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$53+ 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
out 19 — out 261
dom 10/19
dom 10/26
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to San Diego are usually found in October or February, booked 61 days in advance, depart on a Tuesday or Saturday and return on a Thursday

Cheap 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 setembro 19, 2025.

Round-trip from

$81
(Kiwi.com)

One-way from

$53
(Frontier)

Popular in

March

Cheapest in

October

Average price

$182

Good round-trip deal

$124 or less

Good one-way deal

$81 or less
From Denver Intl to San Diego
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One-way flight from Denver Intl to San Diego
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Highest demand for flights based on searches. 1% potential increase in price ($2 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Denver Intl to San Diego.
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Price to beat on a one-way flight from Denver Intl to San Diego.
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Find 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 setembro 19, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
seg 10/1310:29 pmDEN - SAN
Nonstop2h 21mFrontier
qui 10/1610:52 amSAN - DEN
Nonstop2h 39mFrontier
Deal found 9/16$81
This Priceline deal was found by Cheapflights users on 9/18. 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.
sex 10/248:30 amDEN - SAN
Nonstop2h 27mFrontier
seg 10/279:03 pmSAN - DEN
Nonstop2h 43mFrontier
Deal found 9/18$82
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
ter 10/2810:29 pmDEN - SAN
Nonstop2h 21mFrontier
sáb 11/15:28 pmSAN - DEN
Nonstop2h 31mFrontier
Deal found 9/16$83
This Booking.com deal was found by Cheapflights users on 9/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 11/18:50 pmDEN - SAN
Nonstop2h 35mFrontier
sáb 11/87:30 pmSAN - DEN
Nonstop2h 41mFrontier
Deal found 9/17$84
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
sáb 10/48:50 pmDEN - SAN
Nonstop2h 34mFrontier
seg 10/66:35 amSAN - DEN
Nonstop2h 33mFrontier
Deal found 9/18$85
This Trip.com deal was found by Cheapflights users on 9/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 10/2110:29 pmDEN - SAN
Nonstop2h 21mMultiple Airlines
sáb 10/253:37 pmSAN - DEN
Nonstop2h 33mMultiple Airlines
Deal found 9/18$86
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
seg 10/278:30 amDEN - SAN
Nonstop2h 27mFrontier
ter 11/42:24 pmSAN - DEN
Nonstop2h 33mFrontier
Deal found 9/16$87
This Trip.com deal was found by Cheapflights users on 9/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 10/237:01 amDEN - SAN
Nonstop2h 24mMultiple Airlines
dom 10/266:41 amSAN - DEN
Nonstop2h 37mMultiple Airlines
Deal found 9/17$88
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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.
sex 10/246:00 amDEN - SAN
1 stop7h 11mFrontier
qua 10/296:41 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 9/16$90
This United Airlines deal was found by Cheapflights users on 9/16. 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.
sex 12/59:00 pmDEN - SAN
Nonstop2h 30mUnited Airlines
dom 12/76:30 amSAN - DEN
Nonstop2h 30mUnited Airlines
Deal found 9/16$91
This Frontier deal was found by Cheapflights users on 9/16. 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.
sáb 10/2512:00 pmDEN - SAN
Nonstop2h 28mFrontier
qua 11/58:00 amSAN - DEN
1 stop11h 04mFrontier
Deal found 9/16$92
This Kiwi.com deal was found by Cheapflights users on 9/18. 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.
qua 11/267:20 pmDEN - SAN
Nonstop2h 28mMultiple Airlines
ter 12/96:25 amSAN - DEN
Nonstop2h 38mMultiple Airlines
Deal found 9/18$93

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 setembro 19, 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

qui 10/30

12:49 pm-2:15 pm

Nonstop2h 26m

San Diego

ter 11/4

8:29 pm-11:51 pm

Nonstop2h 22m

$91

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

sex 12/5

6:59 pm-8:23 pm

Nonstop2h 24m

San Diego

dom 12/7

4:02 pm-7:24 pm

Nonstop2h 22m

$91

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

dom 11/2

9:25 pm-10:55 pm

Nonstop2h 30m

San Diego

qui 11/6

5:35 pm-10:35 pm

1 stop4h 00m

$96

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

qui 10/23

9:40 pm-11:05 pm

Nonstop2h 25m

San Diego

seg 10/27

5:50 pm-11:10 pm

1 stop4h 20m

$101

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

sex 12/12

6:59 pm-8:23 pm

Nonstop2h 24m

San Diego

qui 12/18

3:44 pm-7:18 pm

Nonstop2h 34m

$114

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

sáb 10/25

7:50 pm-9:19 pm

Nonstop2h 29m

San Diego

dom 11/2

3:48 pm-7:06 pm

Nonstop2h 18m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

ter 12/2

6:59 pm-8:23 pm

Nonstop2h 24m

San Diego

dom 12/7

4:02 pm-7:24 pm

Nonstop2h 22m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

qua 10/29

11:00 am-2:20 pm

1 stop4h 20m

San Diego

qua 11/5

4:50 pm-9:35 pm

1 stop3h 45m

$132

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

qui 11/20

1:30 pm-4:55 pm

1 stop4h 25m

San Diego

sáb 11/22

8:40 pm-12:05 am

Nonstop2h 25m

$132

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

qua 10/8

8:10 am-11:55 am

1 stop4h 45m

San Diego

sáb 10/11

11:30 am-4:40 pm

1 stop4h 10m

$136

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 24 results
1
2
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The best insider tips for Denver to San Diego flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
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

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 September 12, 2025.

Booking 61 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, August is the cheapest month in which you can book a flight from Denver to San Diego (average of $286). Flying from Denver to San Diego in March is currently the most expensive (average of $366). 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 setembro 19, 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 September 14, 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. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 setembro 19, 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
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

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
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

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
2,732 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

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
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

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
3,171 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Food

7.1

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 21 daily flights to San Diego from 5 different airlines. 2h 17m 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, 76 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 $114, Alaska Airlines can have you in San Diego from Denver in 2h 24m. The distance from Denver to San Diego is about 852 mi. All flights are typically nonstop.

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

    According to our current data, Frontier ($68), Hawaiian Airlines ($78), and Alaska Airlines ($127) offers the cheapest pricing from Denver to San Diego. Frontier is 65% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 (78%), Air Canada (72%) and United Airlines (70%).

  • 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 $576, our data indicates the cheapest price to be $40. The most popular route (Denver Intl - San Diego), is priced around $83.

  • 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, August is the cheapest month in which you can book a flight from Denver to San Diego (average of $286). Flying from Denver to San Diego in March is currently the most expensive (average of $366). 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
La Mesa
Poway
Lemon Grove
Coronado
Imperial Beach
National City

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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 setembro 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$168FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$173FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$127Average$192FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$146Average$267FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$153Average$307FlexibilityNo cancel feeOn-time69%

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