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Cheap flights from Ontario to Key Largo from C$ 246

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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — MIA
18 Jul — 25 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Key Largo

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Key Largo
Explore the most affordable flight options available from Ontario to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 June 2026.

Tue 29/96:30 p.m.
YUL
-
MIA
Nonstop3h 47m
Air Canada
Wed 7/108:15 a.m.
MIA
-
YUL
Nonstop3h 30m
Air Canada
Deal found 15/6C$ 398
Mon 31/86:30 p.m.
YUL
-
MIA
Nonstop3h 41m
Air Canada
Fri 4/96:00 p.m.
MIA
-
YUL
Nonstop3h 35m
Air Canada
Deal found 14/6C$ 401
Sun 4/106:30 p.m.
YUL
-
MIA
Nonstop3h 47m
Air Canada
Wed 7/108:15 a.m.
MIA
-
YUL
Nonstop3h 30m
Air Canada
Deal found 16/6C$ 405
Mon 13/76:30 p.m.
YUL
-
MIA
Nonstop3h 41m
Air Canada
Tue 21/76:00 p.m.
MIA
-
YUL
Nonstop3h 35m
Air Canada
Deal found 15/6C$ 407
Sat 5/97:14 a.m.
YUL
-
MIA
Nonstop3h 43m
American Airlines
Fri 11/96:16 p.m.
MIA
-
YUL
1 stop15h 33m
American Airlines
Deal found 17/6C$ 419
Thu 5/119:35 a.m.
YYZ
-
MIA
Nonstop3h 30m
Air Transat
Mon 9/112:05 p.m.
MIA
-
YYZ
Nonstop3h 20m
Air Transat
Deal found 14/6C$ 422
Sun 11/109:40 a.m.
YYZ
-
MIA
Nonstop3h 29m
Air Transat
Fri 16/102:10 p.m.
MIA
-
YYZ
Nonstop3h 20m
Air Transat
Deal found 17/6C$ 442
Tue 8/96:00 a.m.
YYZ
-
MIA
Nonstop3h 33m
American Airlines
Tue 15/97:58 p.m.
MIA
-
YYZ
Nonstop3h 25m
American Airlines
Deal found 17/6C$ 453
Wed 15/79:00 a.m.
YYZ
-
MIA
1 stop8h 01m
Air Canada
Wed 22/79:45 p.m.
MIA
-
YYZ
Nonstop3h 14m
Air Canada
Deal found 16/6C$ 473
Thu 10/912:50 p.m.
YYZ
-
MIA
1 stop6h 12m
American Airlines
Wed 23/97:58 p.m.
MIA
-
YYZ
Nonstop3h 25m
American Airlines
Deal found 16/6C$ 476
Thu 9/77:55 a.m.
YYZ
-
MIA
1 stop6h 29m
WestJet
Thu 9/76:00 p.m.
MIA
-
YYZ
1 stop5h 58m
WestJet
Deal found 16/6C$ 481
Sat 18/76:30 a.m.
YYZ
-
MIA
1 stop14h 18m
WestJet
Sat 25/77:00 a.m.
MIA
-
YYZ
1 stop16h 13m
WestJet
Deal found 17/6C$ 487

Find flight deals from Ontario to Key Largo

Keep the following information in mind while searching for Ontario to Key Largo flight deals. Data was last updated 18 June 2026.

Round-trip from

C$ 398

One-way from

C$ 246

Popular in

August

Cheapest in

June

Average price

C$ 483
Air Canada
  • Air Canada
  • 29/9-7/10
  • Nonstop
  • 7h 17m total
  • Ontario to Key Largo
Search Deals
GOL
  • GOL
  • 3/9
  • Nonstop
  • 3h 18m total
  • Ontario to Key Largo
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Key Largo 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 629,999 searches. Data last updated 18 June 2026.
Use the filters below to find and compare flights from Ontario to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 24/9

12:44 p.m.-6:29 p.m.

1 stop5h 45m

Miami

Tue 29/9

1:07 p.m.-11:22 p.m.

1 stop10h 15m

C$ 445

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 9/9

11:23 a.m.-11:52 p.m.

1 stop12h 29m

Miami

Thu 10/9

8:45 a.m.-4:10 p.m.

1 stop7h 25m

C$ 445

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 15/7

3:25 p.m.-11:22 p.m.

1 stop7h 57m

Miami

Mon 20/7

12:30 p.m.-9:26 p.m.

1 stop8h 56m

C$ 460

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sat 15/8

6:00 a.m.-2:46 p.m.

1 stop8h 46m

Miami

Wed 19/8

7:00 a.m.-1:09 p.m.

1 stop6h 09m

C$ 460

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 2/7

9:45 a.m.-10:27 p.m.

1 stop12h 42m

Miami

Thu 9/7

6:00 p.m.-9:35 p.m.

Nonstop3h 35m

C$ 462

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 13/7

7:00 a.m.-4:55 p.m.

1 stop9h 55m

Miami

Wed 15/7

8:15 a.m.-6:54 p.m.

1 stop10h 39m

C$ 462

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 29/7

6:10 a.m.-10:27 p.m.

1 stop16h 17m

Miami

Wed 5/8

8:15 a.m.-11:43 a.m.

Nonstop3h 28m

C$ 462

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 13/7

7:00 a.m.-4:55 p.m.

1 stop9h 55m

Miami

Tue 21/7

6:00 p.m.-11:52 p.m.

1 stop5h 52m

C$ 462

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 2/7

9:45 a.m.-10:27 p.m.

1 stop12h 42m

Miami

Tue 7/7

6:00 p.m.-9:35 p.m.

Nonstop3h 35m

C$ 462

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Fri 25/9

7:00 a.m.-4:50 p.m.

1 stop9h 50m

Miami

Mon 28/9

7:10 a.m.-5:38 p.m.

1 stop10h 28m

C$ 474

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/6

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo 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 Largo

What is the cheapest time of day to fly from ON to KE9?

Find hourly flight availability from Ontario to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 June 2026.

One of the essential ways to save on airfare from Region of Ontario to Key Largo is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 11% on airfare.

Weekly flight availability from Region of Ontario to Key Largo

Explore weekly flight availability from Ontario to Key Largo. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 18 June 2026.

The most flights from CAON to KE9 are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

How much does it cost to fly round-trip from Region of Ontario to Key Largo?

What is the cheapest day to fly from Region of Ontario to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Key Largo. Price data was last updated on 13 June 2026.

Travelers seeking maximum savings on their Region of Ontario to Key Largo flight should consider departing on Thursday at noon when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Key Largo. 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 Region of Ontario to Key Largo?

    For as low as C$ 445, Delta can have you in Key Largo from Region of Ontario in 5h 45m. There are 2261 km between Region of Ontario and Key Largo. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Region of Ontario to Key Largo one-way?

    C$ 132 is the cheapest one-way deal found within the past few days, from Flair Airlines. You may also be able to find cheap deals on Porter Airlines and Air Transat, with prices starting from C$ 176 and C$ 198, respectively.

  • What are the most popular routes from Region of Ontario to Key Largo?

    The most popular route from Region of Ontario to Key Largo is Montreal Pierre Elliott Trudeau Intl - Miami. You may also consider Toronto Pearson Intl - Miami or Toronto Island - Miami.

  • What are the most reliable airlines from Region of Ontario to Key Largo?

    No one likes to see their flight delayed. When booking a flight from Region of Ontario to Key Largo consider choosing Qatar Airways (89%), Porter Airlines (82%) or Air Transat (82%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Region of Ontario to Key Largo?

    Looking at all options, your cheapest flight can be booked for C$ 233. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Miami) can be booked for C$ 428 on average, our data indicates C$ 826 when flying from Region of Ontario to Key Largo.

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

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

  • How can I find direct flights from Ontario to Key Largo?

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

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

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

See more FAQs

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Alternative routes for Ontario to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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Pierre Elliott Trudeau Intl to Miami flights
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Calgary to Miami flights
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Edmonton to Orlando flights
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Pearson Intl to Daytona Beach flights
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St. John's to Orlando flights
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Halifax to Fort Lauderdale flights

Top 9 airlines flying from Ontario to Key Largo

Discover the top 9 airlines that operate flights from Ontario to Key Largo. 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 629,999 searches. Data last updated 18 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 121AverageC$ 600FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Flair AirlinesCheapestC$ 154AverageC$ 314FlexibilityNo cancel feeOn-timeN/A
Search Flair Airlines flights
United AirlinesCheapestC$ 171AverageC$ 547FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 188AverageC$ 444FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
DeltaCheapestC$ 194AverageC$ 409FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 207AverageC$ 683FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 214AverageC$ 603FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air TransatCheapestC$ 259AverageC$ 513FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
APG AirlinesCheapestC$ 636AverageC$ 685FlexibilityNo cancel feeOn-timeN/A
Search APG Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Key Largo?

Cheapflights helps you search for flights from Ontario to Key Largo via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Key Largo?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Key Largo from Ontario.

Can Cheapflights find flights from Ontario to Key Largo with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to Key Largo, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario to Key Largo become cheaper?

Yes, Cheapflights offers price alerts on Ontario to Key Largo flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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