HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Niagara Falls

$78+ Cheap flights from Seattle (SEA) 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 5/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
Jan 2 — Jan 91
Fri 1/2
Fri 1/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle 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 Seattle/Tacoma Intl to Niagara Falls are usually found in January or February, booked 82 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from Seattle to Niagara Falls

Cheapest flights from Seattle to Niagara Falls
Explore the most affordable flight options available from Seattle to Niagara Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 3, 2025.

This United Airlines deal was found by Cheapflights users on 12/2. 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.
Tue 12/3011:15 pmSEA - YYZ
1 stop11h 59mUnited Airlines
Tue 1/69:00 pmYYZ - SEA
1 stop17h 32mUnited Airlines
Deal found 12/2$263
This United Airlines deal was found by Cheapflights users on 11/30. 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.
Tue 12/165:00 amSEA - YYZ
1 stop7h 02mUnited Airlines
Wed 12/176:30 amYYZ - SEA
1 stop17h 30mUnited Airlines
Deal found 11/30$265
This Kiwi.com deal was found by Cheapflights users on 12/1. 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.
Thu 12/113:10 pmSEA - YYZ
2 stops12h 48mMultiple Airlines
Sun 12/144:45 pmYYZ - SEA
Nonstop5h 33mMultiple Airlines
Deal found 12/1$271
This United Airlines deal was found by Cheapflights users on 11/30. 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.
Mon 12/1510:40 amSEA - YYZ
1 stop7h 41mUnited Airlines
Fri 12/263:45 pmYYZ - SEA
1 stop11h 49mUnited Airlines
Deal found 11/30$272
This Air Canada deal was found by Cheapflights users on 12/2. 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 12/318:10 amSEA - YYZ
Nonstop4h 43mAir Canada
Sat 1/107:00 pmYYZ - SEA
1 stop17h 31mAir Canada
Deal found 12/2$274
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 12/243:10 pmSEA - YYZ
1 stop18h 18mWestJet
Sat 1/1010:15 pmYYZ - SEA
2 stops15h 07mWestJet
Deal found 12/1$276
This Alaska Airlines deal was found by Cheapflights users on 12/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:00 amSEA - YYZ
Nonstop4h 35mAlaska Airlines
Wed 1/74:45 pmYYZ - SEA
Nonstop5h 32mAlaska Airlines
Deal found 12/2$283
This United Airlines deal was found by Cheapflights users on 12/3. 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 12/317:12 pmSEA - YYZ
1 stop9h 18mUnited Airlines
Wed 1/79:00 amYYZ - SEA
1 stop12h 14mUnited Airlines
Deal found 12/3$288
This Air Canada deal was found by Cheapflights users on 12/2. 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 12/308:10 amSEA - YYZ
Nonstop4h 43mAir Canada
Sat 1/107:00 pmYYZ - SEA
1 stop17h 31mAir Canada
Deal found 12/2$301
This Kiwi.com deal was found by Cheapflights users on 12/1. 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 12/243:10 pmSEA - YYZ
1 stop18h 18mMultiple Airlines
Sat 1/106:30 amYYZ - SEA
1 stop15h 19mMultiple Airlines
Deal found 12/1$302

Find flight deals from Seattle to Niagara Falls

Keep the following information in mind while searching for Seattle to Niagara Falls flight deals. Data was last updated December 3, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$252
(Air Canada)

One-way from

$78
(Kiwi.com)

Popular in

November

Cheapest in

January

Average price

$520
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto (YTO) flights.
Search Deals
From Seattle/Tacoma Intl to Niagara Falls
Search Deals
One-way flight from Seattle/Tacoma Intl to Niagara Falls
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 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 Seattle 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 3, 2025.
Use the filters below to find and compare flights from Seattle to Niagara Falls that are best for you.

Fly from

Seattle

Fly to

Niagara Falls

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 1/24

7:00 am-9:21 pm

1 stop11h 21m

Toronto Pearson Intl

Sat 1/31

10:45 am-9:12 pm

2 stops13h 27m

$260

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 3/6

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Mon 3/9

4:45 pm-7:18 pm

Nonstop5h 33m

$263

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 12/30

11:15 pm-2:14 pm

1 stop11h 59m

Toronto Pearson Intl

Tue 1/6

9:00 pm-11:32 am

1 stop17h 32m

$263

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 1/8

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Mon 1/12

4:45 pm-7:17 pm

Nonstop5h 32m

$268

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 5/25

7:05 am-9:00 pm

2 stops10h 55m

Toronto Pearson Intl

Sun 5/31

6:45 am-12:30 pm

1 stop8h 45m

$269

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 3/8

7:00 am-7:45 pm

1 stop9h 45m

Toronto Pearson Intl

Sun 3/15

11:00 am-7:03 pm

1 stop11h 03m

$272

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 3/5

7:00 am-9:21 pm

1 stop11h 21m

Toronto Pearson Intl

Mon 3/9

3:30 pm-10:45 pm

1 stop10h 15m

$272

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 5/25

7:05 am-6:52 pm

1 stop8h 47m

Toronto Pearson Intl

Tue 6/2

6:30 am-1:08 pm

1 stop9h 38m

$274

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 1/16

7:00 am-7:45 pm

1 stop9h 45m

Toronto Pearson Intl

Sun 1/18

2:45 pm-10:43 pm

2 stops10h 58m

$277

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 5/25

7:05 am-6:52 pm

1 stop8h 47m

Toronto Pearson Intl

Sat 5/30

6:45 am-1:08 pm

2 stops9h 23m

$281

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 22 results
1
2
3

Best time to book a flight from Seattle to Niagara Falls

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

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Niagara Falls. Price data was last updated on November 28, 2025.

The best time to book flights from Seattle to Niagara Falls is 82 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Niagara Falls?

Currently, March is the cheapest month in which you can book a flight from Seattle to Niagara Falls (average of $121). Flying from Seattle to Niagara Falls in May is currently the most expensive (average of $271). 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 SEA to NI4?

Find hourly flight availability from Seattle 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 3, 2025.

It’s typically best to fly out from Seattle to Niagara Falls in the afternoon. Doing so could potentially save you 62% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from Seattle to Niagara Falls?

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

Travelers seeking maximum savings on their Seattle to Niagara Falls flight should consider departing on Wednesday evenings 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 Seattle to Niagara Falls

Explore weekly flight availability from Seattle 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 3, 2025.

The most flights from SEA to NI4 are scheduled on a Tuesday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 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 3, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and United Airlines from Seattle to Niagara Falls 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.
Alaska Airlines
8.0
Very good
11,391 reviews

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,391 reviews
Alaska Airlines
8.0
Very good
11,391 reviews

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,391 reviews

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
9,064 reviews
Alaska Airlines
8.0
Very good
11,391 reviews

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
WestJet
7.2
Good
3,190 reviews
Alaska Airlines
8.0
Very good
11,391 reviews

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,497 reviews
Alaska Airlines
8.0
Very good
11,391 reviews

Boarding

8.1

Food

7.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

Related info for your journey

Find useful and relevant information for your journey from Seattle 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 Seattle to Niagara Falls?

    If you book a flight to Niagara Falls from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 3 flights from Seattle/Tacoma Intl to Niagara Falls per day from 5 different airlines.

  • How long is the flight from Seattle to Niagara Falls?

    United Airlines and Alaska Airlines can get you from Seattle to Niagara Falls in just under 4h 40m. Your travel time can differ by up to 6h 41m. Airlines will cover a distance of 2054 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    $83 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Alaska Airlines and United Airlines, with prices starting from $100 and $115, respectively.

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

    Consider Alaska Airlines (96%), Qatar Airways (96%) or Hawaiian Airlines (94%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Niagara Falls.

  • What are the cheapest flights from Seattle to Niagara Falls?

    While on average a flight from Seattle to Niagara Falls is generally $1,075, our data shows the cheapest flight currently is $111. When looking at the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl), you can expect to pay $190 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle 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 Seattle to Niagara Falls?

    Currently, March is the cheapest month in which you can book a flight from Seattle to Niagara Falls (average of $121). Flying from Seattle to Niagara Falls in May is currently the most expensive (average of $271). 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 Seattle to Niagara Falls

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Pearson Intl flights
Seattle to Pierre Elliott Trudeau Intl flights
Seattle to Toronto Island flights
Portland to Pearson Intl flights
Seattle to Hamilton flights
Seattle to Region of Waterloo Intl flights
Portland to Pierre Elliott Trudeau Intl flights
Portland to Toronto Island flights
Seattle to Ottawa flights
Spokane to Pearson Intl flights
Pasco to Pierre Elliott Trudeau Intl flights
Portland to Ottawa flights
Seattle to London flights
Pasco to Pearson Intl flights
Seattle to Thunder Bay flights
Bellingham to Pearson Intl flights
Bellingham to Pierre Elliott Trudeau Intl flights
Seattle to Timmins flights
Bellingham to Ottawa flights
Walla Walla to Pierre Elliott Trudeau Intl flights
Spokane to Hamilton flights

Top 5 airlines flying from Seattle to Niagara Falls

Discover the top 5 airlines that operate flights from Seattle 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 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$151Average$432FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$173Average$380FlexibilityNo cancel feeOn-time69%
DeltaCheapest$182Average$424FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$226Average$300FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$255Average$475FlexibilityNo cancel feeOn-time75%

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.