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Cheap flights from Montreal to Key Largo from C$ 229

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 27/10. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — MIA
16 Oct — 23 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Montreal to Key Largo are usually found in April or June, booked 40 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap 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 16 September 2025.

Round-trip from

C$ 377

One-way from

C$ 229

Popular in

December

Cheapest in

April

Average price

C$ 477
American Airlines
  • American Airlines
  • 21/10-22/10
  • 3 total stops
  • 14h 36m total
  • Montreal to Key Largo
Search Deals
Porter Airlines
  • Porter Airlines
  • 27/10
  • 1 total stop
  • 6h 24m total
  • Montreal to Key Largo
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Montreal to Key Largo

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 16 September 2025.

Mon 22/910:38 a.m.YUL - MIA
1 stop5h 38mAmerican Airlines
Tue 23/97:06 a.m.MIA - YUL
2 stops8h 27mAmerican Airlines
Deal found 15/9C$ 377
Tue 21/107:29 a.m.YUL - MIA
1 stop6h 16mAmerican Airlines
Wed 22/107:00 a.m.MIA - YUL
2 stops8h 20mAmerican Airlines
Deal found 16/9C$ 392
Sun 9/116:45 a.m.YUL - MIA
1 stop6h 24mMultiple Airlines
Mon 10/1111:28 a.m.MIA - YUL
2 stops13h 15mMultiple Airlines
Deal found 14/9C$ 401
Mon 27/106:30 p.m.YUL - MIA
Nonstop3h 59mAir Canada
Tue 4/118:00 a.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 14/9C$ 403
Tue 14/1010:45 a.m.YUL - MIA
2 stops12h 25mMultiple Airlines
Wed 15/109:49 a.m.MIA - YUL
1 stop8h 06mMultiple Airlines
Deal found 15/9C$ 405
Sun 26/106:45 a.m.YUL - MIA
1 stop6h 24mPorter Airlines
Mon 3/112:10 p.m.MIA - YUL
1 stop8h 00mPorter Airlines
Deal found 14/9C$ 406
Fri 31/106:45 a.m.YUL - MIA
1 stop6h 24mMultiple Airlines
Mon 3/116:00 a.m.MIA - YUL
2 stops18h 43mMultiple Airlines
Deal found 14/9C$ 410
Sun 26/106:45 a.m.YUL - MIA
1 stop6h 24mPorter Airlines
Sat 1/112:10 p.m.MIA - YUL
1 stop8h 00mPorter Airlines
Deal found 14/9C$ 413
Sat 25/106:45 a.m.YUL - MIA
1 stop6h 20mPorter Airlines
Sat 1/112:10 p.m.MIA - YUL
1 stop8h 00mPorter Airlines
Deal found 14/9C$ 416
Sat 25/106:45 a.m.YUL - MIA
1 stop6h 20mPorter Airlines
Mon 1/122:10 p.m.MIA - YUL
1 stop8h 00mPorter Airlines
Deal found 14/9C$ 417
Tue 21/109:30 a.m.YUL - MIA
Nonstop3h 50mAir Canada
Wed 22/102:25 p.m.MIA - YUL
Nonstop3h 36mAir Canada
Deal found 15/9C$ 419
Thu 6/115:10 p.m.YUL - MIA
1 stop16h 52mMultiple Airlines
Mon 17/1111:28 a.m.MIA - YUL
2 stops13h 15mMultiple Airlines
Deal found 14/9C$ 420

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 16 September 2025.
Use the filters below to find and compare flights from Montreal to Key Largo that are best for you.

Fly from

Montreal

Fly to

Key Largo

Route

Depart

Return

Price

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 24/2

6:00 a.m.-5:20 p.m.

1 stop11h 20m

Miami

Tue 3/3

7:00 a.m.-5:04 p.m.

1 stop10h 04m

C$ 438

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 11/3

7:00 a.m.-5:24 p.m.

1 stop10h 24m

Miami

Tue 17/3

2:03 p.m.-11:54 p.m.

1 stop9h 51m

C$ 438

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sun 25/1

7:00 a.m.-3:47 p.m.

1 stop8h 47m

Miami

Fri 30/1

7:00 a.m.-5:04 p.m.

1 stop10h 04m

C$ 438

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 26/1

6:00 a.m.-5:20 p.m.

1 stop11h 20m

Miami

Wed 4/2

2:03 p.m.-11:54 p.m.

1 stop9h 51m

C$ 439

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 27/1

6:15 p.m.-12:25 a.m.

1 stop6h 10m

Miami

Wed 4/2

7:30 a.m.-1:38 p.m.

1 stop6h 08m

C$ 439

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 30/9

6:00 a.m.-6:51 p.m.

1 stop12h 51m

Miami

Wed 4/2

8:00 a.m.-11:39 a.m.

Nonstop3h 39m

C$ 466

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sat 15/11

6:45 a.m.-1:09 p.m.

1 stop6h 24m

Miami

Mon 24/11

2:10 p.m.-10:10 p.m.

1 stop8h 00m

C$ 467

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 23/10

6:00 a.m.-12:18 p.m.

1 stop6h 18m

Miami

Sat 1/11

6:45 a.m.-2:00 p.m.

1 stop7h 15m

C$ 479

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 27/10

7:00 a.m.-2:37 p.m.

1 stop7h 37m

Miami

Tue 4/11

6:05 a.m.-1:28 p.m.

1 stop7h 23m

C$ 479

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sat 8/11

3:00 p.m.-11:04 p.m.

1 stop8h 04m

Miami

Thu 20/11

6:05 a.m.-1:28 p.m.

1 stop7h 23m

C$ 479

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/9

Showing 1-10 of 21 results
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2
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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

How far ahead should I book a flight from Montreal to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from Montreal to Key Largo. Price data was last updated on 12 September 2025.

Booking 40 days in advance of your planned departure date is, on average, the best time to get cheap flights from Montreal to Key Largo. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Montreal to Key Largo?

Currently, April is the cheapest month in which you can book a flight from Montreal to Key Largo (average of C$ 251). Flying from Montreal to Key Largo in August is currently the most expensive (average of C$ 369). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 16 September 2025.

When flying from Montreal to Key Largo, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 16 December 2024.

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

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 16 September 2025.

The most flights from YMQ to KE9 are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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

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 16 September 2025.
Check out reviews from past customers who have flown with Porter Airlines,United Airlines, andAmerican Airlines 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
7.9
Good
363 reviews
Check prices

Overall

7.9

Crew

8.6

Boarding

8.1

Comfort

7.9

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Crew

8.6

Boarding

8.1

Comfort

7.9

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,924 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Crew

8.6

Boarding

8.1

Comfort

7.9

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
American Airlines
7.2
Good
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Crew

8.6

Boarding

8.1

Comfort

7.9

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
WestJet
7.2
Good
3,093 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Crew

8.6

Boarding

8.1

Comfort

7.9

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Overall

7.9

Crew

8.6

Boarding

8.1

Comfort

7.9

Food

7.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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 11h 20m. Delta provides one of the quickest options available for as low as C$ 438. The distance between Montreal and Key Largo is about 2261 km.

  • 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: American Airlines (91%), Qatar Airways (91%), Air Canada (79%).

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

    While on average a flight from Montreal to Key Largo is generally C$ 1,013, our data shows the cheapest flight currently is C$ 245. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Miami), you can expect to pay C$ 387 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.

  • What is the cheapest month to book a flight from Montreal to Key Largo?

    Currently, April is the cheapest month in which you can book a flight from Montreal to Key Largo (average of C$ 251). Flying from Montreal to Key Largo in August is currently the most expensive (average of C$ 369). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 8 airlines flying from Montreal to Key Largo

Discover the top 8 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 16 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Flair AirlinesCheapestC$ 115AverageC$ 289FlexibilityNo cancel feeOn-timeN/A
Search Flair Airlines flights
United AirlinesCheapestC$ 146AverageC$ 422FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapestC$ 150AverageC$ 402FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Porter AirlinesCheapestC$ 169AverageC$ 359FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 178AverageC$ 446FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air TransatCheapestC$ 193AverageC$ 391FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
WestJetCheapestC$ 226AverageC$ 603FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 239AverageC$ 431FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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