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$105+ Cheap flights from Key Largo, FL to Niagara Falls, Canada

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — YYZ
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Niagara Falls are usually found in December or March, booked 67 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap flight deals from Key Largo to Niagara Falls

Keep the following information in mind while searching for Key Largo to Niagara Falls flight deals. Data was last updated September 17, 2025.

Round-trip from

$238
(Kiwi.com)

One-way from

$105
(Kiwi.com)

Popular in

July

Cheapest in

December

Average price

$395
From Key Largo to Niagara Falls
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One-way flight from Key Largo to Niagara Falls
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Highest demand for flights based on searches. 15% potential increase in price ($60 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Key Largo to Niagara Falls

Cheapest flights from Key Largo to Niagara Falls
Explore the most affordable flight options available from Key Largo to Niagara Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:00 amMIA - YYZ
1 stop15h 07mMultiple Airlines
Sun 10/269:40 amYYZ - MIA
Nonstop3h 29mMultiple Airlines
Deal found 9/15$238
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:28 amMIA - YYZ
1 stop9h 39mMultiple Airlines
Sun 11/169:40 amYYZ - MIA
Nonstop3h 29mMultiple Airlines
Deal found 9/16$242
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:00 amMIA - YYZ
1 stop15h 07mMultiple Airlines
Fri 10/3112:50 pmYYZ - MIA
2 stops11h 44mMultiple Airlines
Deal found 9/16$260
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:28 amMIA - YYZ
1 stop9h 39mMultiple Airlines
Mon 11/177:15 amYYZ - MIA
2 stops17h 19mMultiple Airlines
Deal found 9/16$268
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/312:41 pmMIA - YYZ
1 stop8h 26mMultiple Airlines
Sun 10/54:00 pmYYZ - MIA
1 stop19h 45mMultiple Airlines
Deal found 9/16$272
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/106:00 amMIA - YYZ
1 stop15h 07mMultiple Airlines
Tue 10/142:50 pmYYZ - MIA
1 stop8h 20mMultiple Airlines
Deal found 9/15$273
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/262:10 pmMIA - YYZ
Nonstop3h 20mPorter Airlines
Sat 11/229:40 amYYZ - MIA
Nonstop3h 29mPorter Airlines
Deal found 9/15$274
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:52 pmMIA - YYZ
1 stop15h 43mMultiple Airlines
Sat 10/184:00 pmYYZ - MIA
1 stop17h 04mMultiple Airlines
Deal found 9/15$279
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:00 amMIA - YYZ
1 stop15h 07mMultiple Airlines
Sun 10/192:50 pmYYZ - MIA
1 stop8h 20mMultiple Airlines
Deal found 9/15$280
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/298:04 pmMIA - YYZ
2 stops18h 01mMultiple Airlines
Sat 10/254:00 pmYYZ - MIA
1 stop17h 04mMultiple Airlines
Deal found 9/15$283
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/312:41 pmMIA - YYZ
1 stop8h 26mMultiple Airlines
Tue 10/76:15 pmYYZ - MIA
1 stop28h 55mMultiple Airlines
Deal found 9/16$285

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Niagara Falls 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 2,558,603 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from Key Largo to Niagara Falls that are best for you.

Fly from

Key Largo

Fly to

Niagara Falls

Route

Depart

Return

Price

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 2/19

2:10 pm-5:30 pm

Nonstop3h 20m

Toronto Pearson Intl

Mon 2/23

9:40 am-1:09 pm

Nonstop3h 29m

$318

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 2/19

6:00 am-11:17 am

1 stop5h 17m

Toronto Pearson Intl

Mon 2/23

7:45 am-5:20 pm

1 stop9h 35m

$343

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Mon 11/24

7:45 am-1:43 pm

1 stop5h 58m

Toronto Pearson Intl

Wed 1/14

9:30 am-4:34 pm

1 stop7h 04m

$347

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 10/30

4:25 pm-7:45 pm

Nonstop3h 20m

Toronto Pearson Intl

Wed 11/5

8:00 am-11:26 am

Nonstop3h 26m

$347

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Fri 10/3

9:45 pm-1:01 am

Nonstop3h 16m

Toronto Pearson Intl

Mon 10/6

5:30 pm-8:48 pm

Nonstop3h 18m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 10/30

12:23 pm-7:45 pm

1 stop7h 22m

Toronto Pearson Intl

Wed 11/5

2:57 pm-11:04 pm

1 stop8h 07m

$352

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Fri 11/21

8:05 am-2:48 pm

1 stop6h 43m

Toronto Pearson Intl

Sun 11/23

6:05 am-2:20 pm

1 stop8h 15m

$354

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Mon 10/27

7:00 am-1:43 pm

1 stop6h 43m

Toronto Pearson Intl

Mon 11/3

11:00 am-6:17 pm

1 stop7h 17m

$354

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Sat 11/22

6:45 am-9:21 pm

1 stop14h 36m

Toronto Pearson Intl

Thu 11/27

6:10 am-7:52 pm

1 stop13h 42m

$354

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Sun 11/23

7:00 am-4:02 pm

1 stop9h 02m

Toronto Pearson Intl

Fri 11/28

6:10 am-10:00 pm

1 stop15h 50m

$354

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 23 results
1
2
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Best time to book a flight from Key Largo to Niagara Falls

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

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

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

Booking 67 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to Niagara Falls. 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 Key Largo to Niagara Falls?

Currently, January is the cheapest month in which you can book a flight from Key Largo to Niagara Falls (average of $243). Flying from Key Largo to Niagara Falls in August is currently the most expensive (average of $348). 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 KE9 to NI4?

Find hourly flight availability from Key Largo to Niagara Falls. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

When flying from Key Largo to Niagara Falls, 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 Key Largo to Niagara Falls?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Niagara Falls. Price data was last updated on December 16, 2024.

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

Weekly flight availability from Key Largo to Niagara Falls

Explore weekly flight availability from Key Largo to Niagara Falls. 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 September 17, 2025.

The most flights from KE9 to NI4 are scheduled on a Wednesday (4 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).

Reviews of airlines servicing Niagara Falls

Get insights into the airlines that provide service to Niagara Falls. 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 Niagara Falls. Reviews last updated September 17, 2025.
See what other customers who have flown with Delta, Porter Airlines, and American Airlines from Key Largo to Niagara Falls have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Porter Airlines
7.9
Good
365 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Flair Airlines
6.0
Okay
249 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Niagara Falls. 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 Key Largo to Niagara Falls?

    Departing from Key Largo to Niagara Falls will take you 3h 20m. Key Largo and Niagara Falls are separated by a distance of 1235 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    One-way options have recently been found by users for as low as $134 on Porter Airlines. Other airlines that offer cheap prices include Air Canada from $139 and United Airlines from $143 one-way.

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

    Consider Air Canada Rouge (87%), Brussels Airlines (79%) or British Airways (78%) when booking your flight. These represent the most reliable airlines when flying from Key Largo to Niagara Falls.

  • What are the cheapest flights from Key Largo to Niagara Falls?

    Looking for the cheapest flight from Key Largo to Niagara Falls? While on average our users pay $424, our data indicates the cheapest price to be $107. The most popular route (Miami - Toronto Pearson Intl), is priced around $242.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Key Largo to Niagara Falls 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 Key Largo to Niagara Falls?

    Currently, January is the cheapest month in which you can book a flight from Key Largo to Niagara Falls (average of $243). Flying from Key Largo to Niagara Falls in August is currently the most expensive (average of $348). 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.

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Top 7 airlines flying from Key Largo to Niagara Falls

Discover the top 7 airlines that operate flights from Key Largo to Niagara Falls. 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 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Flair AirlinesCheapest$22Average$140FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$79Average$287FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$89Average$242FlexibilityNo cancel feeOn-time52%
WestJetCheapest$100Average$308FlexibilityNo cancel feeOn-time60%
DeltaCheapest$129Average$378FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$132Average$288FlexibilityNo cancel feeOn-time50%
American AirlinesCheapest$220Average$391FlexibilityNo cancel feeOn-time71%

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