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$71+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
Jul 11 — Jul 181
Sat 7/11
Sat 7/18
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 June 11, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 6/7. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2410:29 pm
DEN
-
SAN
Nonstop2h 22m
Frontier
Wed 7/296:25 am
SAN
-
DEN
Nonstop2h 38m
Frontier
Deal found 6/7$122
This Frontier deal was found by Cheapflights users on 6/6. 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.
Fri 11/1310:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Sun 11/156:25 am
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 6/6$123
This Frontier deal was found by Cheapflights users on 6/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/287:40 am
DEN
-
SAN
Nonstop2h 25m
Frontier
Tue 8/46:25 am
SAN
-
DEN
Nonstop2h 38m
Frontier
Deal found 6/7$124
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/710:29 pm
DEN
-
SAN
Nonstop2h 22m
Frontier
Sat 8/86:25 am
SAN
-
DEN
Nonstop2h 38m
Frontier
Deal found 6/11$127
This Super.com deal was found by Cheapflights users on 6/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1410:29 pm
DEN
-
SAN
Nonstop2h 22m
Frontier
Tue 8/189:37 am
SAN
-
DEN
Nonstop2h 36m
Frontier
Deal found 6/7$128
This Frontier deal was found by Cheapflights users on 6/9. 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 10/2310:32 pm
DEN
-
SAN
Nonstop2h 27m
Frontier
Mon 10/268:32 pm
SAN
-
DEN
Nonstop2h 34m
Frontier
Deal found 6/9$129
This Cheapflightsfares deal was found by Cheapflights users on 6/9. 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 8/57:45 am
DEN
-
SAN
Nonstop2h 25m
Frontier
Mon 8/106:25 am
SAN
-
DEN
Nonstop2h 38m
Frontier
Deal found 6/9$132
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:13 am
DEN
-
SAN
Nonstop2h 29m
Frontier
Wed 8/264:17 pm
SAN
-
DEN
1 stop4h 29m
Frontier
Deal found 6/11$133
This Cheapflightsfares deal was found by Cheapflights users on 6/9. 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 8/710:29 pm
DEN
-
SAN
Nonstop2h 22m
Frontier
Mon 8/106:25 am
SAN
-
DEN
Nonstop2h 38m
Frontier
Deal found 6/9$134
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 8/259:01 am
DEN
-
SAN
1 stop7h 31m
Frontier
Tue 9/14:17 pm
SAN
-
DEN
1 stop4h 29m
Frontier
Deal found 6/9$135
This Southwest deal was found by Cheapflights users on 6/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:40 pm
COS
-
SAN
1 stop4h 15m
Southwest
Tue 9/87:05 am
SAN
-
COS
1 stop4h 30m
Southwest
Deal found 6/8$180
This Southwest deal was found by Cheapflights users on 6/9. 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.
Tue 7/217:55 pm
COS
-
SAN
1 stop3h 50m
Southwest
Tue 7/286:00 pm
SAN
-
COS
1 stop4h 00m
Southwest
Deal found 6/9$187

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 June 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$122
(Cheapflightsfares)

One-way from

$71
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$257

Good round-trip deal

$199 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. 17% potential increase in price ($38 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 June 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 June 11, 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 8/21

7:55 pm-11:54 pm

1 stop4h 59m

San Diego

Tue 8/25

5:01 pm-10:55 pm

1 stop4h 54m

$207

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Thu 8/6

4:20 pm-10:00 pm

1 stop6h 40m

San Diego

Mon 8/10

5:05 pm-11:35 pm

1 stop5h 30m

$213

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 10/23

6:25 pm-11:47 pm

1 stop6h 22m

San Diego

Mon 10/26

3:59 pm-11:00 pm

1 stop6h 01m

$217

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Tue 8/18

7:20 am-1:00 pm

2 stops6h 40m

San Diego

Thu 8/20

3:20 pm-9:50 pm

1 stop5h 30m

$221

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Wed 9/23

8:00 am-12:30 pm

1 stop5h 30m

San Diego

Sat 9/26

5:02 pm-10:54 pm

1 stop4h 52m

$237

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Thu 8/20

6:16 pm-11:50 pm

1 stop6h 34m

San Diego

Sat 8/22

5:01 pm-10:28 pm

1 stop4h 27m

$247

Grand JunctionSan Diego

GJT - SAN

GJTSAN

Grand Junction Regnl

Fri 7/3

6:50 pm-10:17 pm

1 stop4h 27m

San Diego

Mon 7/6

5:01 pm-9:54 pm

1 stop3h 53m

$271

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Fri 9/25

11:20 am-6:25 pm

2 stops8h 05m

San Diego

Mon 9/28

6:35 am-2:15 pm

2 stops6h 40m

$272

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

Wed 8/26

6:16 pm-11:50 pm

1 stop6h 34m

San Diego

Mon 8/31

5:01 pm-10:28 pm

1 stop4h 27m

$278

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 7/15

3:35 pm-7:00 pm

1 stop4h 25m

San Diego

Tue 7/21

2:40 pm-11:10 pm

2 stops7h 30m

$288

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 $162). Flying from Colorado to San Diego in September is currently the most expensive (average of $405). 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 June 11, 2026.

It’s optimal to fly from Colorado to San Diego in the evening. By choosing this option you can save up to 59% 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 June 11, 2026.

The most flights from USCO to SAN are scheduled on a Wednesday (34 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 on average).

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

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 87 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 June 8, 2026.

Travelers seeking maximum savings on their Colorado to San Diego flight should consider departing on Wednesday 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 124 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?

    Delta, Southwest, and American Airlines can get you from Colorado to San Diego in just under 3h 40m. Your travel time can differ by up to 3h. The distance from Colorado to San Diego is about 655 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 $53 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 Grand Junction Regnl - 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: Hawaiian Airlines (95%), Copa Airlines (89%), Air Canada (89%).

  • 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 $363, our data indicates the cheapest price to be $69. The most popular route (Denver Intl - San Diego), is priced around $131.

  • 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 $162). Flying from Colorado to San Diego in September is currently the most expensive (average of $405). 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
Poway
Coronado
La Mesa
Santee
Julian
Lemon Grove

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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 June 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$49Average$160FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$68Average$169FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$112Average$270FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$116Average$345FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$117Average$340FlexibilityNo cancel feeOn-time63%
DeltaCheapest$211Average$270FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$218Average$347FlexibilityNo cancel feeOn-time71%

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