How do most travelers feel about United Airlines?

Cheapflights users who travel with United Airlines (a popular airline from Toronto to Seattle) have rated them a 7.4/10. This rating comes from 9,066 reviews. If you are looking to travel YTO-SEA, search your dates above.

Can I get a flight from Toronto to Seattle on United Airlines for under C$ 698?

Cheapflights users have found 8 United Airlines flights for under C$ 698 on the YTO-SEA route. Prices on flights to Seattle from Toronto can vary based on many factors including dates. To look at price based on your preferred dates, click here.

C$ 205+ United Airlines Flights from Toronto to Seattle

Cheapflights users flying from Toronto to Seattle on United Airlines typically fly into Seattle/Tacoma Intl and depart from Toronto Pearson Intl. Select your dates above for pricing.

United Airlines flights from Toronto to Seattle in 2025

One-way from	C$ 205
Round-trip from	C$ 299
Popular in	December
Cheapest in	February
Average price (all airlines)	C$ 635

United Airlines
9/1
1 total stop
19h 49m total
Toronto to Seattle

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United Airlines
10/1-17/1
2 total stops
21h 20m total
Toronto to Seattle

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Highest demand for flights from Toronto to Seattle/Tacoma Intl; 1% potential price increase.

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Best time to find cheap flights from Toronto to Seattle/Tacoma Intl; 2% potential price drop.

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Average price for all Toronto to Seattle/Tacoma Intl flights (one-way and round-trip).

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Can I get a flight from Toronto to Seattle on United Airlines for under C$ 698?
Cheapflights users have found 8 United Airlines flights for under C$ 698 on the YTO-SEA route. Prices on flights to Seattle from Toronto can vary based on many factors including dates. To look at price based on your preferred dates, click here.
How do most travelers feel about United Airlines?
Cheapflights users who travel with United Airlines (a popular airline from Toronto to Seattle) have rated them a 7.4/10. This rating comes from 9,066 reviews. If you are looking to travel YTO-SEA, search your dates above.

Find United Airlines flight deals from Toronto to Seattle

Enter your travel dates to find the best prices.

Cheapest United Airlines flights from Toronto to Seattle
Explore the most affordable United Airlines flight options available from Toronto to Seattle. Find the lowest fares with prices last updated on 4 December 2025.

Sat 10/110:00 a.m.YYZ - SEA

1 stop13h 57mUnited Airlines

Sat 17/110:58 a.m.SEA - YYZ

1 stop7h 23mUnited Airlines

Deal found 2/12C$ 299

Fri 16/12:45 p.m.YYZ - SEA

1 stop9h 12mUnited Airlines

Wed 21/111:45 p.m.SEA - YYZ

1 stop9h 03mUnited Airlines

Deal found 2/12C$ 310

Mon 12/12:57 p.m.YYZ - SEA

1 stop11h 18mUnited Airlines

Wed 14/111:45 p.m.SEA - YYZ

1 stop9h 03mUnited Airlines

Deal found 4/12C$ 322

Best United Airlines flights from Toronto to Seattle
Discover carefully curated United Airlines flight deals from Toronto to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 4 December 2025.

Wed 21/111:00 a.m.YYZ - SEA

1 stop10h 14mUnited Airlines

Wed 28/12:10 p.m.SEA - YYZ

1 stop6h 49mUnited Airlines

Deal found 4/12C$ 299

Mon 2/23:30 p.m.YYZ - SEA

1 stop10h 13mUnited Airlines

Sat 7/210:58 a.m.SEA - YYZ

1 stop10h 01mUnited Airlines

Deal found 3/12C$ 321

Mon 9/211:00 a.m.YYZ - SEA

1 stop14h 43mUnited Airlines

Thu 19/25:00 a.m.SEA - YYZ

1 stop7h 02mUnited Airlines

Deal found 4/12C$ 321

Direct United Airlines flights from Toronto to Seattle
Explore non-stop United Airlines flight options from Toronto to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 4 December 2025.

Sat 17/17:50 p.m.YYZ - SEA

Nonstop5h 26mUnited Airlines

Sat 24/18:10 a.m.SEA - YYZ

Nonstop4h 43mUnited Airlines

Deal found 2/12C$ 388

Thu 1/17:50 p.m.YYZ - SEA

Nonstop5h 26mUnited Airlines

Mon 5/18:10 a.m.SEA - YYZ

Nonstop4h 43mUnited Airlines

Deal found 3/12C$ 433

Wed 24/127:50 p.m.YYZ - SEA

Nonstop5h 26mUnited Airlines

Mon 29/128:10 a.m.SEA - YYZ

Nonstop4h 43mUnited Airlines

Deal found 2/12C$ 1,186

Last-minute United Airlines flights from Toronto to Seattle
Discover last-minute United Airlines flight deals from Toronto to Seattle. Data last updated 4 December 2025 and is based on user searches.

Sat 10/110:00 a.m.YYZ - SEA

1 stop13h 57mUnited Airlines

Sat 17/110:58 a.m.SEA - YYZ

1 stop7h 23mUnited Airlines

Deal found 2/12C$ 299

Fri 16/12:45 p.m.YYZ - SEA

1 stop9h 12mUnited Airlines

Wed 21/111:45 p.m.SEA - YYZ

1 stop9h 03mUnited Airlines

Deal found 2/12C$ 310

Mon 12/12:57 p.m.YYZ - SEA

1 stop11h 18mUnited Airlines

Wed 14/111:45 p.m.SEA - YYZ

1 stop9h 03mUnited Airlines

Deal found 4/12C$ 322

One-way United Airlines flights to Seattle
Search for one-way United Airlines flight options to Seattle. Find affordable one-way fares based on user searches. Data last updated 4 December 2025.

Fri 9/16:10 a.m.YYZ - SEA

1 stop19h 49mUnited Airlines

Deal found 3/12C$ 205

Mon 9/35:30 p.m.YYZ - SEA

2 stops19h 19mUnited Airlines

Deal found 4/12C$ 214

Fri 26/123:45 p.m.YYZ - SEA

1 stop11h 49mUnited Airlines

Deal found 4/12C$ 218

Travel insights for United Airlines flights from Toronto to Seattle

Get recent, data-driven insights about United Airlines flights from Toronto to Seattle including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Toronto to Seattle with United Airlines?

Currently, the most affordable month to book a United Airlines flight from Toronto to Seattle in December, with an average price of C$ 241. Conversely, traveling with United Airlines from Toronto to Seattle in September will be the most expensive, with an average cost of C$ 427. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Weekly United Airlines flight availability from Toronto to Seattle

The most United Airlines flights from YTO to SEA are scheduled on a Monday (2 on average). You will have fewer United Airlines flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Seattle by month

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Best time to book a flight from Toronto to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Toronto 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.

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See what others are saying about United Airlines

United Airlines

7.4

Good

9,066 reviews

Check prices

Overview

Recent reviews

10.0

Wonderful|Dec 2025

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

2.0

Poor|Oct 2025

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

8.0

Very good|Oct 2025

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

4.0

Mediocre|Sep 2025

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

10.0

Wonderful|Sep 2025

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.

1 out of 3022

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United Airlines flights from Toronto to Seattle (YTO - SEA)

Cheapflights users flying from Toronto to Seattle on United Airlines typically fly into Seattle/Tacoma Intl and depart from Toronto Pearson Intl. Select your dates above for pricing.

United Airlines flights from Toronto to Seattle in 2025

Find detailed information about United Airlines flights from Toronto to Seattle. Explore the options provided by United Airlines to plan your journey from Toronto to Seattle. Data last updated 4 December 2025.

One-way from

Round-trip from

Popular in

Cheapest in

Average price (all airlines)

Can I get a flight from Toronto to Seattle on United Airlines for under C$ 698?

How do most travelers feel about United Airlines?

Find United Airlines flight deals from Toronto to Seattle

Cheapest United Airlines flights from Toronto to SeattleExplore the most affordable United Airlines flight options available from Toronto to Seattle. Find the lowest fares with prices last updated on 4 December 2025.

Explore the most affordable United Airlines flight options available from Toronto to Seattle. Find the lowest fares with prices last updated on 4 December 2025.

Travel insights for United Airlines flights from Toronto to Seattle

Get recent, data-driven insights about United Airlines flights from Toronto to Seattle including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Toronto to Seattle with United Airlines?

Weekly United Airlines flight availability from Toronto to Seattle

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

Best time to book a flight from Toronto to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Toronto with our price prediction graph.

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.

Fly from Toronto to Seattle on another airline

Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on 4 December 2025.

See what others are saying about United Airlines

Overview

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Travel Smart

Cheapest United Airlines flights from Toronto to Seattle
Explore the most affordable United Airlines flight options available from Toronto to Seattle. Find the lowest fares with prices last updated on 4 December 2025.