$48+ Cheap flights from San Diego (SAN) 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 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from San Diego 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 Diego to Boulder are usually found in April or January, booked 44 days in advance, depart on a Thursday or Friday and return on a Saturday
Cheap flight deals from San Diego to Boulder
Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) 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 21, 2025.
Round-trip from | $72 (Cheapflightsfares) |
|---|---|
One-way from | $48 (Cheapflightsfares) |
Popular in | December |
Cheapest in | April |
Average price | $150 |
Find flight deals from San Diego to Boulder
Cheapest flights from San Diego to BoulderExplore the most affordable flight options available from San Diego to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2025.
Explore the most affordable flight options available from San Diego to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2025.
This Cheapflightsfares deal was found by Cheapflights users on 1/21. 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 United Airlines deal was found by Cheapflights users on 1/20. 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 United 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 1/20. 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 Expedia deal was found by Cheapflights users on 1/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flights from San Diego to Boulder within your budget
Customize your flight search to find flights from San Diego 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 21, 2025.
Fly from
Fly to
Route
Depart
Return
Price
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 2/25
4:06 pm-7:33 pm
Nonstop2h 27m
Denver Intl
Fri 2/28
10:43 pm-12:20 am
Nonstop2h 37m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Wed 2/19
6:15 am-12:19 pm
1 stop5h 04m
Denver Intl
Wed 2/26
10:15 am-2:59 pm
1 stop5h 44m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 2/25
1:25 pm-12:17 am
1 stop9h 52m
Denver Intl
Wed 2/26
6:25 am-12:30 pm
1 stop7h 05m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 2/25
6:15 am-7:12 pm
2 stops11h 57m
Denver Intl
Wed 2/26
8:53 pm-9:29 am
1 stop13h 36m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 2/25
6:15 am-9:20 pm
2 stops14h 05m
Denver Intl
Wed 2/26
7:00 am-8:19 pm
2 stops14h 19m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 4/22
10:35 am-2:10 pm
Nonstop2h 35m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Sat 2/22
7:00 pm-10:20 pm
Nonstop2h 20m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Wed 2/19
10:20 am-3:27 pm
1 stop4h 07m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Wed 3/19
1:25 pm-11:48 pm
1 stop9h 23m
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 3/11
1:39 pm-11:29 pm
2 stops8h 50m
Best time to book a flight from San Diego to Boulder
Have a flexible travel schedule? Discover the best time to fly to Boulder from San Diego with our price prediction graph.
Travel insights for flights from San Diego to Boulder
Get recent, data-driven insights about flights from San Diego to Boulder including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from San Diego to Boulder?
Use this chart to determine the optimal time to book a round-trip flight from San Diego to Boulder. Price data was last updated on January 17, 2025.
Booking 44 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Diego 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 Diego to Boulder?
Currently, October is the cheapest month in which you can book a flight from San Diego to Boulder (average of $197). Flying from San Diego 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 SAN to BD9?
Find hourly flight availability from San Diego 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 21, 2025.
When flying from San Diego to Boulder, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
What is the cheapest day to fly from San Diego to Boulder?
Use this chart to determine the cheapest time to fly round-trip from San Diego to Boulder. Price data was last updated on March 31, 2024.
Travelers seeking maximum savings on their San Diego to Boulder flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from San Diego to Boulder
Explore weekly flight availability from San Diego 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 21, 2025.
The most flights from SAN to BD9 are scheduled on a Monday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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 21, 2025.
Read reviews from past customers who have flown Frontier and United Airlines from San Diego to Boulder. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
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My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
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My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Comfort
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Overall
Entertainment
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Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Comfort
Food
Overall
Entertainment
Crew
Boarding
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Comfort
Food
Overall
Entertainment
Crew
Boarding
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Comfort
Food
Overall
Entertainment
Crew
Boarding
Reviews
My original flight was delayed so they found this flight for me so I could arrive at a reasonable time
Related info for your journey
Find useful and relevant information for your journey from San Diego 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 Diego to Boulder
See prices for flight routes from nearby airports that may be better suited for you.
Top 5 airlines flying from San Diego to Boulder
Discover the top 5 airlines that operate flights from San Diego 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 21, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$149 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$330 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$167 | Average$369 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$195 | Average$265 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$231 | Average$360 | FlexibilityNo cancel fee | On-time71% |