HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Fort Collins

$47+ Cheap flights from San Diego (SAN) to Fort Collins, CO

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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — DEN
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Diego to Fort Collins 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.

Cheapflights Tip: The best prices from San Diego to Fort Collins are usually found in January or February, booked 65 days in advance, depart on a Friday or Thursday and return on a Wednesday

Cheap flight deals from San Diego to Fort Collins

Keep the following information in mind while searching for San Diego to Fort Collins flight deals. Data was last updated October 29, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$76
(eDestinos)

One-way from

$47
(Frontier)

Popular in

March

Cheapest in

January

Average price

$163
Provider with most accurate pricing for San Diego-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Diego-Denver Intl flights.
Search Deals
From San Diego to Fort Collins
Search Deals
One-way flight from San Diego to Fort Collins
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from San Diego to Fort Collins

Cheapest flights from San Diego to Fort Collins
Explore the most affordable flight options available from San Diego to Fort Collins. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

This eDestinos 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1110:57 amSAN - DEN
1 stop6h 11mFrontier
Thu 12/185:43 pmDEN - SAN
Nonstop2h 32mFrontier
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.
Sat 12/204:47 pmSAN - DEN
Nonstop2h 33mFrontier
Wed 12/2410:29 pmDEN - SAN
Nonstop2h 30mFrontier
Deal found 10/27$77
This Frontier deal was found by Cheapflights users on 10/29. 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.
Tue 12/306:25 amSAN - DEN
Nonstop2h 38mFrontier
Tue 1/69:15 pmDEN - SAN
Nonstop2h 31mFrontier
Deal found 10/29$78
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/264:47 pmSAN - DEN
Nonstop2h 33mFrontier
Mon 12/2910:29 pmDEN - SAN
Nonstop2h 30mFrontier
Deal found 10/27$81
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.
Thu 11/139:14 amSAN - DEN
1 stop4h 27mFrontier
Tue 11/1810:35 amDEN - SAN
Nonstop2h 32mFrontier
Deal found 10/27$82
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.
Tue 12/3010:52 amSAN - DEN
1 stop7h 16mFrontier
Thu 1/110:29 pmDEN - SAN
Nonstop2h 30mFrontier
Deal found 10/27$87
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/106:25 amSAN - DEN
1 stop25h 30mFrontier
Thu 12/185:43 pmDEN - SAN
Nonstop2h 32mFrontier
Deal found 10/28$89
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/264:47 pmSAN - DEN
Nonstop2h 33mFrontier
Tue 12/3010:29 pmDEN - SAN
Nonstop2h 30mFrontier
Deal found 10/28$92
This Expedia deal was found by Cheapflights users on 10/28. 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 12/104:02 pmSAN - DEN
Nonstop2h 22mMultiple Airlines
Thu 12/1810:29 pmDEN - SAN
Nonstop2h 30mMultiple Airlines
Deal found 10/28$93
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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.
Tue 11/116:58 amSAN - DEN
Nonstop2h 37mFrontier
Tue 11/188:04 pmDEN - SAN
Nonstop2h 35mFrontier
Deal found 10/28$97
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/248:39 amSAN - DEN
1 stop14h 25mFrontier
Mon 12/16:20 amDEN - SAN
Nonstop2h 41mFrontier
Deal found 10/26$100

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego to Fort Collins 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 29, 2025.
Use the filters below to find and compare flights from San Diego to Fort Collins that are best for you.

Fly from

San Diego

Fly to

Fort Collins

Route

Depart

Return

Price

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Mon 12/29

8:14 pm-11:59 pm

Nonstop2h 45m

Denver Intl

Tue 1/6

12:47 pm-2:40 pm

Nonstop2h 53m

$117

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Wed 2/11

8:10 pm-11:59 pm

Nonstop2h 49m

Denver Intl

Sun 2/15

7:04 pm-8:27 pm

Nonstop2h 23m

$117

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Sun 2/22

3:15 pm-6:33 pm

Nonstop2h 18m

Denver Intl

Thu 2/26

7:04 pm-8:27 pm

Nonstop2h 23m

$117

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Tue 11/18

8:15 am-11:34 am

Nonstop2h 19m

Denver Intl

Sun 11/23

6:00 am-7:34 am

Nonstop2h 34m

$117

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 1/29

10:30 am-3:50 pm

1 stop4h 20m

Denver Intl

Tue 2/3

1:10 pm-4:45 pm

1 stop4h 35m

$127

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Sun 2/22

6:55 am-12:35 pm

1 stop4h 40m

Denver Intl

Thu 2/26

3:40 pm-5:10 pm

Nonstop2h 30m

$127

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 11/20

4:00 pm-9:35 pm

1 stop4h 35m

Denver Intl

Sun 11/23

5:40 am-7:15 am

Nonstop2h 35m

$127

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Tue 12/30

8:50 pm-12:15 am

Nonstop2h 25m

Denver Intl

Sun 1/4

5:40 am-9:00 am

1 stop4h 20m

$127

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 1/1

6:30 am-12:10 pm

1 stop4h 40m

Denver Intl

Sun 1/4

5:40 am-9:00 am

1 stop4h 20m

$132

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Mon 12/29

8:14 pm-11:59 pm

Nonstop2h 45m

Denver Intl

Sat 1/3

6:48 pm-8:28 pm

Nonstop2h 40m

$147

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 22 results
1
2
3

Best time to book a flight from San Diego to Fort Collins

Have a flexible travel schedule? Discover the best time to fly to Fort Collins from San Diego 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 San Diego to Fort Collins

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

Use this chart to determine the optimal time to book a round-trip flight from San Diego to Fort Collins. Price data was last updated on October 24, 2025.

Booking 58 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Diego to Fort Collins. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from San Diego to Fort Collins?

Currently, January is the cheapest month in which you can book a flight from San Diego to Fort Collins (average of $24). Flying from San Diego to Fort Collins in June is currently the most expensive (average of $86). 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 SAN to FC9?

Find hourly flight availability from San Diego to Fort Collins. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 29, 2025.

When flying from San Diego to Fort Collins, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 28% versus a flight at noon.

What is the cheapest day to fly from San Diego to Fort Collins?

Use this chart to determine the cheapest time to fly round-trip from San Diego to Fort Collins. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Diego to Fort Collins flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Fort Collins

Get insights into the airlines that provide service to Fort Collins. 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 Fort Collins. Reviews last updated October 29, 2025.
Read through reviews of airlines operating flights from San Diego to Fort Collins, such as Alaska Airlines, Southwest, and Hawaiian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,206 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,206 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Hawaiian Airlines
7.8
Good
2,794 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
9,001 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,124 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from San Diego to Fort Collins. 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 from for flights from San Diego to Fort Collins?

    San Diego (SAN) is the airport you will fly out of if you book a flight from San Diego to Fort Collins. You should not have trouble finding flights to Fort Collins from San Diego; the airport handles an average of 18 outbound flights to Fort Collins per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the San Diego airport to Fort Collins. It is only a 2.6 mi journey to San Diego (SAN) from San Diego’s city center.

  • How popular is this San Diego to Fort Collins flight route?

    Flights from San Diego to Fort Collins have been viewed 205 times in the past calendar month.

  • How long is the flight from San Diego to Fort Collins?

    Airlines like Alaska Airlines and Southwest fly from San Diego to Fort Collins in about 2h 45m. The time it takes to get you to your destination can typically vary by up to 1h 35m. The distance from San Diego to Fort Collins is about 852 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the most reliable airlines from San Diego to Fort Collins?

    No one likes to see their flight delayed. When booking a flight from San Diego to Fort Collins consider choosing SWISS (93%), Alaska Airlines (91%) or Hawaiian Airlines (91%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from San Diego to Fort Collins?

    Looking at all options, your cheapest flight can be booked for $48. While the most popular route (San Diego - Denver Intl) can be booked for $83 on average, our data indicates $798 when flying from San Diego to Fort Collins.

  • Can I find deals for flights from San Diego to Fort Collins that include hotel bookings?

    Yes. In addition to deals on San Diego to Fort Collins flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Diego to Fort Collins?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Diego to Fort Collins.

  • Can I find deals for business class flights from San Diego to Fort Collins?

    Yes. Cheapflights offers flight deals from San Diego to Fort Collins 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 San Diego to Fort Collins?

    Currently, January is the cheapest month in which you can book a flight from San Diego to Fort Collins (average of $24). Flying from San Diego to Fort Collins in June is currently the most expensive (average of $86). 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

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 San Diego to Fort Collins

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Denver flights
Ontario to Denver flights
San Francisco to Denver flights
Santa Ana to Denver flights
San Diego to Denver flights
Sacramento to Denver flights
Burbank to Denver flights
Las Vegas to Denver flights
San Jose to Denver flights
Reno to Denver flights
Los Angeles to Aspen flights
Palm Springs to Denver flights
Oakland to Denver flights
San Francisco to Aspen flights
Santa Barbara to Denver flights
Fresno to Denver flights
Bakersfield to Denver flights
San Francisco to Vail flights
Los Angeles to Colorado Springs flights
San Luis Obispo to Denver flights
Long Beach to Denver flights
Monterey to Denver flights
Los Angeles to Hayden flights
Ontario to Colorado Springs flights
Los Angeles to Vail flights
Medford to Denver flights
San Francisco to Montrose flights
Arcata to Denver flights
Las Vegas to Colorado Springs flights
San Francisco to Hayden flights
San Francisco to Grand Junction flights
Los Angeles to Grand Junction flights
Santa Rosa to Denver flights
San Diego to Colorado Springs flights
San Francisco to Colorado Springs flights
Los Angeles to Durango flights
Los Angeles to Montrose flights
Ontario to Aspen flights
Redding to Denver flights
San Diego to Hayden flights
Las Vegas to Grand Junction flights
Palm Springs to Colorado Springs flights
Ontario to Durango flights
Las Vegas to Durango flights
Ontario to Grand Junction flights
San Francisco to Durango flights
Sacramento to Colorado Springs flights
Santa Ana to Grand Junction flights
San Jose to Grand Junction flights
Sacramento to Grand Junction flights

Top 5 airlines flying from San Diego to Fort Collins

Discover the top 5 airlines that operate flights from San Diego to Fort Collins. 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 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$159FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$68Average$192FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$101Average$185FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$128Average$264FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$150Average$307FlexibilityNo cancel feeOn-time69%

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.