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Find cheap United Airlines flights to Seattle

RDU — SEA
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Find United Airlines flight deals to Seattle

Cheapest United Airlines flights from USA to Seattle
Explore the most affordable United Airlines flight options available from USA to Seattle. Find the lowest fares with prices last updated on July 27, 2026.

This United Airlines deal was found by Cheapflights users on 7/24. 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.
Fri 8/289:07 pm
SFO
-
SEA
Nonstop2h 19m
United Airlines
Tue 9/17:11 am
SEA
-
SFO
Nonstop2h 19m
United Airlines
Deal found 7/24$167
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Fri 8/289:07 pm
SFO
-
SEA
Nonstop2h 19m
United Airlines
Mon 8/319:05 am
SEA
-
SFO
Nonstop2h 19m
United Airlines
Deal found 7/22$172
This United Airlines deal was found by Cheapflights users on 7/27. 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 8/241:55 pm
SFO
-
SEA
Nonstop2h 19m
United Airlines
Mon 8/3110:55 am
SEA
-
SFO
Nonstop2h 20m
United Airlines
Deal found 7/27$180

Flights to Seattle with United Airlines at a glance

Find detailed information about United Airlines flights from USA to Seattle. Explore the options provided by United Airlines to plan your journey from USA to Seattle. Data last updated July 27, 2026.

Popular in

July

Cheapest in

January

Average price

$385

Round-trip from

$167

One-way from

$94

Good round-trip deal

$1,432 or less

Good one-way deal

$692 or less
Highest demand for flights to Seattle with United Airlines; 16% potential price increase.
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Best time to find cheap flights to Seattle with United Airlines; 2% potential price drop.
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Average price for flights to Seattle with United Airlines (round-trip).
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United Airlines
  • United Airlines
  • 9/27-10/3
  • Nonstop
  • 4h 38m total
  • USA to Seattle
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United Airlines
  • United Airlines
  • 8/28
  • Nonstop
  • 2h 19m total
  • USA to Seattle
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Price to beat on a round-trip flight from the United States to Seattle with United Airlines.
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Price to beat on a one-way flight from the United States to Seattle with United Airlines.
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Cheapflights Insights

Find cheap United Airlines flights to Seattle

How long is the flight to Seattle with United Airlines?

On average, United Airlines flights from the United States to Seattle take 4 hours 33 minutes. Flights to Seattle from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.

United Airlines weekly flight availability to Seattle

The most flights to Seattle operated by United Airlines are scheduled on a Sunday (43 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (28 on average).

When is the best time to book a flight to Seattle with United Airlines?

The best time to book a flight to Seattle with United Airlines is 27 days before departure. On average, fares are higher if you book 2 days before departure.

When is the cheapest time to fly to Seattle with United Airlines?

Users looking for the cheapest United Airlines fares to Seattle should consider flying on Wednesday evenings, when prices are typically cheapest. Budget-minded travellers will want to avoid Monday at noon, when prices are usually at their highest.

FAQs about flights to Seattle with United Airlines

  • Which airport do United Airlines flights arrive at when travelling to Seattle?

    United Airlines flights on this route tend to land at Seattle/Tacoma Intl Airport.

  • Is United Airlines the cheapest airline for a flight to Seattle?

    Flight prices will depend on many factors like date, time and cabin class so it is worth comparing flights before booking. Based on Cheapflights data the cheapest average return price for flights to Seattle tends to be with Spirit Airlines.

  • Are there alternative airlines other than United Airlines that fly to Seattle?

    Alaska Airlines, Delta and American Airlines all fly to Seattle and offer an alternative to United Airlines.

  • How much is a flight to Seattle with United Airlines?

    The average price for a return flight with United Airlines is $442; with a one-way flight around $296.

See more FAQs

Reviews of United Airlines

See what Cheapflights users have to say about their United Airlines experience.
United Airlines
7.4
Good
10,000 reviews
Overview

Food

6.6

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Popular United Airlines flights

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