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Cheap flights from Niagara Falls, ON to Seattle from C$ 252

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
23 Jul — 30 Jul1
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 January, booked 86 days in advance, depart on a Thursday or Friday and return on a Thursday

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 23 June 2026.

Fri 20/116:30 a.m.
YYZ
-
SEA
1 stop9h 50m
WestJet
Mon 23/113:10 p.m.
SEA
-
YYZ
2 stops10h 48m
WestJet
Deal found 21/6C$ 421
Fri 11/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Mon 21/97:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Deal found 21/6C$ 429
Tue 8/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Tue 15/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 22/6C$ 431
Fri 25/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Sat 3/107:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 22/6C$ 432
Wed 9/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Thu 24/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 22/6C$ 434
Mon 14/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Wed 30/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 18/6C$ 436
Tue 15/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Wed 23/910:30 a.m.
SEA
-
YYZ
1 stop7h 45m
WestJet
Deal found 19/6C$ 438
Wed 30/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Mon 5/107:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 20/6C$ 439
Sun 6/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Tue 29/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 21/6C$ 446

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 23 June 2026.

Round-trip from

C$ 421

One-way from

C$ 252

Popular in

June

Cheapest in

February

Average price

C$ 639
WestJet
  • WestJet
  • 20/11-23/11
  • 3 total stops
  • 20h 38m total
  • Niagara Falls to Seattle
Search Deals
WestJet
  • WestJet
  • 1/10
  • 1 total stop
  • 9h 45m total
  • Niagara Falls to Seattle
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (C$ 154 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 23 June 2026.
Use the filters below to find and compare flights from Niagara Falls to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 16/9

11:00 a.m.-7:15 p.m.

1 stop11h 15m

Seattle/Tacoma Intl

Sat 3/10

5:00 a.m.-3:14 p.m.

1 stop7h 14m

C$ 538

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 16/9

8:50 a.m.-4:07 p.m.

1 stop10h 17m

Seattle/Tacoma Intl

Wed 30/9

8:10 a.m.-7:02 p.m.

1 stop7h 52m

C$ 538

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 28/8

10:15 a.m.-10:43 p.m.

1 stop15h 28m

Seattle/Tacoma Intl

Mon 14/9

7:00 a.m.-8:44 p.m.

1 stop10h 44m

C$ 546

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 28/8

7:00 a.m.-10:43 p.m.

1 stop18h 43m

Seattle/Tacoma Intl

Sun 13/9

11:59 p.m.-2:24 p.m.

1 stop11h 25m

C$ 546

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 18/8

11:00 a.m.-10:43 p.m.

1 stop14h 43m

Seattle/Tacoma Intl

Tue 1/9

5:13 p.m.-11:49 a.m.

1 stop15h 36m

C$ 554

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 14/9

2:30 p.m.-8:18 p.m.

1 stop8h 48m

Seattle/Tacoma Intl

Mon 14/9

11:00 p.m.-11:49 a.m.

1 stop9h 49m

C$ 588

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 19/8

4:18 p.m.-11:04 p.m.

1 stop9h 46m

Seattle/Tacoma Intl

Sun 30/8

5:15 p.m.-2:24 p.m.

1 stop18h 09m

C$ 656
Quickest round-trip

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 19/8

5:50 p.m.-10:05 p.m.

1 stop7h 15m

Seattle/Tacoma Intl

Tue 1/9

6:00 a.m.-5:19 p.m.

1 stop8h 19m

C$ 676

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 20/7

9:00 p.m.-9:40 a.m.

1 stop15h 40m

Seattle/Tacoma Intl

Mon 27/7

7:20 p.m.-1:55 p.m.

1 stop15h 35m

C$ 699

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sun 19/7

6:10 a.m.-10:42 p.m.

1 stop19h 32m

Seattle/Tacoma Intl

Mon 27/7

7:20 p.m.-1:30 p.m.

1 stop15h 10m

C$ 802

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/6

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

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 23 June 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 23 June 2026.

The most flights from NI4 to SEA are scheduled on a Tuesday (4 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (1 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 23 June 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
7.9
Good
12,564 reviews
Check prices

Entertainment

7.0

Crew

8.5

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,564 reviews
Alaska Airlines
7.9
Good
12,564 reviews
Check prices

Entertainment

7.0

Crew

8.5

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Delta
7.8
Good
8,424 reviews
Alaska Airlines
7.9
Good
12,564 reviews
Check prices

Entertainment

7.0

Crew

8.5

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
United Airlines
7.4
Good
9,878 reviews
Alaska Airlines
7.9
Good
12,564 reviews
Check prices

Entertainment

7.0

Crew

8.5

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
WestJet
7.2
Good
3,380 reviews
Alaska Airlines
7.9
Good
12,564 reviews
Check prices

Entertainment

7.0

Crew

8.5

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Air Canada
7.1
Good
11,244 reviews
Alaska Airlines
7.9
Good
12,564 reviews
Check prices

Entertainment

7.0

Crew

8.5

Food

7.0

Overall

7.9

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

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. 5 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 2 inbound flights from Niagara Falls per day.

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

    United Airlines can get you from Niagara Falls to Seattle in just under 11h 15m. Your travel time can differ by up to . There are 3306 km between Niagara Falls and Seattle.

  • 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$ 173), WestJet (C$ 183), and Air Canada (C$ 214).

  • 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: Hawaiian Airlines (100%), Alaska Airlines (95%), Qatar Airways( 67%).

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

    While on average a flight from Niagara Falls to Seattle is generally C$ 782, our data shows the cheapest flight currently is C$ 339. When looking at the most popular route, (Toronto Pearson Intl - Seattle/Tacoma Intl), you can expect to pay C$ 472 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.

See more FAQs

Travelling to a place near Seattle?

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

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Niagara Falls to Seattle

Discover the top 5 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 23 June 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 229AverageC$ 516FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 276AverageC$ 436FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 278AverageC$ 386FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 285AverageC$ 600FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 379AverageC$ 768FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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.

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