Cheap Flights from Boulder (WBU) to Seattle (SEA)

Popular airlines from Boulder, CO (WBU-Boulder Municipal) to Seattle-Tacoma International Airport (SEA)

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Frequently asked questions

How much does a flight from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA) cost?
Snag a cheap one-way flight or cheap return flight from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from WBU to SEA is , when demand is low. Off-peak season is generally when you'll find cheap fares for travel between these airports.
Which airlines fly direct from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA)?
You can't fly direct from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA). However, you can easily journey to Seattle without any layovers by taking off from Denver Intl. Airport (DEN).
What is the cheapest airline that flies from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline flying from WBU to SEA, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA)?
You'll have to book a flight with a layover when traveling from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA). There are no daily direct flights on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from WBU to SEA?
Usually you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can vary based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA)?
To avoid possible delays on the Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA) route, fly before 3 PM. Departures after this hour are 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 Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Waiting until just before your trip to book a ticket from WBU to SEA generally means paying more. While you may find some last-minute deals, there's no guarantee. Keep your travel plans flexible for a better chance of scoring a bargain.
Is it cheaper to book a WBU to SEA flight and hotel package?
You'll generally save money by booking a WBU to SEA flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. After choosing your preferred flights and accommodations, consider adding extras including activities, car rentals and tours.
Can I cancel or change the date of my flight from Boulder, CO (WBU-Boulder Municipal) to Seattle - Tacoma Intl. Airport (SEA)?
In most cases, you're able to cancel or reschedule your WBU to SEA flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you want more information, go to our Customer Service portal.

Travel information

Origin airport
Boulder Municipal
Destination airport
Seattle - Tacoma Intl.
Distance
990 mi

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Boulder to Seattle Flights

The cheapest times to fly from Boulder 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 Boulder to Seattle are during the month of . You can find some of the cheapest flights from Boulder to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boulder to Seattle

Sunday is one of the best days to book for cheap flights from Boulder 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 Boulder 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 Boulder to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Boulder 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 Boulder 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.

 

Boulder to Seattle Flights

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