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$43+ Cheap flights from Colorado to San Diego (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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Cheap flight deals from Colorado to San Diego

Cheapest flights from Colorado to San Diego
Explore the most affordable flight options available from Colorado to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.

This Frontier deal was found by Cheapflights users on 3/6. 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 5/3010:29 pm
DEN
-
SAN
Nonstop2h 26m
Frontier
Thu 6/46:25 am
SAN
-
DEN
Nonstop2h 44m
Frontier
Deal found 3/6$68
This Cheapflightsfares deal was found by Cheapflights users on 3/5. 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.
Thu 4/307:00 am
DEN
-
SAN
Nonstop2h 34m
Frontier
Sun 5/36:25 am
SAN
-
DEN
Nonstop2h 37m
Frontier
Deal found 3/5$69
This Frontier deal was found by Cheapflights users on 3/6. 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 4/96:15 am
DEN
-
SAN
Nonstop2h 37m
Frontier
Fri 4/109:28 pm
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 3/6$72
This Frontier deal was found by Cheapflights users on 3/5. 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 4/259:30 pm
DEN
-
SAN
Nonstop2h 36m
Frontier
Mon 4/276:25 am
SAN
-
DEN
Nonstop2h 37m
Frontier
Deal found 3/5$73
This Kiwi.com deal was found by Cheapflights users on 3/10. 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.
Sat 4/259:30 pm
DEN
-
SAN
Nonstop2h 36m
Frontier
Fri 5/16:25 am
SAN
-
DEN
Nonstop2h 37m
Frontier
Deal found 3/10$77
This Cheapflightsfares deal was found by Cheapflights users on 3/6. 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 5/2210:29 pm
DEN
-
SAN
Nonstop2h 26m
Frontier
Mon 5/256:25 am
SAN
-
DEN
Nonstop2h 44m
Frontier
Deal found 3/6$78
This Kiwi.com deal was found by Cheapflights users on 3/7. 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.
Sun 5/177:00 am
DEN
-
SAN
Nonstop2h 34m
Frontier
Fri 5/2211:16 am
SAN
-
DEN
Nonstop2h 49m
Frontier
Deal found 3/7$81
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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.
Mon 5/1810:29 pm
DEN
-
SAN
Nonstop2h 32m
Frontier
Fri 5/2211:16 am
SAN
-
DEN
Nonstop2h 49m
Frontier
Deal found 3/10$82
This Super.com deal was found by Cheapflights users on 3/8. 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.
Sun 3/2910:29 pm
DEN
-
SAN
Nonstop2h 39m
Frontier
Fri 4/39:28 pm
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 3/8$83
This Trip.com deal was found by Cheapflights users on 3/5. 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.
Wed 3/2510:29 pm
DEN
-
SAN
Nonstop2h 39m
Multiple Airlines
Wed 4/18:05 pm
SAN
-
DEN
Nonstop2h 39m
Multiple Airlines
Deal found 3/5$84
This Cheapflightsfares deal was found by Cheapflights users on 3/5. 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 4/116:52 pm
DEN
-
SAN
Nonstop2h 34m
Frontier
Sun 4/129:28 pm
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 3/5$86
This Southwest deal was found by Cheapflights users on 3/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/22:40 pm
COS
-
SAN
Nonstop2h 35m
Southwest
Mon 4/65:00 pm
SAN
-
COS
Nonstop2h 15m
Southwest
Deal found 3/7$157

Find flight deals from Colorado to San Diego

Keep the following information in mind while searching for Colorado to San Diego flight deals. Data was last updated March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$68
(Frontier)

One-way from

$43
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$207

Good round-trip deal

$126 or less

Good one-way deal

$83 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 Colorado to San Diego
Search Deals
One-way flight from Colorado to San Diego
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($23 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 March 2026
Search Deals
Price to beat on a round-trip flight from Colorado to San Diego.
Search Deals
Price to beat on a one-way flight from Colorado to San Diego.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado 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 March 10, 2026.
Use the filters below to find and compare flights from Colorado to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 5/1

1:02 pm-2:38 pm

Nonstop2h 36m

San Diego

Sat 5/2

2:54 pm-6:25 pm

Nonstop2h 31m

$117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 5/14

8:10 pm-11:05 pm

1 stop3h 55m

San Diego

Mon 5/18

6:55 pm-12:25 am

1 stop4h 30m

$137

DurangoSan Diego

DRO - SAN

DROSAN

Durango La Plata County

Sat 3/21

6:37 pm-9:39 pm

1 stop4h 02m

San Diego

Wed 3/25

6:24 am-11:04 am

1 stop3h 40m

$220

Grand JunctionSan Diego

GJT - SAN

GJTSAN

Grand Junction Regnl

Fri 4/17

3:40 pm-10:30 pm

1 stop7h 50m

San Diego

Sun 4/19

6:32 am-12:38 pm

1 stop5h 06m

$231

MontroseSan Diego

MTJ - SAN

MTJSAN

Montrose County

Sat 3/21

4:04 pm-8:53 pm

1 stop5h 49m

San Diego

Thu 3/26

6:15 am-1:29 pm

1 stop6h 14m

$231

MontroseSan Diego

MTJ - SAN

MTJSAN

Montrose County

Wed 3/25

1:42 pm-5:26 pm

1 stop4h 44m

San Diego

Sun 3/29

6:20 am-1:27 pm

1 stop6h 07m

$231

MontroseSan Diego

MTJ - SAN

MTJSAN

Montrose County

Sat 3/21

2:10 pm-7:48 pm

1 stop6h 38m

San Diego

Fri 3/27

6:15 am-1:29 pm

1 stop6h 14m

$231

GunnisonSan Diego

GUC - SAN

GUCSAN

Gunnison

Tue 5/19

1:36 pm-5:19 pm

1 stop4h 43m

San Diego

Mon 5/25

6:35 am-2:39 pm

1 stop7h 04m

$231

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 5/30

3:49 pm-9:55 pm

1 stop7h 06m

San Diego

Fri 6/5

5:01 pm-10:41 pm

1 stop4h 40m

$237
Quickest round-trip

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Mon 4/6

2:40 pm-4:15 pm

Nonstop2h 35m

San Diego

Fri 4/10

4:10 pm-7:25 pm

Nonstop2h 15m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from Colorado to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Colorado 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 Colorado to San Diego

What is the cheapest month to book a flight from Colorado to San Diego?

Currently, February is the cheapest month in which you can book a flight from Colorado to San Diego (average of $38). Flying from Colorado to San Diego in September is currently the most expensive (average of $74). 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 CO to SAN?

Find hourly flight availability from Colorado 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 March 10, 2026.

It’s optimal to fly from Colorado to San Diego in the evening. By choosing this option you can save up to 57% on the cost of your flight, compared to a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Colorado to San Diego. Price data was last updated on February 21, 2026.

Travelers seeking maximum savings on their Colorado 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.

Weekly flight availability from Colorado to San Diego

Explore weekly flight availability from Colorado 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 March 10, 2026.

The most flights from USCO to SAN are scheduled on a Tuesday (32 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (13 on average).

Related info for your journey

Find useful and relevant information for your journey from Colorado 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 airport do you fly into for flights to San Diego from Colorado?

    San Diego (SAN), located 2.6 mi from the city center, is the airport you fly into when you book flights from Colorado to San Diego.

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

    This flight path from Colorado to San Diego was viewed by 94 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Alaska Airlines, Southwest, and American Airlines can get you from Colorado to San Diego in just under 2h 36m. Your travel time can differ by up to 1h 26m. The distance from Colorado to San Diego is about 852 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Colorado 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 $30. Hawaiian Airlines flights start at $45 while deals on Alaska Airlines start at $48 one-way.

  • What are the most popular routes from Colorado to San Diego?

    While some choose either Colorado Springs - San Diego or Vail Eagle County - San Diego, Denver Intl - San Diego is the most popular route from Colorado to San Diego.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Colorado to San Diego on time: SkyWest Airlines (97%), Alaska Airlines (90%), Hawaiian Airlines (87%).

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

    Looking for the cheapest flight from Colorado to San Diego? While on average our users pay $511, our data indicates the cheapest price to be $28. The most popular route (Denver Intl - San Diego), is priced around $59.

  • Can I find deals for flights from Colorado to San Diego that include hotel bookings?

    Yes. In addition to deals on Colorado to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to San Diego.

  • Can I find deals for business class flights from Colorado to San Diego?

    Yes. Cheapflights offers flight deals from Colorado 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 Colorado to San Diego?

    Currently, February is the cheapest month in which you can book a flight from Colorado to San Diego (average of $38). Flying from Colorado to San Diego in September is currently the most expensive (average of $74). 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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Top 7 airlines flying from Colorado to San Diego

Discover the top 7 airlines that operate flights from Colorado 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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$51Average$164FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$68Average$177FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$99Average$267FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$116Average$347FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$117Average$299FlexibilityNo cancel feeOn-time63%
DeltaCheapest$211Average$249FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$216Average$365FlexibilityNo cancel feeOn-time71%

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