$25 Cheap Flights from Denver (DEN) to San Diego (SAN)

View $25 flight on Wed, Sep 10, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)

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Today's featured flight deals from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Denver to San Diego (DEN-SAN)

Prices were available within the past 7 days and start at $25 for one-way flights and $49 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Sep 10 - Mon, Sep 15
DEN
Denver
SAN
San Diego
$49 Roundtrip, just found
$49
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Sep 10 from Denver to San Diego, returning Mon, Sep 15, priced at $49 just found
Frontier Airlines
Wed, Sep 3 - Thu, Sep 25
DEN
Denver
SAN
San Diego
$65 Roundtrip, just found
$65
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Sep 3 from Denver to San Diego, returning Thu, Sep 25, priced at $65 just found
Frontier Airlines
Tue, Sep 23 - Sun, Sep 28
DEN
Denver
SAN
San Diego
$69 Roundtrip, just found
$69
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Sep 23 from Denver to San Diego, returning Sun, Sep 28, priced at $69 just found
Frontier Airlines
Thu, Nov 13 - Tue, Nov 18
DEN
Denver
SAN
San Diego
$76 Roundtrip, found 3 hours ago
$76
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Thu, Nov 13 from Denver to San Diego, returning Tue, Nov 18, priced at $76 found 3 hours ago
Frontier Airlines
Thu, Sep 4 - Tue, Sep 9
DEN
Denver
SAN
San Diego
$80 Roundtrip, found 3 hours ago
$80
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Thu, Sep 4 from Denver to San Diego, returning Tue, Sep 9, priced at $80 found 3 hours ago
Southwest Airlines
Tue, Oct 21 - Mon, Oct 27
DEN
Denver
SAN
San Diego
$83 Roundtrip, found 1 hour ago
$83
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Tue, Oct 21 from Denver to San Diego, returning Mon, Oct 27, priced at $83 found 1 hour ago
Frontier Airlines
Sun, Sep 14 - Tue, Sep 16
DEN
Denver
SAN
San Diego
$84 Roundtrip, found 2 hours ago
$84
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sun, Sep 14 from Denver to San Diego, returning Tue, Sep 16, priced at $84 found 2 hours ago
United
Tue, Nov 11 - Thu, Nov 13
DEN
Denver
SAN
San Diego
$96 Roundtrip, found 7 hours ago
$96
Roundtrip
found 7 hours ago
Select United flight, departing Tue, Nov 11 from Denver to San Diego, returning Thu, Nov 13, priced at $96 found 7 hours ago
Alaska Airlines
Wed, Oct 22 - Fri, Oct 24
DEN
Denver
SAN
San Diego
$103 Roundtrip, just found
$103
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Oct 22 from Denver to San Diego, returning Fri, Oct 24, priced at $103 just found
Hawaiian Airlines
Wed, Oct 8 - Sun, Oct 19
DEN
Denver
SAN
San Diego
$137 Roundtrip, found 1 day ago
$137
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Wed, Oct 8 from Denver to San Diego, returning Sun, Oct 19, priced at $137 found 1 day ago

Find the cheapest month to fly from Denver (DEN) to San Diego (SAN)

March is typically the cheapest month to fly

From $58 - $351 per traveler.

Graph displaying average flight prices per month

Alternative airports near San Diego

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to General Abelardo L. Rodriguez Intl. TIJ. Average driving time to city center is 26 minutes. Flights from $368
TIJ
General Abelardo L. Rodriguez Intl.
Average driving time to city center26 min
Flights from $368
Select flight to McClellan-Palomar CLD. Average driving time to city center is 38 minutes. Flights from $448
CLD
McClellan-Palomar
Average driving time to city center38 min
Flights from $448
Flights from Denver (DEN) to San Diego (SAN)
Origin airport
Denver Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$48
Distance
852 mi
Average flight time
1 hour 23 mins

Denver to San Diego Flights

The cheapest times to fly from Denver to San Diego

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

 

The best time to book a flight from Denver to San Diego

Sunday is one of the best days to book for cheap flights from Denver to San Diego: 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 Denver to San Diego

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 Denver to San Diego in 2025. You can also book with separate airlines for your outbound and return journeys, from $25 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 Denver to San Diego 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 Denver to San Diego 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.

 

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) cost?
Grab a cheap one-way flight from $25 or cheap return flight from $49 from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
September is the most affordable month to fly from DEN to SAN. Traveling during an off-peak travel window is often the key to finding better fares.
Which airlines fly direct from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
Avoid the detours and travel nonstop to San Diego Intl. Airport (SAN) from Denver Intl. Airport (DEN) with 3 carriers, including:

  • Southwest Airlines
  • United Airlines
  • Frontier Airlines

What is the cheapest airline that flies from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
While prices may vary depending on your travel dates, Frontier Airlines and United Airlines are often among the top picks for flights between Denver Intl. Airport (DEN) and San Diego Intl. Airport (SAN). You can also compare carriers on Expedia and use the "Sort by" filter to find the cheapest ticket for your DEN to SAN flight.
How many flights per day from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
Every day, an average of 13 direct flights operate from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN). Select the departure date that best suits your plans.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
The 11 AM departures from DEN to SAN are the busiest. Prices can be higher for these popular slots. If you want to save money, book during off-peak hours.
What day of the week has the most flights from DEN to SAN?
Sunday offers the most flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN). Consider traveling on this day and you'll have a greater chance of finding a departure that fits your plans.
What is the earliest flight from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
Denver Intl. Airport (DEN)'s first flight to San Diego Intl. Airport (SAN) takes off at approximately 6:25AM UTC-7. With a total travel time of 2h 45m, you'll touch down at around 8:10AM UTC-8.
How long does it take to fly from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
It takes roughly 2 hours and 32 minutes to fly the 850 mi from DEN to SAN.
What airline has the least delays from DEN to SAN?
With 100% of journeys typically arriving on time, American Airlines has the best on-time performance for direct flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN). To monitor your flight status and receive notifications if anything changes, simply head to the Expedia App.
What is the best time to fly from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
To touch down at San Diego Intl. Airport (SAN) without delays, pick a flight that leaves from Denver Intl. Airport (DEN) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 San Diego from Denver Intl. Airport (DEN)?
San Diego Intl. Airport (SAN) is the only airport in San Diego with direct flights from Denver Intl. Airport (DEN). Check out the options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) last-minute?
Waiting until just before your trip to book your flight from DEN to SAN generally means paying more. While it's possible to find some last-minute deals, they aren't always guaranteed. Be flexible with your travel plans for the best chance of scoring a bargain.
Is it cheaper to book a DEN to SAN flight and hotel package?
Compared with arranging flights and hotels separately, booking a DEN to SAN flight and hotel package with Expedia could result in significant savings. Better still, managing everything in one place takes the hassle out of planning your trip. Simply secure your flights and select from our wide range of hotels, then customize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
In most cases, you can modify or cancel your DEN to SAN flight. However, additional charges may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need more details, visit our Customer Service portal.

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*Available to One Key members.