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San Diego

$79+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
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 July 27, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/26. 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.
Thu 9/102:29 pm
DEN
-
SAN
Nonstop2h 30m
Frontier
Mon 9/149:03 pm
SAN
-
DEN
1 stop12h 04m
Frontier
Deal found 7/26$128
This Kiwi.com deal was found by Cheapflights users on 7/26. 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.
Thu 10/17:30 am
DEN
-
SAN
1 stop13h 47m
Frontier
Tue 10/66:25 am
SAN
-
DEN
Nonstop2h 34m
Frontier
Deal found 7/26$129
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 9/2610:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Wed 9/309:57 am
SAN
-
DEN
1 stop4h 41m
Frontier
Deal found 7/23$130
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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 8/197:40 am
DEN
-
SAN
Nonstop2h 25m
Frontier
Wed 8/266:25 am
SAN
-
DEN
Nonstop2h 38m
Frontier
Deal found 7/22$131
This Frontier deal was found by Cheapflights users on 7/23. 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 8/1910:29 pm
DEN
-
SAN
Nonstop2h 22m
Frontier
Sat 8/223:45 pm
SAN
-
DEN
Nonstop2h 35m
Frontier
Deal found 7/23$133
This Cheapflightsfares deal was found by Cheapflights users on 7/27. 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.
Thu 10/810:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Mon 10/126:25 am
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 7/27$134
This Cheapflightsfares deal was found by Cheapflights users on 7/25. 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 11/1210:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Sat 11/148:32 pm
SAN
-
DEN
Nonstop2h 34m
Frontier
Deal found 7/25$135
This Frontier deal was found by Cheapflights users on 7/27. 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.
Mon 11/1610:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Thu 11/198:32 pm
SAN
-
DEN
Nonstop2h 34m
Frontier
Deal found 7/27$136
This Frontier deal was found by Cheapflights users on 7/25. 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 10/910:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Wed 10/148:32 pm
SAN
-
DEN
Nonstop2h 34m
Frontier
Deal found 7/25$137
This Kiwi.com deal was found by Cheapflights users on 7/25. 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.
Thu 8/2012:47 pm
DEN
-
SAN
1 stop8h 17m
Frontier
Mon 8/248:59 pm
SAN
-
DEN
1 stop5h 49m
Frontier
Deal found 7/25$138
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Thu 8/209:15 am
DEN
-
SAN
1 stop15h 29m
Frontier
Thu 8/273:45 pm
SAN
-
DEN
Nonstop2h 35m
Frontier
Deal found 7/24$139
This Southwest deal was found by Cheapflights users on 7/22. 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 9/102:15 pm
COS
-
SAN
Nonstop2h 20m
Southwest
Mon 9/141:10 pm
SAN
-
COS
Nonstop2h 20m
Southwest
Deal found 7/22$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 July 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$128
(Kiwi.com)

One-way from

$79
(Southwest)

Popular in

June

Cheapest in

February

Average price

$263

Good round-trip deal

$172 or less

Good one-way deal

$131 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. 21% potential increase in price ($52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 27, 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

Wed 10/7

6:35 am-8:05 am

Nonstop2h 30m

San Diego

Tue 10/13

3:20 pm-6:35 pm

Nonstop2h 15m

$177

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Thu 8/20

5:30 am-9:35 am

1 stop5h 05m

San Diego

Tue 8/25

11:40 am-7:05 pm

2 stops6h 25m

$182

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 9/5

1:45 pm-5:15 pm

1 stop4h 30m

San Diego

Wed 9/9

12:20 pm-5:15 pm

1 stop3h 55m

$192

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 9/10

5:20 pm-6:45 pm

Nonstop2h 25m

San Diego

Mon 9/14

2:55 pm-6:15 pm

Nonstop2h 20m

$197
Quickest round-trip

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Mon 9/14

2:15 pm-3:35 pm

Nonstop2h 20m

San Diego

Fri 9/18

1:10 pm-4:30 pm

Nonstop2h 20m

$207

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 8/22

7:05 am-12:08 pm

1 stop6h 03m

San Diego

Sun 8/23

6:29 am-12:04 pm

1 stop4h 35m

$208

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 10/11

6:35 am-10:17 am

1 stop4h 42m

San Diego

Thu 10/15

10:57 am-6:09 pm

1 stop6h 12m

$217

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 10/2

8:50 am-12:15 pm

1 stop4h 25m

San Diego

Mon 10/5

7:15 pm-12:45 am

1 stop4h 30m

$217

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Fri 9/18

4:20 pm-9:15 pm

2 stops5h 55m

San Diego

Mon 9/21

4:45 pm-9:55 pm

1 stop4h 10m

$222

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 9/26

1:35 pm-6:55 pm

2 stops6h 20m

San Diego

Sat 10/3

3:35 pm-9:30 pm

1 stop4h 55m

$238

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

Showing 1-10 of 60 resultsSorted by cheapest first
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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, February is the cheapest month in which you can book a flight from Colorado to San Diego (average of $147). Flying from Colorado to San Diego in June is currently the most expensive (average of $284). 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 July 27, 2026.

It’s optimal to fly from Colorado to San Diego in the evening. By choosing this option you can save up to 58% on the cost of your flight, compared to a flight at noon.

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 July 27, 2026.

The most flights from USCO to SAN are scheduled on a Monday (30 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (18 on average).

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

Airfare is below average for this route at the moment.
Colorado to San Diego flights typically cost between $158 and $267 in September.
The cheapest round-trip price found within the last 5 days was $128 on Frontier (Sep 10-Sep 14).

How far ahead should I book a flight from Colorado to San Diego?

To ensure you get the cheapest price possible for a flight from Colorado to San Diego, you should look to book at least 80 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 July 25, 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.

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 132 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?

    Southwest, Delta, and American Airlines can get you from Colorado to San Diego in just under 2h 30m. Your travel time can differ by up to 3h 33m. 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 $28. Alaska Airlines flights start at $55 while deals on Southwest start at $58 one-way.

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

    While some choose either Colorado Springs - San Diego or Durango La Plata 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: Volaris (78%), Alaska Airlines (75%), Frontier (73%).

  • 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 $654, our data indicates the cheapest price to be $53. 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, February is the cheapest month in which you can book a flight from Colorado to San Diego (average of $147). Flying from Colorado to San Diego in June is currently the most expensive (average of $284). 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
National City
Chula Vista
Poway
La Mesa
Coronado
Santee
San Ysidro
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 July 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$47Average$150FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$68Average$167FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$115Average$352FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$115Average$276FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$117Average$302FlexibilityNo cancel feeOn-time63%
DeltaCheapest$211Average$270FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$218Average$348FlexibilityNo cancel feeOn-time71%

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