$41+ Cheap flights from San Francisco (SFO) to Boulder, CO
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from San Francisco to Boulder with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.The best prices from San Francisco to Boulder are usually found in September or January, booked 40 days in advance, depart on a Friday or Wednesday and return on a Thursday
Cheap flight deals from San Francisco to Boulder
Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Boulder (BD9). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 30, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $79 (Cheapflightsfares) |
One-way from | $41 (Trip.com) |
Popular in | December |
Cheapest in | September |
Average price | $185 |
Find flight deals from San Francisco to Boulder
Cheapest flights from San Francisco to BoulderExplore the most affordable flight options available from San Francisco to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.
Explore the most affordable flight options available from San Francisco to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.
This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Orbitz deal was found by Cheapflights users on 1/30. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Alaska Airlines deal was found by Cheapflights users on 1/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 1/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 1/28. 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.
Find flights from San Francisco to Boulder within your budget
Customize your flight search to find flights from San Francisco to Boulder that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 30, 2025.
Fly from
Fly to
Route
Depart
Return
Price
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Sun 2/16
6:00 am-9:46 am
Nonstop2h 46m
Denver Intl
Thu 2/20
10:49 pm-12:43 am
Nonstop2h 54m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Fri 2/28
8:10 pm-11:51 pm
Nonstop2h 41m
Denver Intl
Tue 3/4
7:00 am-1:47 pm
1 stop7h 47m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Tue 3/4
2:43 pm-11:29 pm
1 stop7h 46m
Denver Intl
Wed 3/5
7:00 am-1:47 pm
1 stop7h 47m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Sat 3/1
3:52 pm-11:00 pm
1 stop6h 08m
Denver Intl
Mon 3/3
12:30 pm-6:25 pm
1 stop6h 55m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Wed 2/26
6:35 am-1:35 pm
1 stop6h 00m
Denver Intl
Sat 3/1
3:40 pm-10:50 pm
2 stops8h 10m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Thu 2/27
6:00 am-9:46 am
Nonstop2h 46m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Tue 3/4
4:39 pm-11:29 pm
1 stop5h 50m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Tue 4/15
5:00 am-8:38 am
Nonstop2h 38m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Tue 3/4
11:05 am-4:45 pm
1 stop4h 40m
San FranciscoDenver
SFO - DEN
SFODEN
San Francisco
Fri 2/28
5:30 am-1:07 pm
1 stop6h 37m
Best time to book a flight from San Francisco to Boulder
Have a flexible travel schedule? Discover the best time to fly to Boulder from San Francisco with our price prediction graph.
Travel insights for flights from San Francisco to Boulder
Get recent, data-driven insights about flights from San Francisco to Boulder including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from San Francisco to Boulder?
Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Boulder. Price data was last updated on January 24, 2025.
Booking 30 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Boulder. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from San Francisco to Boulder?
Currently, October is the cheapest month in which you can book a flight from San Francisco to Boulder (average of $197). Flying from San Francisco to Boulder in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SFO to BD9?
Find hourly flight availability from San Francisco to Boulder. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 30, 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Francisco to Boulder as you normally would.
What is the cheapest day to fly from San Francisco to Boulder?
Use this chart to determine the cheapest time to fly round-trip from San Francisco to Boulder. Price data was last updated on October 6, 2024.
Travelers seeking maximum savings on their San Francisco to Boulder flight should consider departing on Tuesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from San Francisco to Boulder
Explore weekly flight availability from San Francisco to Boulder. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 30, 2025.
The most flights from SFO to BD9 are scheduled on a Wednesday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).
Rainfall in Boulder by month
Plan your trip to Boulder by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Boulder ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Boulder when rainfall is around 0.5 in.
Temperature in Boulder by month
Plan your trip to Boulder by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Boulder, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).
Reviews of airlines servicing Boulder
Get insights into the airlines that provide service to Boulder. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Boulder. Reviews last updated January 30, 2025.
To help decide which airline to fly from San Francisco to Boulder, see what other customers have to say about Southwest, Alaska Airlines and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Entertainment
Overall
Boarding
Food
Crew
Reviews
Arlene,May 2024
SAN - OAK
Comfort
Entertainment
Overall
Boarding
Food
Crew
Reviews
Arlene,May 2024
SAN - OAK
Comfort
Entertainment
Overall
Boarding
Food
Crew
Reviews
Arlene,May 2024
SAN - OAK
Comfort
Entertainment
Overall
Boarding
Food
Crew
Reviews
Arlene,May 2024
SAN - OAK
Comfort
Entertainment
Overall
Boarding
Food
Crew
Reviews
Arlene,May 2024
SAN - OAK
Comfort
Entertainment
Overall
Boarding
Food
Crew
Reviews
Arlene,May 2024
SAN - OAK
Related info for your journey
Find useful and relevant information for your journey from San Francisco to Boulder. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for San Francisco to Boulder
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from San Francisco to Boulder
Discover the top 6 airlines that operate flights from San Francisco to Boulder. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 30, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$59 | Average$156 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$116 | Average$320 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$154 | Average$377 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$166 | Average$326 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$195 | Average$307 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$198 | Average$474 | FlexibilityNo cancel fee | On-time71% |