HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Niagara Falls

$125+ Cheap flights from Key Largo, FL to Niagara Falls, ON, 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — YYZ
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Key Largo to Niagara Falls with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Key Largo to Niagara Falls are usually found in March or January, booked 86 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap 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 December 18, 2025.

This Flightnetwork deal was found by Cheapflights users on 12/16. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:05 pmMIA - YYZ
Nonstop3h 21mMultiple Airlines
Thu 1/159:40 amYYZ - MIA
Nonstop3h 29mMultiple Airlines
Deal found 12/16$268
This FlightHub deal was found by Cheapflights users on 12/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/172:10 pmMIA - YYZ
Nonstop3h 20mPorter Airlines
Wed 1/79:40 amYYZ - MIA
Nonstop3h 29mPorter Airlines
Deal found 12/15$310
This Air Canada deal was found by Cheapflights users on 12/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/179:05 pmMIA - YYZ
Nonstop3h 21mAir Canada
Wed 1/74:00 pmYYZ - MIA
1 stop6h 29mAir Canada
Deal found 12/15$320
This Flightnetwork deal was found by Cheapflights users on 12/17. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/239:05 pmMIA - YYZ
Nonstop3h 21mAir Canada
Tue 12/304:50 pmYYZ - MIA
Nonstop3h 26mAir Canada
Deal found 12/17$327
This FlightHub deal was found by Cheapflights users on 12/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:10 pmMIA - YYZ
Nonstop3h 20mMultiple Airlines
Wed 12/319:40 amYYZ - MIA
Nonstop3h 29mMultiple Airlines
Deal found 12/16$337
This FlightHub deal was found by Cheapflights users on 12/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/232:10 pmMIA - YYZ
Nonstop3h 20mPorter Airlines
Wed 12/319:40 amYYZ - MIA
Nonstop3h 29mPorter Airlines
Deal found 12/16$343
This FlightHub deal was found by Cheapflights users on 12/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:10 pmMIA - YYZ
Nonstop3h 20mPorter Airlines
Wed 12/319:40 amYYZ - MIA
Nonstop3h 29mPorter Airlines
Deal found 12/16$345
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
Wed 12/172:10 pmMIA - YYZ
Nonstop3h 20mMultiple Airlines
Wed 1/75:15 pmYYZ - MIA
2 stops26h 31mMultiple Airlines
Deal found 12/15$356

Find 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 December 18, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$238
(Kiwi.com)

One-way from

$125
(Trip.com)

Popular in

October

Cheapest in

March

Average price

$285
Provider with most accurate pricing for Miami-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Toronto (YTO) flights.
Search Deals
From Key Largo to Niagara Falls
Search Deals
One-way flight from Key Largo to Niagara Falls
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Fri 1/16

10:06 am-10:12 pm

2 stops12h 06m

Toronto Pearson Intl

Fri 1/23

7:15 am-2:21 pm

1 stop7h 06m

$313

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 1/8

2:10 pm-5:30 pm

Nonstop3h 20m

Toronto Pearson Intl

Sun 1/11

9:40 am-1:09 pm

Nonstop3h 29m

$327

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 1/8

2:10 pm-5:30 pm

Nonstop3h 20m

Toronto Pearson Intl

Mon 1/12

9:40 am-1:09 pm

Nonstop3h 29m

$327

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Wed 1/7

1:59 pm-10:51 pm

1 stop8h 52m

Toronto Pearson Intl

Wed 1/14

6:06 am-2:35 pm

1 stop8h 29m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Mon 2/2

9:24 am-5:53 pm

1 stop8h 29m

Toronto Pearson Intl

Fri 2/6

6:14 pm-12:51 am

1 stop6h 37m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Sat 1/31

5:50 am-11:09 am

1 stop5h 19m

Toronto Pearson Intl

Fri 2/6

6:14 pm-12:51 am

1 stop6h 37m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Mon 2/2

11:33 am-5:53 pm

1 stop6h 20m

Toronto Pearson Intl

Sun 2/8

2:25 pm-9:10 pm

1 stop6h 45m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Thu 1/8

11:33 am-5:53 pm

1 stop6h 20m

Toronto Pearson Intl

Fri 1/9

6:14 pm-12:51 am

1 stop6h 37m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Mon 2/2

11:33 am-5:53 pm

1 stop6h 20m

Toronto Pearson Intl

Thu 2/5

2:25 pm-11:20 pm

1 stop8h 55m

$351

MiamiToronto

MIA - YYZ

MIAYYZ

Miami

Fri 1/23

6:25 pm-11:46 pm

1 stop5h 21m

Toronto Pearson Intl

Thu 1/29

10:00 am-4:22 pm

1 stop6h 22m

$352

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 21 results
1
2
3

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 December 12, 2025.

Booking 86 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, July is the cheapest month in which you can book a flight from Key Largo to Niagara Falls (average of $72). Flying from Key Largo to Niagara Falls in August is currently the most expensive (average of $107). 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 December 18, 2025.

A simple way to save on the total cost of your ticket is to fly from Key Largo to Niagara Falls in the evening. If you’re flexible enough to do this you can expect to save up to 44% on your trip compared to booking a flight in the afternoon.

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 Wednesday afternoons when fares are most often at their lowest. Monday at noon 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 December 18, 2025.

The most flights from KE9 to NI4 are scheduled on a Tuesday (10 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (5 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 December 18, 2025.
See what other customers who have flown with Porter Airlines, Delta, 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.
Porter Airlines
8.0
Very good
399 reviews

Entertainment

7.0

Food

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Porter Airlines
8.0
Very good
399 reviews
Porter Airlines
8.0
Very good
399 reviews

Entertainment

7.0

Food

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Delta
7.9
Good
8,005 reviews
Porter Airlines
8.0
Very good
399 reviews

Entertainment

7.0

Food

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
American Airlines
7.2
Good
11,055 reviews
Porter Airlines
8.0
Very good
399 reviews

Entertainment

7.0

Food

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Air Canada
7.1
Good
10,534 reviews
Porter Airlines
8.0
Very good
399 reviews

Entertainment

7.0

Food

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Flair Airlines
6.0
Okay
255 reviews
Porter Airlines
8.0
Very good
399 reviews

Entertainment

7.0

Food

7.6

Crew

8.6

Boarding

8.2

Overall

8.0

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out

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 $28 on Flair Airlines. Other airlines that offer cheap prices include WestJet from $80 and Porter Airlines from $89 one-way.

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

    Consider Envoy Air (100%), GOL (100%) or Air Canada Rouge (86%) 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 $430, our data indicates the cheapest price to be $138. The most popular route (Miami - Toronto Pearson Intl), is priced around $268.

  • 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, July is the cheapest month in which you can book a flight from Key Largo to Niagara Falls (average of $72). Flying from Key Largo to Niagara Falls in August is currently the most expensive (average of $107). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to Niagara Falls

See prices for flight routes from nearby airports that may be better suited for you.
Fort Lauderdale to Pierre Elliott Trudeau Intl flights
Fort Lauderdale to Pearson Intl flights
Tampa to Pearson Intl flights
Miami to Pierre Elliott Trudeau Intl flights
Miami to Pearson Intl flights
Orlando to Pearson Intl flights
Orlando to Pierre Elliott Trudeau Intl flights
Fort Lauderdale to Toronto Island flights
Tampa to Pierre Elliott Trudeau Intl flights
Fort Myers to Pearson Intl flights
Miami to Toronto Island flights
Orlando to Toronto Island flights
West Palm Beach to Pearson Intl flights
Tampa to Toronto Island flights
Fort Lauderdale to Hamilton flights
Orlando to Ottawa flights
West Palm Beach to Pierre Elliott Trudeau Intl flights
Fort Myers to Pierre Elliott Trudeau Intl flights
Jacksonville to Pearson Intl flights
Jacksonville to Pierre Elliott Trudeau Intl flights
Fort Lauderdale to Ottawa flights
Orlando to Hamilton flights
Sarasota to Pierre Elliott Trudeau Intl flights
Sarasota to Pearson Intl flights
Tampa to Ottawa flights
Fort Myers to Ottawa flights
Melbourne to Ottawa flights
Pensacola to Pearson Intl flights
West Palm Beach to Toronto Island flights
Miami to Ottawa flights
Daytona Beach to Pearson Intl flights
Panama City to Pearson Intl flights
Daytona Beach to Pierre Elliott Trudeau Intl flights
Jacksonville to Toronto Island flights
Jacksonville to Ottawa flights
Melbourne to Pierre Elliott Trudeau Intl flights
Melbourne to Pearson Intl flights
West Palm Beach to Ottawa flights
Orlando to Thunder Bay flights
Sarasota to Ottawa flights
Tallahassee to Pearson Intl flights
Pensacola to Pierre Elliott Trudeau Intl flights
Orlando to London flights
Panama City to Pierre Elliott Trudeau Intl flights
Pensacola to Ottawa flights
Tampa to Windsor flights
Tampa to London flights
Miami to Sudbury flights

Top 8 airlines flying from Key Largo to Niagara Falls

Discover the top 8 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Flair AirlinesCheapest$22Average$140FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$90Average$325FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$96Average$252FlexibilityNo cancel feeOn-time52%
WestJetCheapest$102Average$313FlexibilityNo cancel feeOn-time60%
DeltaCheapest$130Average$380FlexibilityNo cancel feeOn-timeN/A
Air TransatCheapest$135Average$304FlexibilityNo cancel feeOn-time50%
United AirlinesCheapest$180Average$321FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$243Average$392FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.