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

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

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Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal) cost?
Grab a cheap one-way flight or cheap return flight from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal)?
is the most affordable month to fly from SEA to WBU. Traveling during an off-peak travel window is often the key to landing a great deal.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll fly you from SEA to WBU. Then, sort your results by "Price (lowest to highest)" to score the best deal available.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal)?
There are no daily direct flights from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from SEA to WBU?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal)?
To avoid possible delays on the Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal) route, aim to travel before 3 PM. Later flights 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.
What airports do you fly into for Boulder from Seattle - Tacoma Intl. Airport (SEA)?
Denver Intl. Airport (DEN) is the only airport in Boulder with direct flights from Seattle - Tacoma Intl. Airport (SEA). Explore the options and discover affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal) last-minute?
Holding off until just before your departure to book your flight from SEA to WBU often results in higher prices. Although you may find some last-minute discounts, they're not always guaranteed. Keep your travel plans flexible for a better chance of getting a bargain.
Is it cheaper to book a SEA to WBU flight and hotel package?
Compared with arranging hotels and flights separately, booking a SEA to WBU flight and hotel package with Expedia could result in significant savings. What's more, managing everything in one place will take the stress out of planning your trip. Simply secure your flights and choose from our extensive range of stays, then personalize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Boulder, CO (WBU-Boulder Municipal)?
In most cases, you can modify or cancel your SEA to WBU flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you'd like more details, go to our Customer Service portal.

Travel information

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

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Seattle to Boulder Flights

The cheapest times to fly from Seattle to Boulder

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

 

The best time to book a flight from Seattle to Boulder

Sunday is one of the best days to book for cheap flights from Seattle to Boulder: 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 Seattle to Boulder

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 Seattle to Boulder 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 Seattle to Boulder 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 Seattle to Boulder 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.

 

Seattle to Boulder Flights

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*Available to One Key members.