HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Niagara Falls

$139+ Cheap flights from St. Louis (STL) 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
Jan 9 — Jan 161
Fri 1/9
Fri 1/16
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis 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 Lambert-St Louis to Niagara Falls are usually found in May or July, booked 12 days in advance, depart on a Tuesday or Sunday and return on a Saturday

Cheap flight deals from St. Louis to Niagara Falls

Cheapest flights from St. Louis to Niagara Falls
Explore the most affordable flight options available from St. Louis to Niagara Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 10, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/7. 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.
Tue 12/2310:48 amSTL - YYZ
2 stops26h 52mMultiple Airlines
Wed 1/77:15 amYYZ - STL
1 stop16h 18mMultiple Airlines
Deal found 12/7$409
This Kiwi.com deal was found by Cheapflights users on 12/8. 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.
Sat 12/2010:10 pmSTL - YYZ
2 stops39h 10mMultiple Airlines
Fri 1/167:10 amYYZ - STL
1 stop16h 24mMultiple Airlines
Deal found 12/8$426
This American Airlines deal was found by Cheapflights users on 12/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/235:30 amSTL - YYZ
1 stop9h 00mAmerican Airlines
Wed 1/711:30 amYYZ - STL
1 stop7h 44mAmerican Airlines
Deal found 12/7$487
This United Airlines deal was found by Cheapflights users on 12/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:35 pmSTL - YYZ
1 stop4h 24mUnited Airlines
Fri 12/262:45 pmYYZ - STL
1 stop5h 37mUnited Airlines
Deal found 12/8$493
This American Airlines deal was found by Cheapflights users on 12/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/235:30 amSTL - YYZ
1 stop9h 00mAmerican Airlines
Thu 12/256:00 amYYZ - STL
1 stop14h 30mAmerican Airlines
Deal found 12/9$494
This American Airlines deal was found by Cheapflights users on 12/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:04 pmSTL - YYZ
1 stop20h 05mAmerican Airlines
Sun 12/2810:56 amYYZ - STL
1 stop11h 49mAmerican Airlines
Deal found 12/8$497
This United Airlines deal was found by Cheapflights users on 12/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:05 amSTL - YYZ
2 stops9h 52mUnited Airlines
Tue 12/305:30 pmYYZ - STL
1 stop5h 13mUnited Airlines
Deal found 12/9$503
This Kiwi.com deal was found by Cheapflights users on 12/9. 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 12/121:16 pmSTL - YYZ
2 stops21h 27mMultiple Airlines
Sun 12/148:00 pmYYZ - STL
1 stop27h 33mMultiple Airlines
Deal found 12/9$512
This Air Canada deal was found by Cheapflights users on 12/7. 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.
Tue 12/235:02 pmSTL - YYZ
1 stop5h 07mAir Canada
Wed 1/72:00 pmYYZ - STL
Nonstop2h 29mAir Canada
Deal found 12/7$553

Find flight deals from St. Louis to Niagara Falls

Keep the following information in mind while searching for St. Louis to Niagara Falls flight deals. Data was last updated December 10, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$283
(Kiwi.com)

One-way from

$139
(Kiwi.com)

Popular in

October

Cheapest in

May

Average price

$492
Provider with most accurate pricing for Lambert-St Louis-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Toronto (YTO) flights.
Search Deals
From Lambert-St Louis to Niagara Falls
Search Deals
One-way flight from Lambert-St Louis to Niagara Falls
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 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 St. Louis 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 10, 2025.
Use the filters below to find and compare flights from St. Louis to Niagara Falls that are best for you.

Fly from

St. Louis

Fly to

Niagara Falls

Route

Depart

Return

Price

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 1/18

10:09 pm-6:20 am

1 stop31h 11m

Toronto Pearson Intl

Wed 1/21

7:15 am-11:33 pm

1 stop17h 18m

$283

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 1/23

5:42 pm-2:20 pm

1 stop19h 38m

Toronto Pearson Intl

Fri 1/30

7:15 am-11:33 pm

2 stops17h 18m

$315

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 1/13

5:11 pm-12:11 am

1 stop30h 00m

Toronto Pearson Intl

Mon 1/26

7:10 am-11:33 pm

1 stop17h 23m

$339

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 2/14

6:35 pm-10:56 am

1 stop15h 21m

Toronto Pearson Intl

Sat 2/21

11:38 am-6:02 pm

1 stop7h 24m

$350

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 2/7

12:12 pm-11:35 am

2 stops22h 23m

Toronto Pearson Intl

Mon 2/9

5:15 pm-11:33 pm

1 stop7h 18m

$425

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 1/23

4:05 pm-7:06 pm

Nonstop2h 01m

Toronto Pearson Intl

Fri 1/30

2:50 pm-8:58 pm

1 stop7h 08m

$451

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sat 2/14

4:05 pm-7:06 pm

Nonstop2h 01m

Toronto Pearson Intl

Sat 2/21

2:00 pm-3:29 pm

Nonstop2h 29m

$468

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 1/26

4:05 pm-7:06 pm

Nonstop2h 01m

Toronto Pearson Intl

Thu 1/29

2:00 pm-3:29 pm

Nonstop2h 29m

$468

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 3/6

4:05 pm-7:06 pm

Nonstop2h 01m

Toronto Pearson Intl

Sun 3/8

2:00 pm-3:29 pm

Nonstop2h 29m

$469

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Fri 1/23

5:42 pm-2:20 pm

1 stop19h 38m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 14 results
1
2

Best time to book a flight from St. Louis to Niagara Falls

Have a flexible travel schedule? Discover the best time to fly to Niagara Falls from St. Louis 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 St. Louis to Niagara Falls

How far ahead should I book a flight from St. Louis to Niagara Falls?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Niagara Falls. Price data was last updated on December 5, 2025.

Booking 12 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis 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 St. Louis to Niagara Falls?

Currently, June is the cheapest month in which you can book a flight from St. Louis to Niagara Falls (average of $179). Flying from St. Louis to Niagara Falls in October is currently the most expensive (average of $516). 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 STL to NI4?

Find hourly flight availability from St. Louis 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 10, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Niagara Falls as you normally would.

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 10, 2025.
Read reviews from past customers who have flown United Airlines, American Airlines, and Air Canada from St. Louis to Niagara Falls. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
American Airlines
7.2
Good
11,047 reviews
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
Air Canada
7.1
Good
10,513 reviews
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Food

6.6

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Niagara Falls. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Niagara Falls?

    If you book a flight to Niagara Falls from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There is 1 flight from Lambert-St Louis to Niagara Falls per day from 3 different airlines.

  • How long is the flight from St. Louis to Niagara Falls?

    A quick flight from St. Louis to Niagara Falls can take about 15h 21m. American Airlines provides one of the quickest options available for as low as $350. St. Louis and Niagara Falls are separated by a distance of 653 mi.

  • What are the most reliable airlines from St. Louis to Niagara Falls?

    The top 3 most reliable airlines when flying from St. Louis to Niagara Falls are Air Canada (94%), Jazz (94%) and United Airlines (94%).

  • What are the cheapest flights from St. Louis to Niagara Falls?

    Looking at all options, your cheapest flight can be booked for $209. While the most popular route (Lambert-St Louis - Toronto Pearson Intl) can be booked for $283 on average, our data indicates $1,293 when flying from St. Louis to Niagara Falls.

  • Can I find deals for flights from St. Louis to Niagara Falls that include hotel bookings?

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

  • How can I find direct flights from St. Louis to Niagara Falls?

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

  • Can I find deals for business class flights from St. Louis to Niagara Falls?

    Yes. Cheapflights offers flight deals from St. Louis 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 St. Louis to Niagara Falls?

    Currently, June is the cheapest month in which you can book a flight from St. Louis to Niagara Falls (average of $179). Flying from St. Louis to Niagara Falls in October is currently the most expensive (average of $516). 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.

Top 3 airlines flying from St. Louis to Niagara Falls

Discover the top 3 airlines that operate flights from St. Louis 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 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$199Average$503FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$220Average$534FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$270Average$558FlexibilityNo 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.