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Find cheap Southwest flights to Seattle

RDU — SEA
aug. 26 — sep. 21
wo 8/26
wo 9/2
1 adult, Economy
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Find Southwest flight deals to Seattle

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

This Southwest deal was found by Cheapflights users on 7/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
di 8/254:45 pm
SFO
-
SEA
1 stop6h 40m
Southwest
di 9/291:45 pm
SEA
-
SFO
1 stop7h 55m
Southwest
Deal found 7/23$172
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 8/296:10 am
SFO
-
SEA
1 stop8h 10m
Southwest
za 9/59:15 am
SEA
-
SFO
1 stop10h 20m
Southwest
Deal found 7/27$177
This Southwest deal was found by Cheapflights users on 7/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
za 8/155:00 am
SFO
-
SEA
1 stop10h 55m
Southwest
do 12/176:45 am
SEA
-
SFO
1 stop4h 45m
Southwest
Deal found 7/25$178

Flights to Seattle with Southwest at a glance

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

Popular in

June

Cheapest in

October

Average price

$324

Round-trip from

$167

One-way from

$89

Good one-way deal

$228 or less
Highest demand for flights to Seattle with Southwest; 23% potential price increase.
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Best time to find cheap flights to Seattle with Southwest; 3% potential price drop.
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Average price for flights to Seattle with Southwest (round-trip).
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Southwest
  • Southwest
  • 9/9-9/15
  • 2 total stops
  • 14h 45m total
  • USA to Seattle
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Southwest
  • Southwest
  • 8/19
  • 1 total stop
  • 6h 50m total
  • USA to Seattle
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Price to beat on a one-way flight from the United States to Seattle with Southwest.
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Cheapflights Insights

Find cheap Southwest flights to Seattle

How long is the flight to Seattle with Southwest?

On average, Southwest 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.

Southwest weekly flight availability to Seattle

The most flights to Seattle operated by Southwest are scheduled on a Monday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (30 on average).

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

The best time to book a flight to Seattle with Southwest is 50 days before departure. On average, fares are higher if you book 1 day before departure.

When is the cheapest time to fly to Seattle with Southwest?

Users looking for the cheapest Southwest fares to Seattle should consider flying on Thursday at noon, when prices are typically cheapest. Budget-minded travellers will want to avoid Sunday afternoons, when prices are usually at their highest.

FAQs about flights to Seattle with Southwest

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

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

  • Is Southwest 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 Southwest that fly to Seattle?

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

  • How much is a flight to Seattle with Southwest?

    The average price for a return flight with Southwest is $426; with a one-way flight around $260.

See more FAQs

Reviews of Southwest

See what Cheapflights users have to say about their Southwest experience.
Southwest
8.0
Very good
4,229 reviews
Overview

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Popular Southwest flights

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