:35 pm-10:14 pm

1 stop10h 39m

$510

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 7/4

5:34 am-4:54 pm

1 stop8h 20m

Key West

Fri 7/10

4:41 pm-10:34 pm

1 stop8h 53m

$512

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Fri 11/6

10:59 pm-10:58 am

1 stop8h 59m

Key West

Wed 11/11

2:35 pm-10:14 pm

1 stop10h 39m

$521

OntarioKey West

ONT - EYW

ONTEYW

Ontario

Sat 7/4

5:34 am-7:23 pm

2 stops10h 49m

Key West

Fri 7/10

4:41 pm-10:34 pm

1 stop8h 53m

$532

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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?

Delta is the most popular carrier 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

8h 59m

Direct flights

None
The fastest flight from Ontario to Key West takes 8h 59m
There are no direct flights from Ontario to Key West. There are no popular flight routes from Ontario to Key West.
Search flight deals

Frequently asked questions about flying from Ontario to Key West

  • 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 8h 59m 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.

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