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Cheap flights from Montreal to Key Largo from C$ 264

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 21/10. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — MIA
28 Aug — 4 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Key Largo are usually found in June or January, booked 49 days in advance, depart on a Sunday or Tuesday and return on a Thursday

Cheap flight deals from Montreal to Key Largo

Enter your travel dates to find the best prices.

Cheapest flights from Montreal to Key Largo
Explore the most affordable flight options available from Montreal to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 July 2026.

Tue 8/96:30 p.m.
YUL
-
MIA
Nonstop3h 47m
Air Canada
Tue 15/97:55 a.m.
MIA
-
YUL
Nonstop3h 33m
Air Canada
Deal found 24/7C$ 425
Wed 21/106:50 p.m.
YUL
-
MIA
1 stop6h 03m
Delta
Wed 28/104:20 p.m.
MIA
-
YUL
1 stop7h 39m
Delta
Deal found 25/7C$ 430
Wed 14/102:25 p.m.
YUL
-
MIA
1 stop6h 18m
Delta
Sat 17/108:00 a.m.
MIA
-
YUL
1 stop8h 16m
Delta
Deal found 24/7C$ 432
Wed 18/117:05 p.m.
YUL
-
MIA
Nonstop4h 06m
Air Canada
Wed 2/121:15 p.m.
MIA
-
YUL
Nonstop3h 40m
Air Canada
Deal found 26/7C$ 439
Tue 25/82:29 p.m.
YUL
-
MIA
1 stop6h 32m
Delta
Tue 1/93:59 p.m.
MIA
-
YUL
1 stop7h 53m
Delta
Deal found 28/7C$ 443
Tue 22/92:25 p.m.
YUL
-
MIA
1 stop6h 22m
Delta
Tue 29/91:12 p.m.
MIA
-
YUL
1 stop10h 15m
Delta
Deal found 28/7C$ 446
Wed 19/86:51 p.m.
YUL
-
MIA
1 stop5h 56m
Delta
Tue 25/82:08 p.m.
MIA
-
YUL
1 stop9h 44m
Delta
Deal found 27/7C$ 447
Tue 25/86:30 p.m.
YUL
-
MIA
Nonstop3h 41m
Air Canada
Tue 1/98:15 a.m.
MIA
-
YUL
Nonstop3h 28m
Air Canada
Deal found 28/7C$ 449
Wed 21/106:30 p.m.
YUL
-
MIA
Nonstop3h 47m
Air Canada
Wed 28/108:00 a.m.
MIA
-
YUL
Nonstop3h 32m
Air Canada
Deal found 25/7C$ 453
Wed 19/86:00 a.m.
YUL
-
MIA
1 stop6h 13m
Air Canada
Wed 26/88:15 a.m.
MIA
-
YUL
Nonstop3h 28m
Air Canada
Deal found 25/7C$ 457

Find flight deals from Montreal to Key Largo

Keep the following information in mind while searching for Montreal to Key Largo flight deals. Data was last updated 29 July 2026.

Round-trip from

C$ 425

One-way from

C$ 264

Popular in

December

Cheapest in

June

Average price

C$ 619
Air Canada
  • Air Canada
  • 8/9-15/9
  • Nonstop
  • 7h 20m total
  • Montreal to Key Largo
Search Deals
Air Canada
  • Air Canada
  • 21/10
  • Nonstop
  • 3h 47m total
  • Montreal to Key Largo
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Montreal 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 29 July 2026.
Use the filters below to find and compare flights from Montreal 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

Tue 3/11

11:15 a.m.-8:35 p.m.

1 stop9h 20m

Miami

Tue 10/11

3:35 p.m.-11:51 p.m.

1 stop8h 16m

C$ 447

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 19/8

6:00 a.m.-12:17 p.m.

1 stop6h 17m

Miami

Wed 26/8

8:25 a.m.-5:46 p.m.

1 stop9h 21m

C$ 447

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 25/8

6:00 a.m.-12:17 p.m.

1 stop6h 17m

Miami

Thu 3/9

1:30 p.m.-11:30 p.m.

1 stop10h 00m

C$ 474

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sat 3/10

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

1 stop12h 52m

Miami

Sat 31/10

7:00 a.m.-9:17 p.m.

1 stop14h 17m

C$ 495

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 14/9

6:47 p.m.-12:55 a.m.

1 stop6h 08m

Miami

Mon 21/9

9:00 a.m.-6:53 p.m.

1 stop9h 53m

C$ 501

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sun 24/1

12:45 p.m.-8:54 p.m.

1 stop8h 09m

Miami

Thu 4/2

8:05 a.m.-5:03 p.m.

1 stop8h 58m

C$ 501

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sun 25/10

7:00 a.m.-4:45 p.m.

1 stop9h 45m

Miami

Sat 7/11

7:10 a.m.-1:39 p.m.

1 stop6h 29m

C$ 504

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 12/8

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

1 stop5h 56m

Miami

Mon 17/8

8:25 a.m.-5:46 p.m.

1 stop9h 21m

C$ 504

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sun 6/12

7:00 a.m.-5:29 p.m.

1 stop10h 29m

Miami

Fri 18/12

2:03 p.m.-11:58 p.m.

1 stop9h 55m

C$ 530
Quickest round-trip

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Fri 11/9

9:30 a.m.-6:24 p.m.

1 stop8h 54m

Miami

Fri 18/9

6:00 p.m.-11:50 p.m.

1 stop5h 50m

C$ 530

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/7

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Montreal to Key Largo

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

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

Find hourly flight availability from Montreal 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 29 July 2026.

One of the essential ways to save on airfare from Montreal to Key Largo is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 31% on airfare.

Weekly flight availability from Montreal to Key Largo

Explore weekly flight availability from Montreal 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 29 July 2026.

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

How much does it cost to fly round-trip from Montreal to Key Largo?

Airfare is below average for this route at the moment.
Montreal to Key Largo flights typically cost between C$ 480 and C$ 659 in September.
The cheapest round-trip price found within the last 5 days was C$ 425 on Air Canada (8 Sep-15 Sep).

What is the cheapest day to fly from Montreal to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from Montreal to Key Largo. Price data was last updated on 25 July 2026.

Travelers seeking maximum savings on their Montreal to Key Largo flight should consider departing on Monday evenings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Largo. Reviews last updated 29 July 2026.
Check out reviews from past customers who have flown with Porter Airlines,Delta, andWestJet from Montreal to Key Largo to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
449 reviews
Check prices

Food

7.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Porter Airlines
8.0
Very good
449 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Food

7.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Delta
7.8
Good
8,486 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Food

7.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
WestJet
7.2
Good
3,415 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Food

7.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
American Airlines
7.1
Good
11,840 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Food

7.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air Canada
7.1
Good
11,404 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Food

7.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Related info for your journey

Find useful and relevant information for your journey from Montreal 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 Montreal to Key Largo?

    A quick flight from Montreal to Key Largo can take about 9h 20m. Delta provides one of the quickest options available for as low as C$ 447. The distance between Montreal and Key Largo is about 2261 km. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Montreal to Key Largo one-way?

    For one-way options, check prices for Porter Airlines. According to our data, you can fly for as low as C$ 184. Users have also found prices from C$ 236 and C$ 248 on Delta and Air Canada, respectively.

  • What are the most reliable airlines from Montreal to Key Largo?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Montreal to Key Largo on time: Qatar Airways (94%), American Airlines (88%), Porter Airlines (88%).

  • What are the cheapest flights from Montreal to Key Largo?

    While on average a flight from Montreal to Key Largo is generally C$ 1,127, our data shows the cheapest flight currently is C$ 305. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Miami), you can expect to pay C$ 430 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Montreal 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 Montreal to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Montreal to Key Largo

Discover the top 7 airlines that operate flights from Montreal 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 29 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 158AverageC$ 536FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Porter AirlinesCheapestC$ 162AverageC$ 533FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air TransatCheapestC$ 176AverageC$ 437FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
American AirlinesCheapestC$ 180AverageC$ 434FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 186AverageC$ 459FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapestC$ 186AverageC$ 512FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 207AverageC$ 588FlexibilityNo cancel feeOn-time60%
Search WestJet 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 Montreal to Key Largo?

Cheapflights makes it easy to find Montreal to Key Largo flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Montreal to Key Largo for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Yes! Cheapflights helps users easily find flights from Montreal to Key Largo with no change fees.

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

Yes! Start tracking prices for Montreal to Key Largo flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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