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$44+ 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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
Jan 13 — Jan 201
Tue 1/13
Tue 1/20
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 December 14, 2025.

This Frontier deal was found by Cheapflights users on 12/12. 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.
Wed 12/316:15 amDEN - SAN
1 stop4h 42mFrontier
Wed 1/77:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/12$111
This eDestinos deal was found by Cheapflights users on 12/12. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:15 amDEN - SAN
1 stop8h 00mFrontier
Tue 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/12$128
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.
Wed 12/316:15 amDEN - SAN
1 stop4h 42mFrontier
Mon 1/52:10 pmSAN - DEN
1 stop18h 52mFrontier
Deal found 12/13$152
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:43 pmDEN - SAN
Nonstop2h 32mFrontier
Tue 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/13$158
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.
Tue 12/306:15 amDEN - SAN
1 stop4h 42mFrontier
Tue 1/67:00 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 12/14$160
This Super.com deal was found by Cheapflights users on 12/11. 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.
Mon 12/159:00 amDEN - SAN
1 stop6h 10mFrontier
Fri 1/166:25 amSAN - DEN
Nonstop2h 35mFrontier
Deal found 12/11$161
This Expedia deal was found by Cheapflights users on 12/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:29 pmDEN - SAN
1 stop22h 55mFrontier
Mon 12/292:10 pmSAN - DEN
1 stop9h 15mFrontier
Deal found 12/12$162
This Frontier deal was found by Cheapflights users on 12/11. 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.
Mon 12/296:15 amDEN - SAN
1 stop8h 00mFrontier
Mon 1/54:47 pmSAN - DEN
Nonstop2h 33mFrontier
Deal found 12/11$173
This United Airlines deal was found by Cheapflights users on 12/12. 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.
Sat 12/2010:42 amDRO - SAN
1 stop7h 52mUnited Airlines
Wed 12/319:00 amSAN - DRO
1 stop7h 20mUnited Airlines
Deal found 12/12$240
This American Airlines deal was found by Cheapflights users on 12/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2612:41 pmEGE - SAN
1 stop6h 56mAmerican Airlines
Thu 1/19:50 amSAN - EGE
1 stop4h 26mAmerican Airlines
Deal found 12/12$269
This United Airlines deal was found by Cheapflights users on 12/12. 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.
Wed 12/3111:42 amDRO - SAN
1 stop6h 52mUnited Airlines
Sun 1/46:30 amSAN - DRO
1 stop4h 58mUnited Airlines
Deal found 12/12$297
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Tue 12/232:13 pmMTJ - SAN
1 stop6h 44mUnited Airlines
Fri 1/26:30 amSAN - MTJ
1 stop4h 56mUnited Airlines
Deal found 12/11$305

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 December 14, 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 Colorado to San Diego
Search Deals
One-way flight from Colorado 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 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 December 14, 2025.
Use the filters below to find and compare flights from Colorado to San Diego that are best for you.

Fly from

Colorado

Fly to

San Diego

Route

Depart

Return

Price

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 1/4

6:00 am-7:51 am

Nonstop2h 51m

San Diego

Tue 1/6

8:15 am-12:07 pm

Nonstop2h 52m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 1/12

1:37 pm-3:04 pm

Nonstop2h 27m

San Diego

Wed 1/14

11:10 am-2:41 pm

Nonstop2h 31m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 1/2

6:00 am-7:51 am

Nonstop2h 51m

San Diego

Tue 1/6

3:44 pm-7:18 pm

Nonstop2h 34m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 1/10

3:56 pm-5:28 pm

Nonstop2h 32m

San Diego

Mon 1/12

4:10 pm-7:40 pm

Nonstop2h 30m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 2/20

7:35 pm-11:40 pm

1 stop5h 05m

San Diego

Mon 2/23

6:30 am-9:58 am

Nonstop2h 28m

$167

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 3/6

12:50 pm-3:55 pm

1 stop4h 05m

San Diego

Sat 3/7

6:15 am-12:00 pm

1 stop4h 45m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 2/6

1:10 pm-7:08 pm

1 stop6h 58m

San Diego

Mon 2/9

2:55 pm-11:21 pm

1 stop7h 26m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 1/12

12:49 pm-4:36 pm

1 stop4h 47m

San Diego

Fri 1/16

4:20 pm-11:11 pm

1 stop5h 51m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 1/16

3:48 pm-7:54 pm

1 stop5h 06m

San Diego

Sat 1/17

11:08 am-4:32 pm

1 stop4h 24m

$197

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 2/27

7:35 pm-11:40 pm

1 stop5h 05m

San Diego

Sun 3/1

6:15 am-2:34 pm

1 stop7h 19m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Showing 1-10 of 60 results
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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, January 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 $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 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 December 14, 2025.

It’s optimal to fly from Colorado to San Diego in the evening. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight at noon.

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 December 16, 2024.

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 December 14, 2025.

The most flights from USCO to SAN are scheduled on a Friday (33 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (11 on average).

How much does it cost to fly round-trip from Colorado to San Diego?

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 82 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, United Airlines, and American Airlines can get you from Colorado to San Diego in just under 2h 27m. Your travel time can differ by up to 1h 27m. 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 $39. Alaska Airlines flights start at $58 while deals on Southwest start at $68 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: Frontier (84%), Lufthansa (82%), United Airlines (80%).

  • 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 $269, our data indicates the cheapest price to be $29. The most popular route (Denver Intl - San Diego), is priced around $88.

  • 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, January 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 $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
La Mesa
Poway
Lemon Grove
Julian
National City

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Alternative routes for Colorado to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$156FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$168FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$117Average$328FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$118Average$343FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$127Average$382FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$288FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$228Average$364FlexibilityNo cancel feeOn-time71%

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