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Cheap flights from Ontario to Key Largo from C$ 239

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 17/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — MIA
4 Jun — 11 Jun1
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 5 May 2026.

Thu 11/67:55 a.m.
YYZ
-
MIA
1 stop10h 42m
WestJet
Mon 15/68:15 a.m.
MIA
-
YYZ
1 stop15h 25m
WestJet
Deal found 30/4C$ 397
Sun 24/57:55 a.m.
YYZ
-
MIA
1 stop10h 25m
WestJet
Wed 27/511:58 a.m.
MIA
-
YYZ
1 stop5h 17m
WestJet
Deal found 1/5C$ 399
Thu 11/62:32 p.m.
YYZ
-
MIA
1 stop8h 47m
WestJet
Thu 18/66:00 a.m.
MIA
-
YYZ
1 stop6h 25m
WestJet
Deal found 30/4C$ 403
Thu 13/85:50 p.m.
YYZ
-
MIA
1 stop12h 17m
WestJet
Fri 21/85:55 p.m.
MIA
-
YYZ
1 stop6h 09m
WestJet
Deal found 30/4C$ 404
Thu 28/512:29 p.m.
YYZ
-
MIA
1 stop10h 42m
WestJet
Thu 4/63:09 p.m.
MIA
-
YYZ
1 stop8h 05m
WestJet
Deal found 30/4C$ 408
Sun 31/56:00 a.m.
YYZ
-
MIA
1 stop12h 20m
WestJet
Sun 7/67:10 a.m.
MIA
-
YYZ
1 stop10h 09m
WestJet
Deal found 30/4C$ 410
Fri 29/52:30 p.m.
YYZ
-
MIA
1 stop8h 22m
WestJet
Wed 3/611:58 a.m.
MIA
-
YYZ
1 stop5h 17m
WestJet
Deal found 30/4C$ 411
Tue 30/61:40 p.m.
YYZ
-
MIA
1 stop8h 37m
WestJet
Tue 7/76:25 a.m.
MIA
-
YYZ
1 stop7h 16m
WestJet
Deal found 1/5C$ 415
Tue 21/76:47 p.m.
YUL
-
MIA
1 stop6h 08m
WestJet
Tue 28/710:40 a.m.
MIA
-
YUL
1 stop7h 02m
WestJet
Deal found 1/5C$ 415
Wed 27/56:30 p.m.
YUL
-
MIA
Nonstop3h 47m
Air Canada
Tue 2/66:00 p.m.
MIA
-
YUL
Nonstop3h 40m
Air Canada
Deal found 1/5C$ 416
Fri 22/54:04 p.m.
YYZ
-
MIA
1 stop25h 37m
WestJet
Fri 29/56:00 a.m.
MIA
-
YYZ
1 stop11h 15m
WestJet
Deal found 30/4C$ 418
Fri 22/56:12 p.m.
YYZ
-
MIA
1 stop23h 29m
WestJet
Mon 1/67:05 a.m.
MIA
-
YYZ
1 stop14h 50m
WestJet
Deal found 30/4C$ 419

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 5 May 2026.

Round-trip from

C$ 395

One-way from

C$ 239

Popular in

December

Cheapest in

June

Average price

C$ 445
Air Transat
  • Air Transat
  • 16/10-23/10
  • Nonstop
  • 6h 49m total
  • Ontario to Key Largo
Search Deals
Air Canada
  • Air Canada
  • 17/5
  • 2 total stops
  • 9h 52m total
  • Ontario to Key Largo
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 5 May 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

Wed 27/5

12:40 p.m.-7:58 p.m.

1 stop7h 18m

Miami

Thu 4/6

8:05 a.m.-5:43 p.m.

1 stop9h 38m

C$ 450
Quickest round-trip

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 28/5

2:29 p.m.-9:03 p.m.

1 stop6h 34m

Miami

Wed 3/6

5:51 p.m.-11:57 p.m.

1 stop6h 06m

C$ 450

TorontoMiami

YYZ - MIA

YYZMIA

Toronto Pearson Intl

Sun 24/5

7:55 a.m.-6:20 p.m.

1 stop10h 25m

Miami

Thu 28/5

5:51 p.m.-11:58 p.m.

1 stop6h 07m

C$ 453

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Fri 15/5

6:51 p.m.-12:47 a.m.

1 stop5h 56m

Miami

Sun 17/5

8:05 a.m.-5:43 p.m.

1 stop9h 38m

C$ 453

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 15/6

7:00 a.m.-5:00 p.m.

1 stop10h 00m

Miami

Mon 22/6

7:10 a.m.-5:45 p.m.

1 stop10h 35m

C$ 454

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sat 16/5

12:40 p.m.-7:58 p.m.

1 stop7h 18m

Miami

Sat 23/5

6:00 a.m.-11:35 a.m.

1 stop5h 35m

C$ 476

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 18/5

12:40 p.m.-9:27 p.m.

1 stop8h 47m

Miami

Fri 22/5

2:01 p.m.-11:57 p.m.

1 stop9h 56m

C$ 478

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 27/5

9:30 a.m.-6:20 p.m.

1 stop8h 50m

Miami

Tue 2/6

6:00 a.m.-11:35 a.m.

1 stop5h 35m

C$ 482

TorontoMiami

YYZ - MIA

YYZMIA

Toronto Pearson Intl

Sun 31/5

7:55 a.m.-6:20 p.m.

1 stop10h 25m

Miami

Sun 7/6

7:10 a.m.-5:19 p.m.

1 stop10h 09m

C$ 484

TorontoMiami

YYZ - MIA

YYZMIA

Toronto Pearson Intl

Sun 24/5

6:30 p.m.-12:43 a.m.

1 stop6h 13m

Miami

Fri 29/5

6:35 a.m.-1:40 p.m.

1 stop7h 05m

C$ 486

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/4

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 5 May 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 12% on airfare.

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 2 May 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.

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 5 May 2026.

The most flights from CAON to KE9 are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, 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?

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$ 450, Delta can have you in Key Largo from Region of Ontario in 7h 18m. 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$ 125 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$ 182 and C$ 192, 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 American Airlines (73%), GOL (72%) or Porter Airlines (67%) 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$ 194. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Miami) can be booked for C$ 464 on average, our data indicates C$ 660 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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Winnipeg to Miami flights

Top 10 airlines flying from Ontario to Key Largo

Discover the top 10 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 5 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 117AverageC$ 584FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Flair AirlinesCheapestC$ 130AverageC$ 299FlexibilityNo cancel feeOn-timeN/A
Search Flair Airlines flights
United AirlinesCheapestC$ 166AverageC$ 527FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 183AverageC$ 412FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
DeltaCheapestC$ 189AverageC$ 391FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 198AverageC$ 662FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 207AverageC$ 455FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air TransatCheapestC$ 249AverageC$ 485FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
WestJet EncoreCheapestC$ 533AverageC$ 758FlexibilityNo cancel feeOn-timeN/A
Search WestJet Encore flights
APG AirlinesCheapestC$ 617AverageC$ 664FlexibilityNo 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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