$203 Cheap Flights from Williston (XWA) to Seattle (SEA)

View $203 flight on Fri, Sep 26, 2025Opens in a new window

Popular airlines from Williston, ND (XWA-Basin Intl.) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Williston to Seattle (XWA-SEA)

Prices were available within the past 7 days and start at $203 for one-way flights and $238 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Nov 3 - Wed, Dec 3
XWA
Williston
SEA
Seattle
$238 Roundtrip, found 1 day ago
$238
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 3 from Williston to Seattle, returning Wed, Dec 3, priced at $238 found 1 day ago
Delta
Fri, Sep 26 - Sun, Oct 12
XWA
Williston
SEA
Seattle
$244 Roundtrip, found 1 day ago
$244
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Sep 26 from Williston to Seattle, returning Sun, Oct 12, priced at $244 found 1 day ago
Delta
Sat, Aug 16 - Wed, Sep 3
XWA
Williston
SEA
Seattle
$249 Roundtrip, found 1 day ago
$249
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Aug 16 from Williston to Seattle, returning Wed, Sep 3, priced at $249 found 1 day ago
United
Mon, Nov 3 - Wed, Dec 3
XWA
Williston
SEA
Seattle
$263 Roundtrip, found 1 day ago
$263
Roundtrip
found 1 day ago
Select United flight, departing Mon, Nov 3 from Williston to Seattle, returning Wed, Dec 3, priced at $263 found 1 day ago
Delta
Sun, Sep 7 - Tue, Sep 23
XWA
Williston
SEA
Seattle
$268 Roundtrip, found 1 day ago
$268
Roundtrip
found 1 day ago
Select Delta flight, departing Sun, Sep 7 from Williston to Seattle, returning Tue, Sep 23, priced at $268 found 1 day ago
Delta
Fri, Aug 22 - Tue, Sep 9
XWA
Williston
SEA
Seattle
$274 Roundtrip, found 1 day ago
$274
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Aug 22 from Williston to Seattle, returning Tue, Sep 9, priced at $274 found 1 day ago
Delta
Wed, Sep 3 - Fri, Sep 19
XWA
Williston
SEA
Seattle
$279 Roundtrip, found 1 day ago
$279
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Sep 3 from Williston to Seattle, returning Fri, Sep 19, priced at $279 found 1 day ago
Delta
Sat, Aug 16 - Wed, Aug 20
XWA
Williston
SEA
Seattle
$284 Roundtrip, found 1 day ago
$284
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Aug 16 from Williston to Seattle, returning Wed, Aug 20, priced at $284 found 1 day ago
Delta
Tue, Aug 26 - Thu, Sep 11
XWA
Williston
SEA
Seattle
$298 Roundtrip, found 1 day ago
$298
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Aug 26 from Williston to Seattle, returning Thu, Sep 11, priced at $298 found 1 day ago
Delta
Fri, Sep 12 - Mon, Sep 29
XWA
Williston
SEA
Seattle
$303 Roundtrip, found 1 day ago
$303
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Sep 12 from Williston to Seattle, returning Mon, Sep 29, priced at $303 found 1 day ago

Find the cheapest month to fly from Williston (XWA) to Seattle (SEA)

October is typically the cheapest month to fly

From $238 - $834 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $704
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $704
Flights from Williston (XWA) to Seattle (SEA)
Origin airport
Basin Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Delta, United
Roundtrip price
$238
Distance
859 mi

Williston to Seattle Flights

The cheapest times to fly from Williston to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Williston to Seattle are during the month of November. You can find some of the cheapest flights from Williston to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Williston to Seattle

Sunday is one of the best days to book for cheap flights from Williston to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Williston to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Williston to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $203 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Williston to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Williston to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA) cost?
Discover the latest flight deals from XWA to SEA by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from XWA to SEA?
The cheapest flights from XWA to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from XWA to SEA?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from XWA to SEA. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA)?
Nonstop flights from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from XWA to SEA?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on various factors, including the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA)?
Choose a flight from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA) that takes off before 3 PM to reduce the risk of cancellations and delays. Departures after this hour are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until just before your trip to book a ticket from XWA to SEA often results in higher prices. While you might find some last-minute discounts, they're not always guaranteed. Be flexible with your travel plans to maximize your chances of scoring a bargain.
Is it cheaper to book a XWA to SEA flight and hotel package?
Compared with arranging hotels and flights separately, booking a XWA to SEA flight and hotel package with Expedia could result in significant savings. What's more, having everything in one easy place takes the hassle out of planning your trip. Just secure your flights and select from our extensive range of hotels, then tailor your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Basin Intl. Airport (XWA) to Seattle - Tacoma Intl. Airport (SEA)?
If you booked your XWA to SEA flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

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*Available to One Key members.