$88 Find Cheap Flights from San Diego to Fort Collins - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Diego to Fort Collins departing on 9/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$149
Typical prices: $105-$228
Frontier
Wed 10/14Fri 10/30
SAN - DEN • 1 stop
Cheapest non-stop
$149
Typical prices: $157-$270
Frontier
Fri 8/21Tue 8/25
SAN - DEN • Non-stop
Arrival airport
You can't fly directly to Fort Collins. It is served by Denver (DEN), located 54.6 miles from Fort Collins.
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from San Diego to Fort Collins (SAN-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Diego to Fort Collins that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Diego to Fort Collins

Wed, Oct 14 - Fri, Oct 30
Frontier Logo
4:36 pm - 10:59 pm
SAN
-
DEN
5h 23m
1 stop
Frontier Logo
2:12 pm - 3:41 pm
DEN
-
SAN
2h 29mnonstop
$149Frontier
Thu, Oct 15 - Fri, Oct 30
Frontier Logo
9:43 pm - 9:04 am
SAN
-
DEN
10h 21m
1 stop
Frontier Logo
2:12 pm - 3:41 pm
DEN
-
SAN
2h 29mnonstop
$149Frontier
Fri, Sep 18 - Sat, Sep 26
Southwest Logo
2:40 pm - 8:10 pm
SAN
-
DEN
4h 30m
1 stop
Southwest Logo
1:45 pm - 5:15 pm
DEN
-
SAN
4h 30m
1 stop
$152Southwest
Thu, Aug 20 - Tue, Sep 8
Multiple Airlines Logo
3:45 pm - 7:20 pm
SAN
-
DEN
2h 35mnonstop
Multiple Airlines Logo
6:17 am - 7:50 am
DEN
-
SAN
2h 33mnonstop
$156Multiple Airlines
Thu, Sep 24 - Mon, Sep 28
United Airlines Logo
8:45 am - 12:18 pm
SAN
-
DEN
2h 33mnonstop
United Airlines Logo
9:00 pm - 10:27 pm
DEN
-
SAN
2h 27mnonstop
$157United Airlines
Thu, Sep 24 - Sun, Sep 27
United Airlines Logo
7:00 am - 10:33 am
SAN
-
DEN
2h 33mnonstop
United Airlines Logo
9:00 pm - 10:27 pm
DEN
-
SAN
2h 27mnonstop
$157United Airlines
Wed, Sep 2 - Sat, Sep 5
Alaska Airlines Logo
8:48 am - 12:20 pm
SAN
-
DEN
2h 32mnonstop
Alaska Airlines Logo
1:43 pm - 3:16 pm
DEN
-
SAN
2h 33mnonstop
$157Alaska Airlines
Mon, Oct 12 - Sun, Oct 25
Alaska Airlines Logo
8:19 pm - 11:59 pm
SAN
-
DEN
2h 40mnonstop
Alaska Airlines Logo
6:59 pm - 8:34 pm
DEN
-
SAN
2h 35mnonstop
$157Alaska Airlines
Sun, Sep 6 - Tue, Sep 8
Southwest Logo
7:35 am - 2:05 pm
SAN
-
DEN
5h 30m
1 stop
Southwest Logo
12:35 pm - 4:35 pm
DEN
-
SAN
5h 00m
1 stop
$157Southwest
Sat, Sep 12 - Tue, Sep 15
American Airlines Logo
9:46 am - 3:54 pm
SAN
-
DEN
5h 08m
1 stop
American Airlines Logo
12:17 pm - 6:16 pm
DEN
-
SAN
6h 59m
1 stop
$159American Airlines
Useful Info

Good to know

Low season

January

Cheapest flight

$88
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from San Diego to Denver

When to book flights from San Diego to Fort Collins

Are your dates flexible? Find out the best times to travel from San Diego to Fort Collins based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

FAQs for booking flights from San Diego to Fort Collins

  • Which airports will I be using when flying from San Diego to Fort Collins?

    When flying out of San Diego you’ll be using San Diego. Fort Collins does not have its own airport so you’ll be flying into nearby Denver Intl airport, which is 54.6 mi away.

  • How long does a flight from San Diego to Fort Collins take?

    Direct flights cover the 852 miles separating San Diego and Fort Collins in about 2h 20m.

  • How many flights are there between San Diego and Fort Collins?

    35 direct flights run between San Diego and Fort Collins on a daily basis. On average, there are about 248 departures each week.

  • What’s the cheapest day of the week to fly between San Diego and Fort Collins?

    Consider leaving on a Friday and avoid Mondays if you are looking for the best rates. For your return to San Diego, you’ll find the best rates on Saturdays and the most expensive ones on Sundays.

  • How does KAYAK find such low prices on flights from San Diego to Fort Collins?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Diego to Fort Collins.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Diego to Fort Collins?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Fort Collins from San Diego is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Diego to Fort Collins?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Fort Collins with an airline and back to San Diego with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Diego to Fort Collins?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Fort Collins from San Diego up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from San Diego to Fort Collins?

    In the last 5 days, the cheapest one-way ticket between San Diego and Fort Collins found on KAYAK was with Frontier for $28. Frontier offered a round-trip connection from $47 and Hawaiian Airlines from $58.

Top tips for finding cheap flights from San Diego to Fort Collins

  • There is no airport in Fort Collins. Instead, you’ll be flying into Denver Airport when flying between San Diego and Fort Collins.
  • The cheapest flight from San Diego to Fort Collins was found 63 days before departure, on average.
  • Book at least 2 weeks before departure in order to get a below-average price.
  • High season is considered to be May, June and July. The cheapest month to fly is February.

Reviews of the top 5 airlines serving San Diego to Fort Collins

 
Need help choosing which airline to fly with from San Diego to Fort Collins? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4230 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

Red eye from San Diego. Temperature of the cabin was way too warm and the air duct flowed very little air.

6.0 GoodGordon, Jul 2026
SAN - MCO
Read more Southwest reviews

Red eye from San Diego. Temperature of the cabin was way too warm and the air duct flowed very little air.

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The charges were ridiculous for an hour flight and the turbulence was very scary.

The seats are now more narrow. I paid for front row the seats in the front are even more narrow than before.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

There was over a 9 hour delay for one thing after another. A toilet problem, they had to change the brakes, they had to refuel, three pilots times out, etc. We had to sit on the plane at the gate for over 5 hours with no air.

Unfortunately it was not a good experience. There was a rude stewardess.

The flight was very late departing the gate, for unknown reasons.

Now that Spirit is not around Alaska took over the title of cheap and worse airlines with high prices for garbage cheap planes. Seats recline the entire 2”. What’s the purpose? Just make the stationary. Crew is on steroids. Food is like McDonald’s happy meal. Only happy in the name rest is garbage

Loved being about to check my carry on for free then getting to board earlier ( Group c rather than F) Crew was very nice and accommodating. Enjoyed the beverage and pretzels - I'll fly Alaska again if given the opportunity

Only issue is that when you board last they make you check your carry on due to lack of space. Did not care for that.

delay was longer than the entire flight. I didn’t stop flying with delta for this.

There were 5 delays IN TOTAL there and back. And we got a $12 food voucher, RIDICULOUS. Will never fly Alaska again!

Orderly boarding; engaged, attentive and detailed flight crew. Late out of the gate but time recovered during flight; super landing and deplaning.

My flight was several times rescheduled and then finally canceled.

All airlines should board planes back to front, instead of catering to higher priced tickets. The boarding groups are inefficient and delay takeoff time

Sitting on the ground for 2 hours waiting for a gate wasn't fun.

The Kayak confirmation number did not work for checking in the day before. I checked in at 8.30 using my ticket number. When I arrived at the airport, I was informed that the flight was overbooked, and since I had checked in late, I did not have a seat. The Next flight was not until ten PM. I called my wife, who had been taking care of our kids all weekend, and she was upset, calling me a liar and telling me to stay in SD. It turned my weekend getaway into a nightmare! I blame the Kayak website and will not book flights using your app in the future.

comfortable but the food is horrible. I have flown Hawaiian several times now and no matter what they say the food is its the same squashed bread with melted goop inside. Tastes fake and isnt what they represent, its quite nasty. What happend to real food? And there is NO entertainment!! so not sure why they are asking for a review on that.

3 hour wait on customer service after flight was cancelled. Was bumped to a flight where I wouldnt have gotten to my destination for another 2 days. Had to fully refund flight and book a new one the following morning. Paid twice the amount for the flight than I had originally booked. Very disappointed I was not offered any sort of discount or points for all of the frustration, in fact the airline profited twice as much off of me by cancelling my flight and and changing my entire trip.

I accidentally made this purchase and they wouldn’t refund me even though I called immediately to cancel it.

The flight was delayed and they didn’t have a pilot for the flight. Seemed very unorganized and took way longer than expected.

The worst flight experience I've ever had. Our flight was delayed 14 whole hours because the flight crew never showed up. We had to wait in a two hour line to get our new boarding passes, we were told we had no other option but to fly at 10pm (we didn't depart until 11:45pm). Everyone had to contact their hotels and car rental places, workplaces, etc. since we lost an entire day's worth of travel. The crew showed up at 10:15, which was past the time we were supposed to board. They were laughing and being completely smug when they boarded, and they took another hour to board us onto our flight. The flight crew never came to check in on us, we were quickly given one drink and sandwich and they turned off the lights and were negligent the rest of the trip. My mom asked three attendants for a seat belt extender, they never brought one. I was dehydrated and never received another drink. They were very rude and unfriendly, we had been up since 4am the morning of our flight and didn't land in our destination until 2am the next day (5am local time). This was unacceptable service and treatment, these flights are not cheap and we were inconvenienced out of an entire day of travel. This was 100% avoidable and was the fault of Hawaiian Airlines, and their crews inability to show up to work on time.

I was unable to get a check im and get a boarding pass. I tried at the desk of the flight operator Alaska, was told to go to Hawaiian and almost had to go back to Alaskan. In the end inwas told to go thru security and directly to the gate without checking in. It would have been more helpful to have the details rather than walking all over the terminals trying to check in.

We were delayed at the SD gate for close to an hour before we were allowed to depart for SJ. Reason given was inadequate ground crew to move the plane from the gate.

Your crew shortage delayed departure by an hour resulting in us missing an event we had scheduled for that afternoon outside of Fresno.

Despite two calls as well as a chat on the website, Alaska would not add my TSA number to my reservation. The flight was switched from Hawaiian to Alaska which caused them to mess this up in the first place

Service was professional and quick. Premium economy seat was comfortable given the class

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Over 2.5 hour maintenance delay on first morning flight with no acknowledgement, compensation or even gesture of good will. Aircraft had overnighted at airport so issue should have been addressed prior to boarding. Over 3.5 hours before first slow and deliberate beverage service.

Complimentary light meal would be appreciated. But great flight crew service on all legs

The food was terrible this time. Otherwise pleasant, quiet, on-time.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

As usual, United scheduling is completely misleading. A 54-minute layover at O’Hare is too short to make a lot of connections, especially since the flight landed “on time” but had to wait on the taxiway 15 minutes for a gate to open up. Then it takes another 10 minutes to exit the plane before one can run to another concourse to catch a connecting flight.

Flight was ok. Unfortunately it was a Boeing 737, which is a cramped / tight airplane. I prefer the Airbus as they are a more comfortable flight experience.

We were traveling as a family of 5 and they refused to seat us together. There were entire rows open, and my 13 year old daughter had to sit alone. Ridiculous!

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

We had an awful experience getting our bags checked in. Frontier’s check in on the app manipulated us into buying the business package because that was the only option available for a checked bag which included two checked bags per person which we did not need. Upon arriving to the airport, we stood in line for what seemed like forever at the baggage check in and there was no one available at the counter. We were first in line and we were afraid we were going to miss our flight due to the baggage attendant being late. After realizing there were a lot of other people waiting at the baggage check in and no one available. I reached out to Frontier and could not get any customer service so I had to call the airport to page the baggage attendant to send someone to the counter to check in our bags before we were able to go through security , I finally spoke to the attendant at the counter and explained to her that we had to pay for two checked bags person a total of six bags when we only had a total of three bags between three people she said to reach out to Frontier and they would issue a refund for the three bags that we paid for and did not need. I reached out to Frontier which I was not able to reach anybody by phone so I had to go through their automated chat feature, which sent me around in circles until I finally reached a representative to assist me. I explained to them what happened and they explained that they were not able to assist me. I continued to push the issue with them as this was very frustrating and they finally put in a customer service ticket where we were issued a flight credit and we were so disappointed because after this experience, we NEVER want to fly Frontier again, and we do not want a credit that we will not use. Frontier charged us almost $500 for us to check three bags which is absolutely absurd! The customer service agents were not able to offer anything else other than a flight credit and I do not feel like my frustrations were truly heard , we will never use Frontier Airlines again ! Truly Theft by Manipulation! They should be ashamed!

Every day about it was very different all the boarding pass where all wrong l miss flight no refund all crazy

The trip was good but the last minute changes I didn’t like because I had already talked to the attendee and they didn’t help me with my ticket I was having trouble checking in and when the time was up they help me but charge me for that and last minute luggage it was a small bag. After I was in the airplane I realized you were charging because the flight was almost empty and you have to get the money some how. Thanks for everything.

Our flight was delayed by four hours without notice, the app for getting my boarding pass is super confusing, and I wasn’t able to check a suitcase without paying for a higher cost package

First the gate was a total nightmare-no chairs anywhere! So over crowded and only one bathroom and nightmare of food service - took forever and NOT one place to sit. No inflight entertainment and had to pay 60.00 for a small carry on. I will never fly Frontier again!

I didn't like anything about the flight It was my first time and definitely my last time boarding a frontier flight. Their counter agents need training and they need to learn to communicate regularly and respectfully

Flight was 3 hours late leaving. Poor communication from the staff about delays. Impossible to get in touch with customer service (by design). And it actually didn't come out to be much cheaper than a non-budget airline! Not worth the headache, I'm never flying Frontier again

I did not enjoy the trip home on Frontier for several reasons: there is too much cost besides the flight, which was more than I would normally pay, then having to pay for luggage, and carry-on, seat (if you want to reserve when booking) then you must pay over $3 for a can of soda, and $4 for a snack. A cup of water is free.

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Terrible. Seats are bad and the baggage policy is inconsistent

Everything you need to know for your flight from San Diego to Fort Collins

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