$44 Cheap Flights from Denver (DEN) to San Diego (SAN)

View $44 flight on Tue, Oct 14, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $44 for one-way flights and $88 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Oct 14 - Sat, Oct 25
DEN
Denver
SAN
San Diego
$88 Roundtrip, just found
$88
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Oct 14 from Denver to San Diego, returning Sat, Oct 25, priced at $88 just found
Frontier Airlines
Mon, Oct 13 - Sat, Oct 18
DEN
Denver
SAN
San Diego
$98 Roundtrip, just found
$98
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Oct 13 from Denver to San Diego, returning Sat, Oct 18, priced at $98 just found
Frontier Airlines
Sat, Aug 16 - Mon, Aug 18
DEN
Denver
SAN
San Diego
$108 Roundtrip, just found
$108
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 16 from Denver to San Diego, returning Mon, Aug 18, priced at $108 just found
Frontier Airlines
Tue, Oct 14 - Sat, Oct 25
DEN
Denver
SAN
San Diego
$112 Roundtrip, just found
$112
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Oct 14 from Denver to San Diego, returning Sat, Oct 25, priced at $112 just found
Alaska Airlines
Tue, Oct 14 - Sat, Oct 25
DEN
Denver
SAN
San Diego
$113 Roundtrip, just found
$113
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Oct 14 from Denver to San Diego, returning Sat, Oct 25, priced at $113 just found
Frontier Airlines
Sat, Aug 9 - Wed, Aug 13
DEN
Denver
SAN
San Diego
$118 Roundtrip, just found
$118
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 9 from Denver to San Diego, returning Wed, Aug 13, priced at $118 just found
Frontier Airlines
Wed, Oct 15 - Sun, Oct 19
DEN
Denver
SAN
San Diego
$122 Roundtrip, just found
$122
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Oct 15 from Denver to San Diego, returning Sun, Oct 19, priced at $122 just found
American Airlines
Tue, Sep 30 - Sat, Oct 4
DEN
Denver
SAN
San Diego
$124 Roundtrip, found 6 hours ago
$124
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Tue, Sep 30 from Denver to San Diego, returning Sat, Oct 4, priced at $124 found 6 hours ago
Southwest Airlines
Thu, Sep 25 - Sat, Oct 4
DEN
Denver
SAN
San Diego
$133 Roundtrip, found 1 hour ago
$133
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Thu, Sep 25 from Denver to San Diego, returning Sat, Oct 4, priced at $133 found 1 hour ago
United
Tue, Aug 12 - Thu, Aug 21
DEN
Denver
SAN
San Diego
$138 Roundtrip, found 1 hour ago
$138
Roundtrip
found 1 hour ago
Select United flight, departing Tue, Aug 12 from Denver to San Diego, returning Thu, Aug 21, priced at $138 found 1 hour ago

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

August is typically the cheapest month to fly

From $48 - $136 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 $349
TIJ
General Abelardo L. Rodriguez Intl.
Average driving time to city center26 min
Flights from $349
Select flight to McClellan-Palomar CLD. Average driving time to city center is 38 minutes. Flights from $247
CLD
McClellan-Palomar
Average driving time to city center38 min
Flights from $247
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, JetBlue Airways, Southwest Airlines, United
Roundtrip price
$88
Distance
852 mi
Average flight time
1 hour 20 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 October. 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 $44 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?
Cheap return fares from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) start at $103. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving DEN on July 9 2025 and touching down at SAN. The price was last updated on July 1 2025 and has not changed since.
What is the cheapest month to fly from DEN to SAN?
Fly nonstop from DEN to SAN in November to score cheaper tickets. You can find a one-way Frontier Airlines flight for $54 leaving on November 17 2025. This price is based on the cheapest direct flight found on Expedia for this route in the next 330 days. The price was last updated on July 1 2025 and remains unchanged.
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 DEN to SAN?
Take off from DEN to SAN with Frontier Airlines. This airline currently has the cheapest one-way fare for this route, starting at $54. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from DEN on September 25 2025. Prices were last updated on July 1 2025 and have not changed since.
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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