Cheapflights Tip: The best prices from Denver Intl to San Diego are usually found in February or January, booked 83 days in advance, depart on a Tuesday or Monday and return on a Saturday
Find flight deals from Denver to San Diego
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to San Diego (SAN). 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 13 February 2026.
Popular in
June
Cheapest in
February
Average price
C$ 183
Highest demand for flights based on searches. 10% potential increase in price (C$ 40 potential increase over avg. RT price).
Best time to book a flight from Denver to San Diego
Have a flexible travel schedule? Discover the best time to fly to San Diego from Denver with our price prediction graph.
DEN-SAN
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Denver to San Diego
Prices
Airlines
Delays
How far ahead should I book a flight from Denver to San Diego?
Use this chart to determine the optimal time to book a round-trip flight from Denver to San Diego. Price data was last updated on 6 February 2026.
To ensure you get the cheapest price possible for a flight from Denver to San Diego, you should look to book at least 83 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Denver to San Diego?
Currently, February is the cheapest month in which you can book a flight from Denver to San Diego (average of C$ 52). Flying from Denver to San Diego in September is currently the most expensive (average of C$ 101). 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 DEN to SAN?
Find hourly flight availability from Denver to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 February 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to San Diego as you normally would.
Weekly flight availability from Denver to San Diego
Explore weekly flight availability from Denver to San Diego. 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 13 February 2026.
The most flights from DEN to SAN are scheduled on a Friday (33 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (12 on average).
How often are flights from Denver to San Diego delayed?
About 21% of weekly flights between Denver and San Diego have experienced delays in the past year, with the average delay time being 127 minutes.
What is the most punctual flight time for Denver to San Diego flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Tuesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Denver to San Diego flights?
Over the past year, Alaska Airlines has had the lowest number of delays on this route, with just 14% of flights being delayed.
Reviews of airlines servicing San Diego
Get insights into the airlines that provide service to San Diego. 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 San Diego. Reviews last updated 13 February 2026.
Read through reviews of airlines operating flights from Denver to San Diego, such as Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Flight was canceled. Late notification and limited help with booking another flight.
Related info for your journey
Find useful and relevant information for your journey from Denver to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
How popular is this Denver to San Diego flight route?
Within the past month, 2 users have taken a look at flights from Denver Intl to San Diego.
What is the cheapest airline to fly from Denver to San Diego round-trip?
Currently priced at C$ 209, Frontier will fly you from Denver to San Diego and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Frontier is priced at 16% lower than the current average price of a flight leaving 3 months from now.
What are the most reliable airlines from Denver to San Diego?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Denver to San Diego on time: Alaska Airlines (81%), SkyWest Airlines (81%), Frontier (79%).
Can I find deals for flights from Denver to San Diego that include hotel bookings?
Yes. In addition to deals on Denver to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Denver to San Diego?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to San Diego.
Can I find deals for business class flights from Denver to San Diego?
Yes. Cheapflights offers flight deals from Denver to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Denver to San Diego?
Currently, February is the cheapest month in which you can book a flight from Denver to San Diego (average of C$ 52). Flying from Denver to San Diego in September is currently the most expensive (average of C$ 101). 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.
Explore flights to San Diego departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 13 February 2026.
Discover the top airline that operate flights from Denver to San Diego. 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 629,999 searches. Data last updated 13 February 2026.
Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Denver to San Diego?
Cheapflights makes it easy to find Denver to San Diego flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.
Why should you use Cheapflights to find cheap flight tickets from Denver to San Diego?
By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to San Diego from Denver.
Can Cheapflights find flights from Denver to San Diego with no change fees?
Users can book flights with no change fees policies with our dedicated filters. Book flights from Denver to San Diego flexibly with Cheapflights today.
Can Cheapflights notify me if prices for flights from Denver to San Diego become cheaper?
Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!
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