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Cheap flights from Denver to San Diego (DEN - SAN) - Compare and Save

DEN — SAN
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to San Diego are usually found in September or October, booked 61 days in advance, depart on a Tuesday or Saturday and return on a Saturday

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 June 18, 2025.

Round-trip from

$126
(Frontier)

One-way from

$79
(Southwest)

Popular in

March

Cheapest in

September

Average price

$204

Good round-trip deal

$182 or less

Good one-way deal

$109 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. 4% potential increase in price ($8 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 June 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 June 18, 2025.

This Frontier deal was found by Cheapflights users on 6/15. 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.
Sat 7/269:36 pmDEN - SAN
Nonstop2h 26mFrontier
Tue 8/56:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/15$126
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/159:36 pmDEN - SAN
Nonstop2h 26mFrontier
Wed 7/166:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/15$127
This SmartFares deal was found by Cheapflights users on 6/17. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/229:36 pmDEN - SAN
Nonstop2h 26mFrontier
Tue 7/296:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/17$128
This Cheapflightsfares deal was found by Cheapflights users on 6/16. 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.
Sun 8/1710:29 pmDEN - SAN
Nonstop2h 23mFrontier
Thu 8/218:26 pmSAN - DEN
Nonstop2h 40mFrontier
Deal found 6/16$135
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1010:29 pmDEN - SAN
Nonstop2h 21mFrontier
Mon 10/136:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/15$136
This Cheapflightsfares deal was found by Cheapflights users on 6/16. 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.
Fri 8/110:29 pmDEN - SAN
Nonstop2h 23mFrontier
Tue 8/56:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/16$138
This Cheapflightsfares deal was found by Cheapflights users on 6/16. 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.
Sat 8/29:36 pmDEN - SAN
Nonstop2h 26mFrontier
Tue 8/56:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/16$139
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/69:44 amDEN - SAN
Nonstop2h 26mFrontier
Thu 8/146:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/15$140
This Frontier deal was found by Cheapflights users on 6/15. 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.
Fri 8/110:29 pmDEN - SAN
Nonstop2h 23mFrontier
Wed 8/66:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/15$141
This Frontier deal was found by Cheapflights users on 6/15. 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.
Thu 10/96:36 pmDEN - SAN
Nonstop2h 32mFrontier
Wed 10/156:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/15$143
This Priceline deal was found by Cheapflights users on 6/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2510:29 pmDEN - SAN
Nonstop2h 23mFrontier
Tue 7/296:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/17$144
This SmartFares deal was found by Cheapflights users on 6/17. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/710:29 pmDEN - SAN
Nonstop2h 23mFrontier
Sun 8/106:25 amSAN - DEN
Nonstop2h 37mFrontier
Deal found 6/17$146

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 June 18, 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

Sat 7/26

9:36 pm-11:02 pm

Nonstop2h 26m

San Diego

Tue 8/5

6:25 am-10:02 am

Nonstop2h 37m

$126

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 7/15

9:36 pm-11:02 pm

Nonstop2h 26m

San Diego

Wed 7/16

6:25 am-10:02 am

Nonstop2h 37m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 7/22

9:36 pm-11:02 pm

Nonstop2h 26m

San Diego

Tue 7/29

6:25 am-10:02 am

Nonstop2h 37m

$128

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 8/16

9:36 pm-11:02 pm

Nonstop2h 26m

San Diego

Sun 8/17

6:25 am-10:02 am

Nonstop2h 37m

$133

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 8/17

10:29 pm-11:52 pm

Nonstop2h 23m

San Diego

Thu 8/21

8:26 pm-12:06 am

Nonstop2h 40m

$135

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 8/8

10:29 pm-11:52 pm

Nonstop2h 23m

San Diego

Sat 8/16

6:25 am-10:02 am

Nonstop2h 37m

$136

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 8/1

10:29 pm-11:52 pm

Nonstop2h 23m

San Diego

Tue 8/5

6:25 am-10:02 am

Nonstop2h 37m

$138

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 8/2

9:36 pm-11:02 pm

Nonstop2h 26m

San Diego

Tue 8/5

6:25 am-10:02 am

Nonstop2h 37m

$139

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 8/6

9:44 am-11:10 am

Nonstop2h 26m

San Diego

Thu 8/14

6:25 am-10:02 am

Nonstop2h 37m

$140

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 8/1

10:29 pm-11:52 pm

Nonstop2h 23m

San Diego

Wed 8/6

6:25 am-10:02 am

Nonstop2h 37m

$141

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 60 results
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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 June 13, 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 June 18, 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 June 15, 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.

Weekly flight availability from Denver to San Diego

Explore weekly flight availability from Denver to San Diego. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 18, 2025.

The most flights from DEN to SAN are scheduled on a Monday (31 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 on average).

Rainfall in San Diego by month

Plan your trip to San Diego by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Diego ranges from 0.0 - 2.3 inches per month. February is typically the wettest month, when rainfall can reach 2.3 in. July is typically the driest time to visit San Diego when rainfall is around 0.0 in.

Temperature in San Diego by month

Plan your trip to San Diego by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Diego, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).

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 June 18, 2025.
To help decide which airline to fly from Denver to San Diego, see what other customers have to say about Alaska Airlines, Southwest and Delta. 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

Comfort

7.8

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,965 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,503 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,809 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 6 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, 107 users have taken a look at flights from Denver Intl to San Diego.

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

    According to our current data, Frontier ($126), and United Airlines ($163) offers the cheapest pricing from Denver to San Diego. Frontier is 34% 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 Southwest, which is currently one of the cheapest options available, starting at $79. Frontier flights start at $80 while deals on United Airlines start at $89 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 United Airlines (83%), Air Canada (80%) and Lufthansa (75%).

  • 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 $3,133, our data indicates the cheapest price to be $69. The most popular route (Denver Intl - San Diego), is priced around $123.

  • 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 Denver?

Book flights to Denver if you plan to visit one of these locations
El Cajon
Chula Vista
National City
Lemon Grove
Imperial Beach
La Mesa
Alpine
Poway
Santee
Coronado

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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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$157FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$157Average$306FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$175Average$287FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$177Average$271FlexibilityNo cancel feeOn-time63%
DeltaCheapest$194Average$333FlexibilityNo cancel feeOn-timeN/A

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