Cheap Flights from San Francisco (SFO) to Boulder (WBU)

Popular airlines from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal)

Frequently asked questions

How much does a flight from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal) cost?
Snag a cheap one-way flight or cheap return flight from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal)?
Traveling in is a good way to save, as it's the cheapest month for flights between SFO and WBU. You'll usually find the lowest fares during the off-season.
What is the cheapest airline that flies from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal)?
To find the cheapest airline flying from SFO to WBU, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal)?
Nonstop flights from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SFO to WBU?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal)?
To avoid possible delays on the San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal) route, aim to travel before 3 PM. Departures after this time have a 22% higher chance of being 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 San Francisco Intl. Airport (SFO)?
Denver Intl. Airport (DEN) is the only airport in Boulder with direct flights from San Francisco Intl. Airport (SFO). Explore your options and discover cheap fares on Expedia.
Is it cheaper to buy a plane ticket from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal) last-minute?
Booking your flight from SFO to WBU shortly before your journey is generally more expensive. But if there's some wiggle room with your travel dates and times, you could grab a cheap last-minute fare.
Is it cheaper to book a SFO to WBU flight and hotel package?
Opting for a SFO to WBU flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Choose from our wide range of accommodations and then add car rentals, flights and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Francisco Intl. Airport (SFO) to Boulder, CO (WBU-Boulder Municipal)?
If you booked your SFO to WBU flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of fare you have, 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 if you'd like more information.

Travel information

Origin airport
San Francisco Intl.
Destination airport
Boulder Municipal
Distance
936 mi

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San Francisco to Boulder Flights

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

 

The best time to book a flight from San Francisco to Boulder

Sunday is one of the best days to book for cheap flights from San Francisco 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 San Francisco 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 San Francisco 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 San Francisco 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 San Francisco 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.

 

San Francisco to Boulder Flights

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*Available to One Key members.