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$36+ 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 3/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
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

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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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 Thursday or Friday 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 January 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Wed 2/188:00 pm
DEN
-
SAN
Nonstop2h 41m
Frontier
Sun 2/226:25 am
SAN
-
DEN
Nonstop2h 35m
Frontier
Deal found 1/27$55
This Frontier deal was found by Cheapflights users on 1/28. 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.
Thu 2/2610:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Sun 3/19:09 am
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 1/28$56
This Frontier deal was found by Cheapflights users on 1/26. 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.
Thu 2/1910:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Sun 2/226:25 am
SAN
-
DEN
Nonstop2h 35m
Frontier
Deal found 1/26$57
This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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.
Sat 3/2110:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Wed 3/256:25 am
SAN
-
DEN
Nonstop2h 35m
Frontier
Deal found 1/27$61
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Fri 4/2410:29 pm
DEN
-
SAN
Nonstop2h 32m
Frontier
Mon 4/276:25 am
SAN
-
DEN
Nonstop2h 40m
Frontier
Deal found 1/26$64
This Frontier deal was found by Cheapflights users on 1/27. 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.
Thu 3/59:30 am
DEN
-
SAN
Nonstop2h 44m
Frontier
Sat 3/76:25 am
SAN
-
DEN
Nonstop2h 35m
Frontier
Deal found 1/27$65
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Fri 2/610:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Sat 2/2112:23 pm
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 1/27$67
This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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.
Fri 2/65:40 pm
DEN
-
SAN
Nonstop2h 41m
Frontier
Fri 2/208:35 am
SAN
-
DEN
Nonstop2h 34m
Frontier
Deal found 1/27$68
This Super.com deal was found by Cheapflights users on 1/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1810:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Mon 3/239:08 pm
SAN
-
DEN
Nonstop2h 29m
Frontier
Deal found 1/27$69
This Frontier deal was found by Cheapflights users on 1/27. 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.
Thu 3/1210:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Mon 3/169:00 am
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 1/27$70

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 January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$55
(Kiwi.com)

One-way from

$36
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$157

Good round-trip deal

$101 or less

Good one-way deal

$94 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. 10% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 28, 2026.
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

Sat 5/9

7:45 am-9:15 am

Nonstop2h 30m

San Diego

Sat 5/16

8:54 am-12:27 pm

Nonstop2h 33m

$117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 3/25

6:20 pm-7:58 pm

Nonstop2h 38m

San Diego

Tue 3/31

8:05 pm-11:44 pm

Nonstop2h 39m

$117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 5/8

3:49 pm-5:19 pm

Nonstop2h 30m

San Diego

Wed 5/13

7:00 pm-10:31 pm

Nonstop2h 31m

$117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 4/4

7:45 am-9:16 am

Nonstop2h 31m

San Diego

Mon 4/6

7:14 pm-10:45 pm

Nonstop2h 31m

$117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 3/18

7:25 am-9:06 am

Nonstop2h 41m

San Diego

Wed 3/18

1:48 pm-5:24 pm

Nonstop2h 36m

$155

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 3/6

8:00 pm-11:40 pm

1 stop4h 40m

San Diego

Sun 3/8

6:30 am-9:58 am

Nonstop2h 28m

$157

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 7/2

6:00 am-7:36 am

Nonstop2h 36m

San Diego

Mon 7/6

8:00 am-11:34 am

Nonstop2h 34m

$195

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 5/30

1:25 pm-2:50 pm

Nonstop2h 25m

San Diego

Wed 6/3

6:35 am-10:08 am

Nonstop2h 33m

$195

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 5/23

7:43 am-9:05 am

Nonstop2h 22m

San Diego

Fri 5/29

4:07 pm-7:39 pm

Nonstop2h 32m

$195

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 4/2

6:30 am-9:55 am

1 stop4h 25m

San Diego

Sat 4/11

10:40 am-6:00 pm

1 stop6h 20m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 23 results
1
2
3

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Super.comPrice Accuracy-Trust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Justfly.comPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-San Diego flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 January 23, 2026.

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, February 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 January 28, 2026.

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 January 24, 2026.

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
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier and Southwest

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 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 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 January 28, 2026.
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
11,799 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Alaska Airlines
8.0
Very good
11,799 reviews
Alaska Airlines
8.0
Very good
11,799 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Southwest
8.0
Very good
4,268 reviews
Alaska Airlines
8.0
Very good
11,799 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Hawaiian Airlines
7.8
Good
2,829 reviews
Alaska Airlines
8.0
Very good
11,799 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
United Airlines
7.4
Good
9,205 reviews
Alaska Airlines
8.0
Very good
11,799 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Frontier
5.7
Fair
3,056 reviews
Alaska Airlines
8.0
Very good
11,799 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Crew

8.5

Overall

8.0

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading

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 18 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, 102 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 $117, United Airlines can have you in San Diego from Denver in 2h 30m. 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 ($54), Hawaiian Airlines ($68), and Alaska Airlines ($97) offers the cheapest pricing from Denver to San Diego. Frontier is 71% 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 $38. Alaska Airlines flights start at $58 while deals on Southwest start at $59 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 SkyWest Airlines (81%), Alaska Airlines (81%) and Frontier (78%).

  • 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 $810, our data indicates the cheapest price to be $34. The most popular route (Denver Intl - San Diego), is priced around $55.

  • 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 $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
National City
Coronado
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 January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$167FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$68Average$167FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$97Average$197FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$117Average$255FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$117Average$277FlexibilityNo cancel feeOn-time69%

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