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Cheap flights from Montreal to Key Largo from C$ 254

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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — MIA
21 Nov — 28 Nov1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Montreal to Key Largo are usually found in April or June, booked 64 days in advance, depart on a Wednesday or Thursday and return on a Saturday

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 22 October 2025.

Round-trip from

C$ 441

One-way from

C$ 254

Popular in

December

Cheapest in

April

Average price

C$ 543
Air Canada
  • Air Canada
  • 16/11-28/11
  • 1 total stop
  • 12h 11m total
  • Montreal to Key Largo
Search Deals
Porter Airlines
  • Porter Airlines
  • 5/3
  • 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$ 37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find 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 22 October 2025.

Sun 16/117:40 a.m.YUL - MIA
Nonstop3h 59mAir Canada
Fri 28/114:20 p.m.MIA - YUL
1 stop8h 12mAir Canada
Deal found 20/10C$ 441
Sun 16/116:45 a.m.YUL - MIA
1 stop6h 24mPorter Airlines
Fri 28/112:10 p.m.MIA - YUL
1 stop8h 10mPorter Airlines
Deal found 20/10C$ 444
Thu 20/116:30 p.m.YUL - MIA
Nonstop3h 59mAir Canada
Thu 27/1112:25 p.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 21/10C$ 445
Fri 5/126:45 a.m.YUL - MIA
1 stop6h 24mPorter Airlines
Fri 12/122:10 p.m.MIA - YUL
1 stop8h 15mPorter Airlines
Deal found 21/10C$ 446
Fri 14/116:45 a.m.YUL - MIA
2 stops11h 01mMultiple Airlines
Tue 18/1110:15 p.m.MIA - YUL
1 stop18h 10mMultiple Airlines
Deal found 20/10C$ 448
Mon 10/116:45 a.m.YUL - MIA
2 stops11h 58mMultiple Airlines
Sat 15/1110:15 p.m.MIA - YUL
1 stop18h 10mMultiple Airlines
Deal found 20/10C$ 449
Sun 7/128:35 a.m.YUL - MIA
Nonstop3h 59mAir Canada
Wed 10/128:00 a.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 20/10C$ 452
Tue 25/118:50 a.m.YUL - MIA
2 stops11h 26mAir Canada
Fri 28/1112:25 p.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 19/10C$ 453
Wed 26/117:40 a.m.YUL - MIA
Nonstop3h 59mAir Canada
Wed 26/114:20 p.m.MIA - YUL
1 stop7h 02mAir Canada
Deal found 20/10C$ 456
Sun 2/116:30 p.m.YUL - MIA
Nonstop3h 59mAir Canada
Fri 7/118:00 a.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 20/10C$ 458
Thu 13/116:45 a.m.YUL - MIA
2 stops11h 58mMultiple Airlines
Tue 18/1110:15 p.m.MIA - YUL
1 stop18h 10mMultiple Airlines
Deal found 20/10C$ 459

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 22 October 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 2/12

3:00 p.m.-11:59 p.m.

1 stop8h 59m

Miami

Tue 9/12

7:30 a.m.-1:28 p.m.

1 stop5h 58m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 11/11

7:00 a.m.-2:35 p.m.

1 stop7h 35m

Miami

Wed 19/11

5:26 p.m.-11:26 p.m.

1 stop6h 00m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 11/11

7:00 a.m.-11:04 p.m.

1 stop16h 04m

Miami

Tue 18/11

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

Nonstop3h 39m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 12/11

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

1 stop8h 04m

Miami

Tue 18/11

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

1 stop7h 23m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sat 6/12

2:59 p.m.-12:46 a.m.

1 stop9h 47m

Miami

Sat 13/12

6:00 a.m.-1:54 p.m.

1 stop7h 54m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 10/11

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

1 stop8h 47m

Miami

Wed 26/11

8:05 a.m.-3:55 p.m.

1 stop7h 50m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sun 14/12

7:00 a.m.-2:41 p.m.

1 stop7h 41m

Miami

Wed 24/12

8:45 a.m.-3:16 p.m.

1 stop6h 31m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 3/12

12:40 p.m.-6:26 p.m.

1 stop5h 46m

Miami

Thu 18/12

8:05 a.m.-5:25 p.m.

1 stop9h 20m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 12/11

6:00 a.m.-2:50 p.m.

1 stop8h 50m

Miami

Wed 19/11

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

1 stop7h 23m

C$ 493

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 11/3

9:28 a.m.-8:50 p.m.

1 stop11h 22m

Miami

Tue 17/3

10:20 a.m.-5:04 p.m.

1 stop6h 44m

C$ 493

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/10

Showing 1-10 of 23 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 17 October 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, February is the cheapest month in which you can book a flight from Montreal to Key Largo (average of C$ 118). Flying from Montreal to Key Largo in July is currently the most expensive (average of C$ 202). 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 22 October 2025.

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 morning tend to be the most expensive. A flight in the evening could potentially save you up to 45% on airfare.

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 Monday afternoons when fares are most often at their lowest. Saturday at noon 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 22 October 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
8.0
Very good
382 reviews
Check prices

Boarding

8.2

Crew

8.6

Food

7.6

Overall

8.0

Comfort

8.0

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
8.0
Very good
382 reviews
Porter Airlines
8.0
Very good
382 reviews
Check prices

Boarding

8.2

Crew

8.6

Food

7.6

Overall

8.0

Comfort

8.0

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
8,988 reviews
Porter Airlines
8.0
Very good
382 reviews
Check prices

Boarding

8.2

Crew

8.6

Food

7.6

Overall

8.0

Comfort

8.0

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
11,028 reviews
Porter Airlines
8.0
Very good
382 reviews
Check prices

Boarding

8.2

Crew

8.6

Food

7.6

Overall

8.0

Comfort

8.0

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
3,132 reviews
Porter Airlines
8.0
Very good
382 reviews
Check prices

Boarding

8.2

Crew

8.6

Food

7.6

Overall

8.0

Comfort

8.0

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
10,335 reviews
Porter Airlines
8.0
Very good
382 reviews
Check prices

Boarding

8.2

Crew

8.6

Food

7.6

Overall

8.0

Comfort

8.0

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 7h 35m. United Airlines provides one of the quickest options available for as low as C$ 493. 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 American Airlines. According to our data, you can fly for as low as C$ 267. Users have also found prices from C$ 278 and C$ 279 on Porter Airlines 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: American Airlines (100%), Qatar Airways (100%), Air Canada (87%).

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

    While on average a flight from Montreal to Key Largo is generally C$ 602, our data shows the cheapest flight currently is C$ 280. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Miami), you can expect to pay C$ 431 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, February is the cheapest month in which you can book a flight from Montreal to Key Largo (average of C$ 118). Flying from Montreal to Key Largo in July is currently the most expensive (average of C$ 202). 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 22 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Flair AirlinesCheapestC$ 117AverageC$ 290FlexibilityNo cancel feeOn-timeN/A
Search Flair Airlines flights
American AirlinesCheapestC$ 152AverageC$ 409FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 153AverageC$ 430FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 171AverageC$ 374FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 178AverageC$ 457FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air TransatCheapestC$ 197AverageC$ 394FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
WestJetCheapestC$ 227AverageC$ 570FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 241AverageC$ 436FlexibilityNo 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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