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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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — DEN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from San Diego to Fort Collins are usually found in January or October, booked 58 days in advance, depart on a Saturday or Friday and return on a Tuesday

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 September 11, 2025.

Round-trip from

$83
(Trip.com)

One-way from

$47
(Southwest)

Popular in

March

Cheapest in

January

Average price

$158
From San Diego to Fort Collins
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One-way flight from San Diego to Fort Collins
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Highest demand for flights based on searches. 4% potential increase in price ($9 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 11, 2025.

This Trip.com deal was found by Cheapflights users on 9/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/112:24 pmSAN - DEN
Nonstop2h 33mFrontier
Tue 10/1410:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/11$83
This Southwest deal was found by Cheapflights users on 9/10. 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 10/148:15 pmSAN - DEN
Nonstop2h 35mSouthwest
Wed 10/294:55 pmDEN - SAN
1 stop4h 00mSouthwest
Deal found 9/10$84
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 11/146:41 amSAN - DEN
Nonstop2h 37mFrontier
Sun 11/1610:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/10$87
This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/49:30 amSAN - DEN
Nonstop2h 25mSouthwest
Wed 10/88:10 amDEN - SAN
1 stop4h 45mSouthwest
Deal found 9/11$88
This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/58:40 amSAN - DEN
1 stop3h 55mSouthwest
Tue 11/112:20 pmDEN - SAN
1 stop4h 35mSouthwest
Deal found 9/11$89
This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:50 pmSAN - DEN
Nonstop2h 25mSouthwest
Thu 10/239:40 pmDEN - SAN
Nonstop2h 25mSouthwest
Deal found 9/11$90
This Southwest deal was found by Cheapflights users on 9/10. 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.
Sat 10/49:30 amSAN - DEN
Nonstop2h 25mSouthwest
Sat 10/183:20 pmDEN - SAN
1 stop5h 35mSouthwest
Deal found 9/10$92
This Orbitz deal was found by Cheapflights users on 9/9. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/146:41 amSAN - DEN
Nonstop2h 37mMultiple Airlines
Wed 10/157:50 pmDEN - SAN
Nonstop2h 29mMultiple Airlines
Deal found 9/9$94
This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1710:30 amSAN - DEN
1 stop4h 25mSouthwest
Wed 11/193:55 pmDEN - SAN
Nonstop2h 25mSouthwest
Deal found 9/11$95
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 10/96:41 amSAN - DEN
Nonstop2h 37mFrontier
Mon 10/1310:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/10$96
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 9/237:15 amSAN - DEN
Nonstop2h 35mFrontier
Tue 10/710:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/10$97

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 September 11, 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

Wed 11/5

4:50 pm-9:35 pm

1 stop3h 45m

Denver Intl

Sat 11/8

6:50 pm-8:15 pm

Nonstop2h 25m

$84

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Wed 11/5

8:40 am-1:35 pm

1 stop3h 55m

Denver Intl

Tue 11/11

2:20 pm-5:55 pm

1 stop4h 35m

$89

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Tue 10/14

5:10 pm-10:25 pm

1 stop4h 15m

Denver Intl

Wed 10/29

8:10 am-11:55 am

1 stop4h 45m

$93

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 11/13

5:35 pm-10:35 pm

1 stop4h 00m

Denver Intl

Wed 11/19

7:00 am-8:35 am

Nonstop2h 35m

$95

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Wed 11/19

2:24 pm-5:57 pm

Nonstop2h 33m

Denver Intl

Wed 11/26

6:20 am-8:01 am

Nonstop2h 41m

$99

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Fri 11/14

8:00 pm-11:25 pm

Nonstop2h 25m

Denver Intl

Sat 11/15

6:50 pm-8:15 pm

Nonstop2h 25m

$99

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 11/13

7:45 am-11:10 am

Nonstop2h 25m

Denver Intl

Sat 11/15

2:45 pm-5:50 pm

1 stop4h 05m

$99

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Mon 11/17

4:50 pm-9:35 pm

1 stop3h 45m

Denver Intl

Wed 11/19

1:30 pm-4:55 pm

1 stop4h 25m

$100

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Wed 10/1

12:35 pm-4:00 pm

Nonstop2h 25m

Denver Intl

Wed 10/15

8:10 am-11:55 am

1 stop4h 45m

$105

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Sun 10/5

9:03 pm-12:38 am

Nonstop2h 35m

Denver Intl

Thu 10/9

7:01 am-8:25 am

Nonstop2h 24m

$108

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 21 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 August 29, 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, October is the cheapest month in which you can book a flight from San Diego to Fort Collins (average of $197). Flying from San Diego to Fort Collins in March is currently the most expensive (average of $278). 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 September 11, 2025.

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

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 evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from San Diego to Fort Collins

Explore weekly flight availability from San Diego to Fort Collins. 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 September 11, 2025.

The most flights from SAN to FC9 are scheduled on a Thursday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

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 September 11, 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
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
4,248 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
2,723 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
3,177 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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 20 outbound flights to Fort Collins per day. You should also have plenty of airline options to choose from since 7 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 170 times in the past calendar month.

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

    Airlines like Southwest and Frontier fly from San Diego to Fort Collins in about 2h 33m. The time it takes to get you to your destination can typically vary by up to 1h 12m. 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 Frontier (83%), SWISS (77%) or Lufthansa (76%) 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 $50. While the most popular route (San Diego - Denver Intl) can be booked for $74 on average, our data indicates $659 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, October is the cheapest month in which you can book a flight from San Diego to Fort Collins (average of $197). Flying from San Diego to Fort Collins in March is currently the most expensive (average of $278). 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

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Top 7 airlines flying from San Diego to Fort Collins

Discover the top 7 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$67Average$159FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$232FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$137Average$212FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$149Average$270FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$166Average$307FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$197Average$325FlexibilityNo cancel feeOn-time71%
DeltaCheapest$206Average$306FlexibilityNo cancel feeOn-timeN/A

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