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$78+ 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 11/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
ago. 5 — ago. 121
mar. 8/5
mar. 8/12
1 adult, Economy
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Cheap 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 julio 31, 2025.

Round-trip from

$123
(Frontier)

One-way from

$79
(Southwest)

Popular in

March

Cheapest in

September

Average price

$211

Good round-trip deal

$159 or less

Good one-way deal

$110 or less
From Colorado to San Diego
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One-way flight from Colorado to San Diego
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Highest demand for flights based on searches. 2% potential increase in price ($4 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Colorado to San Diego.
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Price to beat on a one-way flight from Colorado to San Diego.
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Find 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 julio 31, 2025.

This Frontier deal was found by Cheapflights users on 7/29. 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.
vie. 9/1210:29 pmDEN - SAN
Nonstop2h 24mFrontier
vie. 9/196:35 amSAN - DEN
Nonstop2h 33mFrontier
Deal found 7/29$123
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/183:00 pmDEN - SAN
Nonstop2h 23mAlaska Airlines
sáb. 10/188:19 pmSAN - DEN
Nonstop2h 28mAlaska Airlines
Deal found 7/30$131
This Southwest deal was found by Cheapflights users on 7/31. 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.
mié. 10/159:55 pmDEN - SAN
Nonstop2h 25mSouthwest
mié. 10/2210:15 amSAN - DEN
1 stop4h 45mSouthwest
Deal found 7/31$143
This American Airlines deal was found by Cheapflights users on 7/30. 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.
sáb. 9/203:07 pmDEN - SAN
1 stop5h 17mAmerican Airlines
mar. 9/236:20 amSAN - DEN
1 stop7h 07mAmerican Airlines
Deal found 7/30$159
This Trip.com deal was found by Cheapflights users on 7/29. 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.
sáb. 8/234:08 pmDEN - SAN
Nonstop2h 21mMultiple Airlines
dom. 8/246:29 amSAN - DEN
Nonstop2h 37mMultiple Airlines
Deal found 7/29$161
This Southwest deal was found by Cheapflights users on 7/31. 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.
jue. 11/610:05 amCOS - SAN
Nonstop2h 25mSouthwest
lun. 11/1011:10 amSAN - COS
Nonstop2h 25mSouthwest
Deal found 7/31$177
This United Airlines deal was found by Cheapflights users on 7/30. 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.
mié. 9/35:30 amCOS - SAN
1 stop4h 39mUnited Airlines
mié. 9/34:03 pmSAN - COS
1 stop6h 47mUnited Airlines
Deal found 7/30$187
This American Airlines deal was found by Cheapflights users on 7/30. 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.
jue. 11/134:37 pmCOS - SAN
1 stop8h 19mAmerican Airlines
mar. 11/188:25 amSAN - COS
1 stop8h 09mAmerican Airlines
Deal found 7/30$197
This American Airlines deal was found by Cheapflights users on 7/29. 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.
vie. 9/196:02 amGJT - SAN
1 stop3h 51mAmerican Airlines
mar. 9/236:20 amSAN - GJT
1 stop3h 56mAmerican Airlines
Deal found 7/29$211
This Delta deal was found by Cheapflights users on 7/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/135:55 pmCOS - SAN
1 stop6h 50mDelta
mar. 11/186:15 amSAN - COS
2 stops9h 58mDelta
Deal found 7/29$217
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/195:56 amGJT - SAN
1 stop4h 08mDelta
dom. 11/236:15 amSAN - GJT
1 stop5h 15mDelta
Deal found 7/30$223
This United Airlines deal was found by Cheapflights users on 7/30. 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.
vie. 8/156:15 pmASE - SAN
1 stop4h 59mUnited Airlines
mar. 8/191:58 pmSAN - ASE
1 stop4h 45mUnited Airlines
Deal found 7/30$249

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 julio 31, 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

vie. 9/12

9:38 am-11:09 am

Nonstop2h 31m

San Diego

vie. 9/19

6:35 am-10:08 am

Nonstop2h 33m

$123

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

sáb. 10/18

3:00 pm-4:23 pm

Nonstop2h 23m

San Diego

sáb. 10/18

8:19 pm-11:47 pm

Nonstop2h 28m

$131

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

mié. 10/15

9:55 pm-11:20 pm

Nonstop2h 25m

San Diego

mié. 10/22

10:15 am-4:00 pm

1 stop4h 45m

$143

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

sáb. 9/20

3:07 pm-7:24 pm

1 stop5h 17m

San Diego

mar. 9/23

6:20 am-2:27 pm

1 stop7h 07m

$159

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

sáb. 8/23

4:08 pm-5:29 pm

Nonstop2h 21m

San Diego

dom. 8/24

6:29 am-10:06 am

Nonstop2h 37m

$161

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

mié. 9/3

5:30 am-9:09 am

1 stop4h 39m

San Diego

mié. 9/3

4:03 pm-11:50 pm

1 stop6h 47m

$187

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

vie. 8/29

5:09 pm-11:52 pm

1 stop7h 43m

San Diego

dom. 8/31

12:50 pm-11:44 pm

2 stops9h 54m

$202

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

mié. 8/27

4:15 pm-9:50 pm

2 stops6h 35m

San Diego

mié. 9/3

2:20 pm-10:00 pm

2 stops6h 40m

$207

Grand JunctionSan Diego

GJT - SAN

GJTSAN

Grand Junction Regnl

vie. 9/19

6:02 am-8:53 am

1 stop3h 51m

San Diego

mar. 9/23

6:20 am-11:16 am

1 stop3h 56m

$211

Colorado SpringsSan Diego

COS - SAN

COSSAN

Colorado Springs

sáb. 8/30

5:55 pm-10:39 pm

1 stop5h 44m

San Diego

mar. 9/2

5:00 pm-10:18 pm

1 stop4h 18m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 46 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, August is the cheapest month in which you can book a flight from Colorado to San Diego (average of $286). Flying from Colorado 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 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 julio 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to San Diego as you normally would.

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 julio 31, 2025.

The most flights from USCO to SAN are scheduled on a Thursday (29 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 on average).

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 julio 31, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Colorado to San Diego. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

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

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

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
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

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 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 89 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Colorado 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 American Airlines start at $89 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: United Airlines (73%), Air Canada (72%), Lufthansa (67%).

  • 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 $354, our data indicates the cheapest price to be $68. The most popular route (Denver Intl - San Diego), is priced around $87.

  • 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, August is the cheapest month in which you can book a flight from Colorado to San Diego (average of $286). Flying from Colorado 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 San Diego?

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

Browse thousands of different options on Cheapflights for your next trip

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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 julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$167FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$137Average$185FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$147Average$336FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$157Average$344FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$158Average$418FlexibilityNo cancel feeOn-time69%
DeltaCheapest$194Average$337FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$207Average$369FlexibilityNo cancel feeOn-time71%

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