$59 Find Cheap Flights to Longmont

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Longmont departing on 12/23. 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

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Cheap Flights to Longmont

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights to Longmont 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 to Longmont

Fri, Oct 24 - Sun, Oct 26
Frontier Logo
6:00 am - 7:09 amMSP-DEN
2h 09mnonstop
Frontier Logo
6:05 am - 9:05 amDEN-MSP
2h 00mnonstop
$84Frontier
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Tue, Sep 30 - Sat, Oct 4
Frontier Logo
7:45 am - 9:01 amDFW-DEN
2h 16mnonstop
Frontier Logo
7:30 am - 10:38 amDEN-DFW
2h 08mnonstop
$86Frontier
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Sat, Oct 11 - Sat, Oct 18
Delta Logo
6:20 pm - 7:30 pmMSP-DEN
2h 10mnonstop
Delta Logo
11:40 am - 2:37 pmDEN-MSP
1h 57mnonstop
$105Delta
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Sat, Oct 4 - Tue, Oct 7
United Airlines Logo
1:41 pm - 2:58 pmMSP-DEN
2h 17mnonstop
United Airlines Logo
2:10 pm - 5:10 pmDEN-MSP
2h 00mnonstop
$111United Airlines
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Sat, Oct 11 - Wed, Oct 15
Delta Logo
9:59 pm - 11:04 pmMSP-DEN
2h 05mnonstop
Delta Logo
11:05 am - 2:04 pmDEN-MSP
1h 59mnonstop
$112Delta
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Sat, Oct 11 - Wed, Oct 15
Southwest Logo
6:15 am - 3:30 pmSEA-DEN
8h 15m2 stops
Southwest Logo
9:50 pm - 11:45 pmDEN-SEA
2h 55mnonstop
$115Southwest
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Wed, Oct 15 - Sat, Oct 18
Southwest Logo
1:20 pm - 9:20 pmSEA-DEN
7h 00m1 stop
Southwest Logo
2:45 pm - 8:35 pmDEN-SEA
6h 50m1 stop
$120Southwest
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Wed, Oct 8 - Sat, Oct 25
United Airlines Logo
9:44 pm - 11:30 pmORD-DEN
2h 46mnonstop
United Airlines Logo
4:15 pm - 7:55 pmDEN-ORD
2h 40mnonstop
$127United Airlines
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Wed, Oct 8 - Tue, Oct 14
American Airlines Logo
2:57 pm - 10:05 pmJFK-DEN
9h 08m1 stop
American Airlines Logo
10:42 am - 9:13 pmDEN-JFK
8h 31m1 stop
$185American Airlines
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Thu, Dec 11 - Sat, Dec 13
American Airlines Logo
2:28 pm - 9:57 pmBOS-DEN
9h 29m1 stop
American Airlines Logo
10:20 am - 8:47 pmDEN-BOS
8h 27m1 stop
$206American Airlines
Find Deal

Everything you should know

Top routes
DFW-DEN
Cheapest
LAX-DEN
Most popular
Insights
Insights
Insights
Insights
Cheapest round-trip
$84
Overall average: $138
Frontier
Fri 10/24Sun 10/26
MSP - DEN • Non-stop
Cheapest one-way
$59
Typical prices: $97-270
American Airlines
Tue 12/23
DFW - DEN • Non-stop
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We hope you love your trip to Longmont!
Useful Info

Good to know - Book Cheap Longmont Plane Tickets

Low seasonApril
Cheapest flight$59
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly with an average 1% increase in price.
Flight from Dallas/Fort Worth Airport to Denver

Flights to Longmont: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew to Longmont 
Verified travelerFlew with FrontierPDX-DENJun 2025
Make sure your carry on bag meets the size limit as bin space on plane is limited. Check any bags online in advance to avoid extra charges for using agent at the airport.
Verified travelerFlew with FrontierGRR-DENJun 2025
Don't purchase vouchers with connections on the cheaper flights (such as frontier or Spirit), you're bound to have a delay. middle or more expensive airlines are more reliable, comfortable, and have consistent pleasant staff working.
Verified travelerFlew with Alaska AirlinesSEA-DENMar 2025
Alaska Air is very efficient & on-time so allow enough time to get luggage, go thru Customs & Immigration, & long security lines. Terminals in SEA are readily accessible by trains but more signage is needed. Fortunately, Information booths are everywhere & are manned by very helpful staff.
Verified travelerFlew with Air CanadaPHX-DENApr 2025
All was great would surly book again and recommend Be on the ball and find gate before landing
Verified travelerFlew with DeltaLAX-DENApr 2025
It’s an easy short flight, so a quick recharge nap is nice. A neck pillow is recommended.
MichaelFlew with DeltaSEA-DENApr 2025
Train from Denver airport to downtown is easy to use.
MatthewFlew with FrontierMSP-DENMar 2025
Bring a seat cushion? The seats aren’t very comfortable.
DavidFlew with JetBlueJFK-DENJan 2025
JetBlue leaves from JFK which can be a plus or minus depending on your plans in New York. Arrive early and check out the TWA hotel—with a great public lounge, bar, and food court in the restored 1960’s Eero Saarinen-designed building outside of terminal 5. The AirTran accepts OMNY tap to pay with your phone or credit card, take it to Jamaica station to transfer to the LIRR to go to Penn Station in Manhattan or check the MTA TrainTime app for schedules and tickets for other destinations.
BrittanyFlew with United AirlinesRSW-DENDec 2024
Prepare for a long flight and always have back up entertainment options prepared in case a different plane gets subbed before your flight with no notice.
DavidFlew with United AirlinesMKE-DENDec 2024
Fill up water bottles at the fountain right after security (there’s only one water filler per concourse).
DanaFlew with United AirlinesATL-DENNov 2024
Bring your own headset if you want to plug into the in chair TV. They don’t have any to pass out.
MohanFlew with FrontierRDU-DENOct 2024
Check-in online and ensure your personal item is not big, these guys are a pain to deal with
kristenFlew with United AirlinesASE-DENJul 2024
weather can cause delays, and pack light if you chose to carry-on
AdrianFlew with United AirlinesICT-DENAug 2024
Don’t have your connection flight scheduled so close together
RogerFlew with United AirlinesHNL-DENJun 2024
According to HNL gate agent arriving UA 1805 from Denver Is “infamously” late, so don’t take the redeye UA 1806 turn around flight unless your prepared to camp out in the airport and possibly miss connections on the US mainland
Verified travelerFlew with LufthansaPSP-DENMar 2024
Palm Springs is beautiful airport, check in your tickets before arriving. Busy drop off but still manageable.
Verified travelerFlew with United AirlinesSFO-DENMar 2024
Get TSA PRE and CLEAR. Life will be easy.
Verified travelerFlew with Alaska AirlinesSEA-DENMay 2024
When flying from Seattle to Denver, be ready to take our any electronics and put them in separate bins when going through security. You will also most likely have to take off your jacket as well. During our flight back the flight randomly changed so be on the lookout in case that happens to you! It was by chance that I checked my ticket and saw that the gate changed last minute.
JoanneFlew with Air CanadaMSP-DENApr 2024
It was not clear to me that my Air Canada flight would be handled by United, so I had some uncertainty about check-in. A United employee helped me check in eventually. Check for code-sharing partners.
MichaelFlew with United AirlinesLAX-DENMar 2024
Arrive early if you have carry-on luggage. Eat before you get on the plane.
Verified travelerFlew with Air CanadaCOS-DENMar 2024
Make sure to have snacks and drinks with you if you need them.
Verified travelerFlew with United AirlinesGEG-DENApr 2024
Time to switch planes should be more than 60 minutes.
Verified travelerFlew with FrontierDCA-DENDec 2023
Always check the rules and guidelines prior to boarding. Be early. Rest and eat before departure.
Verified travelerFlew with United AirlinesPSC-DENFeb 2024
TSA doesn't open til 1030 so getting to the airport early isn't helpful
JeffreyFlew with DeltaJFK-DENJan 2024
Leave a lot of time to get to your gate.
BrianFlew with United AirlinesSBP-DENJan 2024
Don’t arrive too early since it’s a small airport.
KristofferFlew with United AirlinesATL-DENFeb 2024
Check prices all the time as they fluctuate often

FAQs - booking Longmont flights

  • How long is the flight to Longmont?

    Flights from Phoenix1h 59m
    Flights from Chicago2h 41m
    Flights from Dallas2h 13m
    Flights from Minneapolis2h 05m
    Flights from Los Angeles2h 33m
  • What is the cheapest flight to Denver?

    In the last 3 days, the cheapest flight deal to Denver was found on the route from Dallas, at $84 return. The most popular connection is from Los Angeles to Denver and KAYAK users have found round-trip deals for as low as $86 in the last 3 days.

  • Which airlines fly to Denver?

    Many airlines fly to Denver, the most common ones being United Airlines, Southwest, and Frontier. See the amount of flights per week for popular airlines flying to Denver.

  • How to fly to Longmont?

    You cannot fly directly to Longmont. KAYAK recommends you fly to Denver Intl (DEN) (31.1 miles from Longmont). From there you can rent a car or get a taxi.

  • What airports are near Longmont?

    The closest airport is Denver Intl (DEN) (31.1 mi). KAYAK recommends you fly to Denver Intl.

  • How far is Denver Intl Airport from central Denver?

    The city center of Denver is 18 miles from Denver Intl Airport.

  • What is the name of Denver’s airport?

    All flights to Denver land at Denver Intl Airport. The airport code is DEN,and it can also be referred to as Denver or Denver Intl.

  • How does KAYAK find such low prices on flights to Longmont?

    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 to Longmont.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Longmont?

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

  • What is the Hacker Fare option on flights to Longmont?

    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 Longmont with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Longmont?

    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 Longmont up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Longmont

  • There is no major airport in Longmont. It is instead served by Denver Intl Airport.
  • Looking for cheap airfare to Longmont? 25% of our users found round-trip tickets to Longmont for the following prices or less: From Los Angeles $430, from Miami $597, from Boston $619
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Longmont flight deals.

Reviews of the top 5 airlines flying to Longmont

 
Need help choosing which airline to fly with from the United States to Longmont? 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 4248 reviews
7.0Food
8.1Boarding
7.5Entertainment
8.6Crew
8.0Comfort
Airline reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

10.0 ExcellentG, Sep 2025LAS - ATL
Read more Southwest reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

After being assaulted by a flight attendant I was then brushed off as oh well because he long braids didn’t mean to whip me in the eye. I have filed complaints and will see. But like any other issue I’ve had with kayak involved it’s been trash. Last time I’ll be using your app

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

Southwest's seats are the least comfortable I have ever sat in.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Southwest like most American domestic airlines, is a mediocre airline. But it is among the cheapest. Oh well.

My flight was delayed 50 minutes and we were rushed to board to then sit for 15 minutes until the pilot arrived. Unacceptable since we could have waited to board. Also the delayed flight was updated AFTER we boarded to more than the 10 minutes as originally stated.

Perfect flight both ways. On time, courteous staff, plane comfortable and cool. Best domestic flights I’ve had in awhile.

Really low quality food especially for an international flight. The crew also was surprisingly unpleasant except couple of ladies. I know we were not in first class but that’s no reason to treat customers as less.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

Crew was good. The reservation got mixed up and they didn't have my TSA number. I am also a Silver Medallion and wasn't able to use Sky Priority.

Delta made it easy, comfortable and timely. The crew was fantastic.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

Three seats in first class were broken and while they were able to still acommodate us it was looking very touch and go and they had others they could not acommodate

Mechanic delay in addition to a 2 hour change in takeoff time was frustrating.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

The flight attendants in SLC were rude. I arrived 40 minutes early to gate. Ticket said I needed check in for seat assignments and tried check in and attendants said they weren’t doing it. And proceeded to never call me to give me a ticket so when time to board I received the very last seat. Please relay to employees to do their job better..,

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

Very rough getting into denver. my kid threw up it was so rough.

Why wasn't this flight departure scheduled eith another crew so that it could leave on time? When we arrived in Denver we had so little time between flights we had run to the connecting flight. We should received some credit for the inconvenience.

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Given it’s a red-eye into Charolotte, we didn’t get any food. The survey does not include “N/A” so the rating will be skewed.

Great. Quick and quiet and east. The breakfast choices were a welcome surprise!

American airlines suck they delay the flights all the time made me sleep in an airport because my flight was delayed and I miss my connecting flight

There's nothing I liked about it. For first off I scheduled this trip two weeks in advance then they delayed my flight which messed up my whole trip. So I scheduled it for the following weekend thinking there won't be a delay and guess what as soon as I got to the airport we said in the airplane on the tarmac for an hour and a half. Not only was it delayed I missed my connecting flight meaning I had to stay the night at Dallas-Fort Worth airport sleeping on the floor. I will tell you this I will never fly American airlines ever again I have had nothing but horrible experience with them and I just throw money at them

The stewardess hit me with the food kart twice on the head and didn't say I'm sorry once. The same stewardess gave me a warm Apple Juice with No ice. The Flight was delayed for Departure 6 times, starting from 2:36pm, finally taking off 7:50pm. I was late picking up my child from the sitter by 3 hours.

Having to reschedule flights a day later, they loaded by luggage on the wrong plane from Little rock now I have to HOPE they deliver it to where im staying like they said would. International flight crew was very disgruntled and not very friendly.

We will be writing a long, detailed letter to corporate about our awful experience with American airlines.

It took way too long to diagnose and solve the problem of a broken crew member cabin seat. Though compensation for the volunteer who left the flight was very kind.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

Terrible communication with weather delay, lost baggage, near impossible to reach customer service

My tickets got canceled on me by your site and I didn't have a flight. Then you kept sending me emails on the status of q flight I didn't have tickets for.

Flight was late. Missed connecting in Denver. My new flight is more than 24 hours later and I have no room, vouchers, or compensation, and might also be bumped from the one tomorrow.

This was one of the first frontier airline flights this spring that wasn't delayed. It actually left on time. Some of the flight crew did not look happy, they didn't smile when the passengers were boarding or getting off the plane, and the passengers initiated greetings, not the staff. To me this was an odd experience to have with any flight/airline. I had a bad experience booking this flight. The price didn't solidify until late hours into the night. Ever time I purchased the ticket, I either received a denial email or an error because the price has changed, but it was never reflected on the flyfrontier or kayak websites until way after midnight on the date of travel. This caused me anxiety and irritation with the websites. Then I noticed a mishap with my name on my voucher as I went to check in, it was incorrect. When I proceeded to correct it, Frontier had no easy, let alone free, way to remedy it. I couldn't correct my name without a $75 charge, I couldn't cancel my voucher to repurchase it with the correct name without a $100 charge, because it was too close to departure. Then calling frontier was nearly impossible to remedy the situation with a human. It's already difficult to want to choose frontier because of all the upcharges, but you feel kinda trapped into doing so because it's the more affordable airline.

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