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$44+ Cheap flights from Denver to San Diego (DEN - SAN)

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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
1 adult, Economy
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Find cheap flights from Denver to San Diego with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Denver Intl to San Diego are usually found in January or October, booked 83 days in advance, depart on a Wednesday or Thursday and return on a Friday

Cheap flight deals from Denver to San Diego

Cheapest flights from Denver to San Diego
Explore the most affordable flight options available from Denver to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 15, 2025.

This Priceline deal was found by Cheapflights users on 12/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:15 amDEN - SAN
1 stop4h 42mFrontier
mar. 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/13$111
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/2910:37 pmDEN - SAN
1 stop14h 34mFrontier
mar. 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/15$123
This Frontier deal was found by Cheapflights users on 12/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/256:15 amDEN - SAN
1 stop4h 42mFrontier
mar. 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/15$135
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/3110:29 pmDEN - SAN
1 stop12h 28mFrontier
mié. 1/73:29 pmSAN - DEN
Nonstop2h 34mFrontier
Deal found 12/14$137
This Kiwi.com deal was found by Cheapflights users on 12/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:15 amDEN - SAN
1 stop4h 42mFrontier
lun. 1/52:10 pmSAN - DEN
1 stop18h 52mFrontier
Deal found 12/13$152
This Kiwi.com deal was found by Cheapflights users on 12/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:15 amDEN - SAN
1 stop4h 42mMultiple Airlines
lun. 1/58:14 pmSAN - DEN
Nonstop2h 45mMultiple Airlines
Deal found 12/13$159
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/306:15 amDEN - SAN
1 stop4h 42mFrontier
mar. 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/14$160
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/2410:29 pmDEN - SAN
1 stop22h 55mFrontier
mar. 12/309:14 pmSAN - DEN
1 stop10h 41mFrontier
Deal found 12/15$163

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 diciembre 15, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$56
(Super.com)

One-way from

$44
(Orbitz)

Popular in

March

Cheapest in

January

Average price

$185

Good round-trip deal

$119 or less

Good one-way deal

$98 or less
Provider with most accurate pricing for Denver Intl-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-San Diego flights.
Search Deals
From Denver Intl to San Diego
Search Deals
One-way flight from Denver Intl to San Diego
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($5 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Denver Intl to San Diego.
Search Deals
Price to beat on a one-way flight from Denver Intl to San Diego.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver to San Diego 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 diciembre 15, 2025.
Use the filters below to find and compare flights from Denver to San Diego that are best for you.

Fly from

Denver

Fly to

San Diego

Route

Depart

Return

Price

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

lun. 1/26

10:29 pm-12:08 am

Nonstop2h 39m

San Diego

lun. 2/2

6:30 am-10:05 am

Nonstop2h 35m

$57

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

mar. 1/20

8:45 am-1:25 pm

1 stop5h 40m

San Diego

dom. 1/25

6:20 am-9:50 am

Nonstop2h 30m

$157

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

vie. 1/16

7:39 pm-9:14 pm

Nonstop2h 35m

San Diego

mié. 1/28

4:01 pm-11:35 pm

1 stop6h 34m

$167

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

vie. 3/6

12:50 pm-3:55 pm

1 stop4h 05m

San Diego

sáb. 3/7

6:15 am-12:00 pm

1 stop4h 45m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

vie. 2/27

7:35 pm-11:40 pm

1 stop5h 05m

San Diego

dom. 3/1

6:15 am-2:34 pm

1 stop7h 19m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

jue. 1/8

6:14 am-9:57 am

1 stop4h 43m

San Diego

dom. 1/11

6:15 am-11:54 am

1 stop4h 39m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

lun. 1/12

12:49 pm-4:36 pm

1 stop4h 47m

San Diego

vie. 1/16

4:20 pm-11:11 pm

1 stop5h 51m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

jue. 2/26

7:13 pm-8:51 pm

Nonstop2h 38m

San Diego

dom. 3/1

6:30 am-9:58 am

Nonstop2h 28m

$207

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

lun. 1/12

5:09 pm-11:09 pm

1 stop7h 00m

San Diego

mar. 1/13

4:01 pm-11:35 pm

1 stop6h 34m

$251

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

mié. 12/31

8:05 am-9:40 am

Nonstop2h 35m

San Diego

mié. 1/7

1:00 pm-4:31 pm

Nonstop2h 31m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 23 results
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Compare providers for flights from Denver to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to San Diego in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Denver-San Diego flights, users find the pricing of Justfly.com to be most consistent on Cheapflights vs. Justfly.com Users can find the same prices on Denver-San Diego flight deals on Cheapflights vs. Justfly.com >95% of the time. Price accuracy is based on data collected from Denver-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-San Diego flights, Cheapflights users trust Justfly.com the most. Justfly.com has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.
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

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 December 12, 2025.

Booking 83 days in advance of your planned departure date is, on average, the best time to get cheap flights from Denver to San Diego. 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 Denver to San Diego?

Currently, January is the cheapest month in which you can book a flight from Denver to San Diego (average of $38). Flying from Denver to San Diego in September is currently the most expensive (average of $75). 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 diciembre 15, 2025.

When flying from Denver to San Diego, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 38% versus a flight at noon.

What is the cheapest day to fly from Denver to San Diego?

Use this chart to determine the cheapest time to fly round-trip from Denver to San Diego. Price data was last updated on December 13, 2025.

Travelers seeking maximum savings on their Denver to San Diego flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Denver to San Diego flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to San Diego trip
Airlines
Frontier

Frontier's UpFront Plus seats guarantee an empty middle seat for more comfort.


Frontier offers no in-flight entertainment or Wi-Fi; bring your own entertainment.

Read more about FrontierBy Marisa Garcia
Southwest

Southwest offers free snacks and non-alcoholic beverages, enhancing the short-haul experience.


Southwest's open seating policy allows efficient boarding, ideal for short-haul flights.

Read more about SouthwestBy Marisa Garcia
Airports
DEN

For a quick departure, use the A Line train to reach DEN from downtown in 37 minutes, avoiding traffic and parking hassles.

Read more about DENBy Emily Zemler
SAN

For a stress-free arrival at SAN, consider the free San Diego Flyer shuttle connecting to the Old Town Transit Center every 20-30 minutes.

Read more about SANBy Blane Bachelor
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier and Southwest

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Blane Bachelor

Blane Bachelor

Expert on SAN

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

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 diciembre 15, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Hawaiian Airlines from Denver to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,452 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
7.9
Good
4,250 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Hawaiian Airlines
7.8
Good
2,819 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
9,092 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,080 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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.

  • What airports do I use to fly from Denver to San Diego?

    San Diego is the airport most travelers will use when flying to San Diego from Denver Intl. Booking flights from Denver Intl (DEN) to San Diego (SAN) should be relatively easy as there are 22 daily flights to San Diego from 5 different airlines. 2h 20m is how long a flight from Denver to San Diego will take if you book a nonstop flight.

  • How popular is this Denver to San Diego flight route?

    Within the past month, 82 users have taken a look at flights from Denver Intl to San Diego.

  • How long is the flight from Denver to San Diego?

    For as low as $167, Frontier can have you in San Diego from Denver in 2h 35m. The distance from Denver to San Diego is about 852 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Denver to San Diego round-trip?

    According to our current data, Frontier ($56), Hawaiian Airlines ($68), and Alaska Airlines ($109) offers the cheapest pricing from Denver to San Diego. Frontier is 70% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Denver to San Diego one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $39. Alaska Airlines flights start at $58 while deals on Southwest start at $68 one-way.

  • What are the most reliable airlines from Denver to San Diego?

    The top 3 most reliable airlines when flying from Denver to San Diego are Frontier (84%), Lufthansa (82%) and United Airlines (80%).

  • What are the cheapest flights from Denver to San Diego?

    Looking for the cheapest flight from Denver to San Diego? While on average our users pay $267, our data indicates the cheapest price to be $39. The most popular route (Denver Intl - San Diego), is priced around $57.

  • 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, January is the cheapest month in which you can book a flight from Denver to San Diego (average of $38). Flying from Denver to San Diego in September is currently the most expensive (average of $75). 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.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
National City
La Mesa
Poway
Julian
Lemon Grove

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Alternative routes for Denver to San Diego

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Top 5 airlines flying from Denver to San Diego

Discover the top 5 airlines 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 2,558,603 searches. Data last updated diciembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$57Average$170FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$168FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$113Average$207FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$117Average$258FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$122Average$292FlexibilityNo cancel feeOn-time69%

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