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Cheap flights from Niagara Falls, ON to Seattle from C$ 178

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
28 Feb — 7 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Niagara Falls to Seattle/Tacoma Intl are usually found in February or March, booked 86 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Niagara Falls to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Niagara Falls to Seattle
Explore the most affordable flight options available from Niagara Falls to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 January 2026.

Sat 7/34:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Sat 14/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 26/1C$ 284
Sat 28/24:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Sat 7/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 28/1C$ 291
Wed 25/24:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Wed 4/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 28/1C$ 300
Fri 8/51:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Sat 16/57:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 28/1C$ 304
Mon 9/37:45 a.m.
YYZ
-
SEA
1 stop9h 34m
WestJet
Mon 16/33:10 p.m.
SEA
-
YYZ
2 stops11h 48m
WestJet
Deal found 28/1C$ 305
Tue 17/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Wed 18/25:50 a.m.
SEA
-
YYZ
1 stop7h 19m
Air Canada
Deal found 27/1C$ 307
Thu 4/61:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Mon 8/67:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 27/1C$ 308
Fri 8/51:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Fri 15/510:30 a.m.
SEA
-
YYZ
2 stops10h 29m
WestJet
Deal found 27/1C$ 310
Thu 19/24:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Sat 21/27:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 27/1C$ 311
Tue 14/44:55 p.m.
YYZ
-
SEA
Nonstop5h 30m
Alaska Airlines
Mon 20/48:05 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 28/1C$ 312
Tue 14/47:30 p.m.
YYZ
-
SEA
Nonstop5h 21m
Air Canada
Sat 18/43:40 p.m.
SEA
-
YYZ
2 stops10h 54m
Air Canada
Deal found 28/1C$ 314
Fri 8/51:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Sun 10/57:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 27/1C$ 316

Find flight deals from Niagara Falls to Seattle

Keep the following information in mind while searching for Niagara Falls to Seattle flight deals. Data was last updated 29 January 2026.

Round-trip from

C$ 284

One-way from

C$ 178

Popular in

July

Cheapest in

February

Average price

C$ 411
Alaska Airlines
  • Alaska Airlines
  • 7/3-14/3
  • Nonstop
  • 10h 13m total
  • Niagara Falls to Seattle
Search Deals
WestJet
  • WestJet
  • 9/3
  • 1 total stop
  • 9h 34m total
  • Niagara Falls to Seattle
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (C$ 128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Niagara Falls to Seattle 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 29 January 2026.
Use the filters below to find and compare flights from Niagara Falls to Seattle that are best for you.

Fly from

Niagara Falls

Fly to

Seattle

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 4/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Wed 18/3

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 300

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 8/5

1:30 p.m.-6:45 p.m.

1 stop8h 15m

Seattle/Tacoma Intl

Sat 16/5

7:35 p.m.-5:45 a.m.

1 stop7h 10m

C$ 304

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 7/5

4:55 p.m.-7:23 p.m.

Nonstop5h 28m

Seattle/Tacoma Intl

Wed 13/5

7:59 a.m.-3:45 p.m.

Nonstop4h 46m

C$ 311

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 2/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Wed 4/3

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 312

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Sun 15/3

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 312

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 26/2

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Thu 5/3

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 323

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 7/5

4:55 p.m.-7:23 p.m.

Nonstop5h 28m

Seattle/Tacoma Intl

Thu 14/5

7:59 a.m.-3:45 p.m.

Nonstop4h 46m

C$ 323

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 6/5

10:45 a.m.-6:00 p.m.

1 stop10h 15m

Seattle/Tacoma Intl

Wed 13/5

7:00 a.m.-7:37 p.m.

1 stop9h 37m

C$ 334

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/3

7:45 a.m.-2:19 p.m.

1 stop9h 34m

Seattle/Tacoma Intl

Sun 15/3

9:35 p.m.-6:43 a.m.

1 stop30h 08m

C$ 337

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 18/3

6:30 a.m.-4:14 p.m.

1 stop12h 44m

Seattle/Tacoma Intl

Wed 25/3

7:10 p.m.-3:02 p.m.

1 stop16h 52m

C$ 345

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/1

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from Niagara Falls to Seattle. Price data was last updated on 23 January 2026.

The best time to book flights from Niagara Falls to Seattle is 86 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 Niagara Falls to Seattle?

Currently, December is the cheapest month in which you can book a flight from Niagara Falls to Seattle (average of C$ 178). Flying from Niagara Falls to Seattle in July is currently the most expensive (average of C$ 320). 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 NI4 to SEA?

Find hourly flight availability from Niagara Falls to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 January 2026.

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

Weekly flight availability from Niagara Falls to Seattle

Explore weekly flight availability from Niagara Falls to Seattle. 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 29 January 2026.

The most flights from NI4 to SEA are scheduled on a Monday (9 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

How much does it cost to fly round-trip from Niagara Falls to Seattle?

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 29 January 2026.
See what other customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Niagara Falls to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,808 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,127 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,215 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
WestJet
7.2
Good
3,253 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Air Canada
7.1
Good
10,667 reviews
Alaska Airlines
8.0
Very good
11,808 reviews
Check prices

Overall

8.0

Crew

8.5

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

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

    Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly into when you book flights from Niagara Falls to Seattle. 6 airlines have flights to Seattle/Tacoma Intl from Niagara Falls on a regular basis. Booking flights from Niagara Falls to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 6 inbound flights from Niagara Falls per day.

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

    Alaska Airlines and WestJet can get you from Niagara Falls to Seattle in just under 5h 33m. Your travel time can differ by up to 2h 42m. There are 3306 km between Niagara Falls and Seattle. Both multi-stop and direct flights can be found to your destination and back.

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

    The cheapest airlines for a one-way flight from Niagara Falls to Seattle are Alaska Airlines (C$ 169), WestJet (C$ 175), and Delta (C$ 221).

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

    Before booking your flight to Seattle from Niagara Falls, check out the most reliable airlines to get you to your destination on time: Qatar Airways (79%), Alaska Airlines (59%), Hawaiian Airlines( 59%).

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

    While on average a flight from Niagara Falls to Seattle is generally C$ 800, our data shows the cheapest flight currently is C$ 160. When looking at the most popular route, (Toronto Pearson Intl - Seattle/Tacoma Intl), you can expect to pay C$ 303 for that flight.

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

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

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

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

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

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

    Currently, December is the cheapest month in which you can book a flight from Niagara Falls to Seattle (average of C$ 178). Flying from Niagara Falls to Seattle in July is currently the most expensive (average of C$ 320). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
SeaTac
Mukilteo
Tacoma
Kent
Tukwila
Bothell
Cashmere
Olympia
Renton
Lynnwood
Marysville
Kirkland

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Niagara Falls to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Kingston to Seattle flights

Top 6 airlines flying from Niagara Falls to Seattle

Discover the top 6 airlines that operate flights from Niagara Falls to Seattle. 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 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 125AverageC$ 348FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 249AverageC$ 482FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 269AverageC$ 462FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 322AverageC$ 582FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 340AverageC$ 611FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Hawaiian AirlinesCheapestC$ 404AverageC$ 456FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Niagara Falls to Seattle?

When you search for this flight from Niagara Falls to Seattle, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Niagara Falls to Seattle?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Niagara Falls to Seattle.

Can Cheapflights find flights from Niagara Falls to Seattle with no change fees?

Certainly. Search results for flights to Seattle from Niagara Falls shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Niagara Falls to Seattle become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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