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Cheap flights from Montreal to Key Largo from C$ 255

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 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — MIA
13 Dec — 20 Dec1
1 adult
1 adult, Economy, 0 bags

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 13 November 2025.

Round-trip from

C$ 461

One-way from

C$ 255

Popular in

December

Cheapest in

April

Average price

C$ 500
1/4-8/4
  • 1/4-8/4
  • 2 total stops
  • 21h 36m total
  • Montreal to Key Largo
Search Deals
Porter Airlines
  • Porter Airlines
  • 15/12
  • 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$ 39 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 November 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 13 November 2025.

Mon 24/112:00 p.m.YUL - MIA
1 stop6h 16mAir Canada
Wed 26/1112:20 p.m.MIA - YUL
2 stops8h 34mAir Canada
Deal found 11/11C$ 461
Thu 11/128:00 a.m.YUL - MIA
2 stops16h 46mMultiple Airlines
Tue 16/128:21 a.m.MIA - YUL
1 stop8h 04mMultiple Airlines
Deal found 11/11C$ 462
Sun 7/126:45 a.m.YUL - MIA
1 stop6h 24mMultiple Airlines
Tue 9/128:21 a.m.MIA - YUL
1 stop8h 04mMultiple Airlines
Deal found 11/11C$ 464
Sun 7/126:45 a.m.YUL - MIA
1 stop6h 24mMultiple Airlines
Mon 15/1212:26 p.m.MIA - YUL
2 stops10h 19mMultiple Airlines
Deal found 12/11C$ 465
Sun 16/118:00 a.m.YUL - MIA
1 stop7h 21mAir Canada
Wed 19/1112:20 p.m.MIA - YUL
2 stops8h 24mAir Canada
Deal found 11/11C$ 467
Tue 18/118:00 a.m.YUL - MIA
1 stop7h 21mAir Canada
Thu 20/114:20 p.m.MIA - YUL
1 stop7h 02mAir Canada
Deal found 11/11C$ 469
Wed 19/116:30 p.m.YUL - MIA
Nonstop3h 59mAir Canada
Tue 25/1112:20 p.m.MIA - YUL
1 stop7h 33mAir Canada
Deal found 10/11C$ 471
Mon 8/126:45 a.m.YUL - MIA
1 stop6h 24mMultiple Airlines
Mon 15/1212:26 p.m.MIA - YUL
2 stops10h 19mMultiple Airlines
Deal found 10/11C$ 472
Wed 26/118:00 a.m.YUL - MIA
1 stop7h 21mAir Canada
Tue 2/128:00 a.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 12/11C$ 474
Tue 18/116:30 p.m.YUL - MIA
Nonstop3h 59mAir Canada
Tue 25/114:20 p.m.MIA - YUL
1 stop8h 12mAir Canada
Deal found 11/11C$ 475
Thu 11/126:30 p.m.YUL - MIA
Nonstop3h 59mAir Canada
Tue 16/121:20 p.m.MIA - YUL
Nonstop3h 39mAir Canada
Deal found 10/11C$ 476

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 13 November 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

Fri 23/1

2:15 p.m.-9:10 p.m.

1 stop6h 55m

Miami

Sun 1/2

7:15 a.m.-4:57 p.m.

1 stop9h 42m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Tue 24/3

3:00 p.m.-11:49 p.m.

1 stop8h 49m

Miami

Wed 25/3

6:12 a.m.-1:30 p.m.

1 stop7h 18m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Fri 5/12

6:30 p.m.-12:46 a.m.

1 stop6h 16m

Miami

Thu 11/12

7:00 a.m.-5:25 p.m.

1 stop10h 25m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 22/1

12:54 p.m.-9:37 p.m.

1 stop8h 43m

Miami

Sun 1/2

7:15 a.m.-4:57 p.m.

1 stop9h 42m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Sun 1/2

12:54 p.m.-9:37 p.m.

1 stop8h 43m

Miami

Thu 12/2

10:36 a.m.-4:50 p.m.

1 stop6h 14m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Fri 1/5

6:15 p.m.-12:56 a.m.

1 stop6h 41m

Miami

Thu 7/5

7:00 a.m.-5:07 p.m.

1 stop10h 07m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Wed 31/12

11:59 a.m.-9:18 p.m.

1 stop9h 19m

Miami

Tue 13/1

9:24 a.m.-6:37 p.m.

1 stop9h 13m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Thu 27/11

7:00 a.m.-5:18 p.m.

1 stop10h 18m

Miami

Thu 4/12

5:33 p.m.-11:32 p.m.

1 stop5h 59m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

6:26 p.m.-12:46 a.m.

1 stop6h 20m

Miami

Fri 12/12

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

1 stop9h 20m

C$ 492

MontrealMiami

YUL - MIA

YULMIA

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

6:26 p.m.-12:46 a.m.

1 stop6h 20m

Miami

Sat 13/12

6:30 p.m.-11:59 p.m.

1 stop5h 29m

C$ 492

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 23 results
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

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 7 November 2025.

Booking 64 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, March 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$ 200). 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 13 November 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.

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 13 November 2025.

The most flights from YMQ to KE9 are scheduled on a Monday (4 on average). You will have fewer flight options on Tuesday, 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 13 November 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
389 reviews
Check prices

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Kelly,Nov 2025

YVR - YUL

I recently flew with Porter Airlines on Flight PD372 on October 30th, and unfortunately, had a very disappointing experience. At the gate, one of their attendants gave me two boarding passes. I assumed these were for my itinerary from Vancouver to Montreal and back, but one of the boarding passes unexpectedly included a connecting flight to Toronto, which was never part of my booking or invoice. As a result of this error, my checked baggage was mistakenly routed to Toronto. When I contacted Porter’s customer service, I spoke to an agent who apologized on behalf of the attendant (employee number 13209961) and promised to have my luggage flown back to Montreal. However, shortly after, I was told there was nothing they could do except for me to travel to Toronto myself to pick up my bag. This is highly unreasonable and unfair, considering the issue was caused by their staff printing the wrong boarding pass. This entire situation caused me significant inconvenience and stress. I expected Porter to correct the mistake and deliver my luggage as originally planned, but instead, I was left with the burden of fixing an error that was not mine. I even have a photo of the staff badge of the employee who made the promise, yet the company still failed to honor it. I hope Porter Airlines reviews their internal communication and baggage handling procedures to prevent this from happening to other passengers. Customer care and responsibility fell short in this experience, and I am still waiting for a satisfactory resolution.
Porter Airlines
8.0
Very good
389 reviews
Porter Airlines
8.0
Very good
389 reviews
Check prices

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Kelly,Nov 2025

YVR - YUL

I recently flew with Porter Airlines on Flight PD372 on October 30th, and unfortunately, had a very disappointing experience. At the gate, one of their attendants gave me two boarding passes. I assumed these were for my itinerary from Vancouver to Montreal and back, but one of the boarding passes unexpectedly included a connecting flight to Toronto, which was never part of my booking or invoice. As a result of this error, my checked baggage was mistakenly routed to Toronto. When I contacted Porter’s customer service, I spoke to an agent who apologized on behalf of the attendant (employee number 13209961) and promised to have my luggage flown back to Montreal. However, shortly after, I was told there was nothing they could do except for me to travel to Toronto myself to pick up my bag. This is highly unreasonable and unfair, considering the issue was caused by their staff printing the wrong boarding pass. This entire situation caused me significant inconvenience and stress. I expected Porter to correct the mistake and deliver my luggage as originally planned, but instead, I was left with the burden of fixing an error that was not mine. I even have a photo of the staff badge of the employee who made the promise, yet the company still failed to honor it. I hope Porter Airlines reviews their internal communication and baggage handling procedures to prevent this from happening to other passengers. Customer care and responsibility fell short in this experience, and I am still waiting for a satisfactory resolution.
United Airlines
7.4
Good
9,015 reviews
Porter Airlines
8.0
Very good
389 reviews
Check prices

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Kelly,Nov 2025

YVR - YUL

I recently flew with Porter Airlines on Flight PD372 on October 30th, and unfortunately, had a very disappointing experience. At the gate, one of their attendants gave me two boarding passes. I assumed these were for my itinerary from Vancouver to Montreal and back, but one of the boarding passes unexpectedly included a connecting flight to Toronto, which was never part of my booking or invoice. As a result of this error, my checked baggage was mistakenly routed to Toronto. When I contacted Porter’s customer service, I spoke to an agent who apologized on behalf of the attendant (employee number 13209961) and promised to have my luggage flown back to Montreal. However, shortly after, I was told there was nothing they could do except for me to travel to Toronto myself to pick up my bag. This is highly unreasonable and unfair, considering the issue was caused by their staff printing the wrong boarding pass. This entire situation caused me significant inconvenience and stress. I expected Porter to correct the mistake and deliver my luggage as originally planned, but instead, I was left with the burden of fixing an error that was not mine. I even have a photo of the staff badge of the employee who made the promise, yet the company still failed to honor it. I hope Porter Airlines reviews their internal communication and baggage handling procedures to prevent this from happening to other passengers. Customer care and responsibility fell short in this experience, and I am still waiting for a satisfactory resolution.
American Airlines
7.2
Good
11,050 reviews
Porter Airlines
8.0
Very good
389 reviews
Check prices

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Kelly,Nov 2025

YVR - YUL

I recently flew with Porter Airlines on Flight PD372 on October 30th, and unfortunately, had a very disappointing experience. At the gate, one of their attendants gave me two boarding passes. I assumed these were for my itinerary from Vancouver to Montreal and back, but one of the boarding passes unexpectedly included a connecting flight to Toronto, which was never part of my booking or invoice. As a result of this error, my checked baggage was mistakenly routed to Toronto. When I contacted Porter’s customer service, I spoke to an agent who apologized on behalf of the attendant (employee number 13209961) and promised to have my luggage flown back to Montreal. However, shortly after, I was told there was nothing they could do except for me to travel to Toronto myself to pick up my bag. This is highly unreasonable and unfair, considering the issue was caused by their staff printing the wrong boarding pass. This entire situation caused me significant inconvenience and stress. I expected Porter to correct the mistake and deliver my luggage as originally planned, but instead, I was left with the burden of fixing an error that was not mine. I even have a photo of the staff badge of the employee who made the promise, yet the company still failed to honor it. I hope Porter Airlines reviews their internal communication and baggage handling procedures to prevent this from happening to other passengers. Customer care and responsibility fell short in this experience, and I am still waiting for a satisfactory resolution.
WestJet
7.2
Good
3,159 reviews
Porter Airlines
8.0
Very good
389 reviews
Check prices

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Kelly,Nov 2025

YVR - YUL

I recently flew with Porter Airlines on Flight PD372 on October 30th, and unfortunately, had a very disappointing experience. At the gate, one of their attendants gave me two boarding passes. I assumed these were for my itinerary from Vancouver to Montreal and back, but one of the boarding passes unexpectedly included a connecting flight to Toronto, which was never part of my booking or invoice. As a result of this error, my checked baggage was mistakenly routed to Toronto. When I contacted Porter’s customer service, I spoke to an agent who apologized on behalf of the attendant (employee number 13209961) and promised to have my luggage flown back to Montreal. However, shortly after, I was told there was nothing they could do except for me to travel to Toronto myself to pick up my bag. This is highly unreasonable and unfair, considering the issue was caused by their staff printing the wrong boarding pass. This entire situation caused me significant inconvenience and stress. I expected Porter to correct the mistake and deliver my luggage as originally planned, but instead, I was left with the burden of fixing an error that was not mine. I even have a photo of the staff badge of the employee who made the promise, yet the company still failed to honor it. I hope Porter Airlines reviews their internal communication and baggage handling procedures to prevent this from happening to other passengers. Customer care and responsibility fell short in this experience, and I am still waiting for a satisfactory resolution.
Air Canada
7.1
Good
10,444 reviews
Porter Airlines
8.0
Very good
389 reviews
Check prices

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Kelly,Nov 2025

YVR - YUL

I recently flew with Porter Airlines on Flight PD372 on October 30th, and unfortunately, had a very disappointing experience. At the gate, one of their attendants gave me two boarding passes. I assumed these were for my itinerary from Vancouver to Montreal and back, but one of the boarding passes unexpectedly included a connecting flight to Toronto, which was never part of my booking or invoice. As a result of this error, my checked baggage was mistakenly routed to Toronto. When I contacted Porter’s customer service, I spoke to an agent who apologized on behalf of the attendant (employee number 13209961) and promised to have my luggage flown back to Montreal. However, shortly after, I was told there was nothing they could do except for me to travel to Toronto myself to pick up my bag. This is highly unreasonable and unfair, considering the issue was caused by their staff printing the wrong boarding pass. This entire situation caused me significant inconvenience and stress. I expected Porter to correct the mistake and deliver my luggage as originally planned, but instead, I was left with the burden of fixing an error that was not mine. I even have a photo of the staff badge of the employee who made the promise, yet the company still failed to honor it. I hope Porter Airlines reviews their internal communication and baggage handling procedures to prevent this from happening to other passengers. Customer care and responsibility fell short in this experience, and I am still waiting for a satisfactory resolution.

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 6h 55m. Delta provides one of the quickest options available for as low as C$ 492. 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 (100%), Qatar Airways (100%), Air Canada Rouge (93%).

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

    While on average a flight from Montreal to Key Largo is generally C$ 627, our data shows the cheapest flight currently is C$ 279. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - Miami), you can expect to pay C$ 429 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, March 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$ 200). 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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See prices for flight routes from nearby airports that may be better suited for you.
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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 13 November 2025.
AirlineCheapestAverageFlexibilityOn-time
Flair AirlinesCheapestC$ 116AverageC$ 291FlexibilityNo cancel feeOn-timeN/A
Search Flair Airlines flights
American AirlinesCheapestC$ 152AverageC$ 388FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 152AverageC$ 429FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 171AverageC$ 376FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 178AverageC$ 458FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Air TransatCheapestC$ 197AverageC$ 395FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
WestJetCheapestC$ 230AverageC$ 563FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 236AverageC$ 431FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

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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.

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

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