HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$51+ 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 12/30. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 October 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/510:29 pmDEN - SAN
Nonstop2h 30mFrontier
Sun 12/76:34 amSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/27$71
This Frontier deal was found by Cheapflights users on 10/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:29 pmDEN - SAN
Nonstop2h 30mFrontier
Tue 12/306:25 amSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/26$74
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2010:29 pmDEN - SAN
Nonstop2h 30mFrontier
Tue 12/306:25 amSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/27$76
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2710:29 pmDEN - SAN
Nonstop2h 30mFrontier
Tue 12/26:25 amSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/27$77
This Frontier deal was found by Cheapflights users on 10/27. 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 12/295:43 pmDEN - SAN
Nonstop2h 32mFrontier
Tue 1/67:15 amSAN - DEN
Nonstop2h 36mFrontier
Deal found 10/27$78
This Frontier deal was found by Cheapflights users on 10/25. 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.
Thu 12/46:00 amDEN - SAN
1 stop5h 02mFrontier
Fri 12/126:34 amSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/25$82
This Gotogate deal was found by Cheapflights users on 10/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2010:29 pmDEN - SAN
1 stop21h 07mFrontier
Mon 11/246:36 amSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/27$83
This Mytrip deal was found by Cheapflights users on 10/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/16:20 amDEN - SAN
Nonstop2h 41mFrontier
Thu 12/410:57 amSAN - DEN
1 stop6h 11mFrontier
Deal found 10/27$84
This Booking.com deal was found by Cheapflights users on 10/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2010:29 pmDEN - SAN
1 stop21h 07mFrontier
Sun 11/237:31 pmSAN - DEN
Nonstop2h 37mFrontier
Deal found 10/27$85
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:29 pmDEN - SAN
Nonstop2h 30mFrontier
Fri 1/24:47 pmSAN - DEN
Nonstop2h 33mFrontier
Deal found 10/27$86
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
Tue 12/2310:29 pmDEN - SAN
Nonstop2h 30mFrontier
Mon 12/292:10 pmSAN - DEN
1 stop9h 15mFrontier
Deal found 10/25$87
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:15 amDEN - SAN
1 stop4h 42mFrontier
Tue 1/61:18 pmSAN - DEN
Nonstop2h 38mFrontier
Deal found 10/27$90

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 October 28, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$62
(Kiwi.com)

One-way from

$51
(Priceline)

Popular in

March

Cheapest in

February

Average price

$167

Good round-trip deal

$119 or less

Good one-way deal

$99 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 October 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 October 28, 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

Tue 12/23

6:00 am-7:51 am

Nonstop2h 51m

San Diego

Tue 12/30

8:14 pm-11:59 pm

Nonstop2h 45m

$117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 12/12

2:10 pm-5:25 pm

1 stop4h 15m

San Diego

Sun 12/14

8:35 am-1:30 pm

1 stop3h 55m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 12/4

1:30 pm-4:55 pm

1 stop4h 25m

San Diego

Sun 12/7

8:35 am-1:30 pm

1 stop3h 55m

$127

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 12/29

3:35 pm-6:55 pm

1 stop4h 20m

San Diego

Fri 1/2

7:40 pm-1:40 am

1 stop5h 00m

$132

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 1/16

4:30 pm-7:35 pm

1 stop4h 05m

San Diego

Mon 1/19

5:30 pm-10:55 pm

1 stop4h 25m

$132

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 12/24

1:10 pm-4:50 pm

1 stop4h 40m

San Diego

Fri 1/2

7:40 pm-1:40 am

1 stop5h 00m

$136

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 12/6

1:05 pm-5:25 pm

2 stops5h 20m

San Diego

Tue 12/9

10:20 am-3:55 pm

1 stop4h 35m

$137

DurangoSan Diego

DRO - SAN

DROSAN

Durango La Plata County

Sun 11/16

3:18 pm-8:54 pm

1 stop6h 36m

San Diego

Sun 11/23

6:45 am-12:36 pm

1 stop4h 51m

$200

DurangoSan Diego

DRO - SAN

DROSAN

Durango La Plata County

Mon 11/10

11:56 am-3:19 pm

1 stop4h 23m

San Diego

Fri 11/14

6:30 am-11:49 am

1 stop4h 19m

$200

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 11/1

3:08 pm-9:24 pm

1 stop7h 16m

San Diego

Tue 11/4

8:00 am-3:19 pm

1 stop6h 19m

$202

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 60 results
1
2
3
...
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, 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 October 28, 2025.

It’s optimal to fly from Colorado to San Diego in the evening. By choosing this option you can save up to 35% 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 Friday mornings 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.

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 72 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 United Airlines can get you from Colorado to San Diego in just under 2h 51m. Your travel time can differ by up to 3h 45m. 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 $55. Southwest flights start at $59 while deals on United Airlines start at $59 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: Frontier (81%), Air Canada (78%), United Airlines (74%).

  • 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 $924, our data indicates the cheapest price to be $43. The most popular route (Denver Intl - San Diego), is priced around $53.

  • 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
National City

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Colorado to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
John F Kennedy Intl to San Francisco flights
San Francisco to Los Angeles flights
Newark to Los Angeles flights
Newark to Las Vegas flights
Seattle to Los Angeles flights
Newark to San Francisco flights
San Francisco to Las Vegas flights
Seattle to Las Vegas flights
Los Angeles to San Francisco flights
Dallas/Fort Worth to Los Angeles flights
LaGuardia to Los Angeles flights
Atlanta to Las Vegas flights
Dulles Intl to Las Vegas flights
O'Hare Intl to Las Vegas flights
Boston to Las Vegas flights
Denver to Las Vegas flights
Minneapolis to Las Vegas flights
Seattle to Santa Ana flights
O'Hare Intl to Los Angeles flights
LaGuardia to Las Vegas flights
Seattle to San Diego flights
Boston to Los Angeles flights
Los Angeles to Las Vegas flights
Portland to Los Angeles flights
Seattle to Ontario flights
Dallas/Fort Worth to San Francisco flights
LaGuardia to San Francisco flights
Baltimore to Las Vegas flights
Atlanta to Los Angeles flights
Reagan-National to Los Angeles flights
San Francisco to Santa Ana flights
San Jose to Las Vegas flights
Dulles Intl to Los Angeles flights
Hobby to Las Vegas flights
O'Hare Intl to San Francisco flights
Reagan-National to Las Vegas flights
San Francisco to Ontario flights
Cleveland to Las Vegas flights
Burbank to Las Vegas flights
Dallas/Fort Worth to Ontario flights
Baltimore to Los Angeles flights
John F Kennedy Intl to San Diego flights
Ontario to San Francisco flights
Santa Ana to San Francisco flights
Santa Ana to Las Vegas flights
Orlando to Las Vegas flights
Detroit to Las Vegas flights

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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$62Average$169FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$168FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$117Average$331FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$133Average$352FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$140Average$387FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$288FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$228Average$369FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.