$73 Find Cheap Flights from Los Angeles to Boulder

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Los Angeles to Boulder departing on 8/9. 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.
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Cheap Flights from Los Angeles to Boulder (LAX-DEN)

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

Thu, Aug 21 - Sun, Aug 24
Frontier Logo
6:30 am - 10:06 amLAX-DEN
2h 36mnonstop
Frontier Logo
10:55 pm - 12:27 amDEN-LAX
2h 32mnonstop
$120Frontier
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Mon, Aug 25 - Thu, Aug 28
Frontier Logo
12:36 pm - 4:15 pmLAX-DEN
2h 39mnonstop
Frontier Logo
10:55 pm - 12:27 amDEN-LAX
2h 32mnonstop
$121Frontier
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Wed, Aug 6 - Tue, Aug 12
Southwest Logo
6:15 am - 9:35 amLAX-DEN
2h 20mnonstop
Southwest Logo
6:05 pm - 7:45 pmDEN-LAX
2h 40mnonstop
$145Southwest
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Tue, Aug 5 - Sat, Sep 27
Delta Logo
8:20 pm - 11:44 pmLAX-DEN
2h 24mnonstop
Delta Logo
6:30 am - 8:08 amDEN-LAX
2h 38mnonstop
$151Delta
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Sat, Nov 1 - Sat, Nov 1
American Airlines Logo
1:49 pm - 5:12 pmLAX-DEN
2h 23mnonstop
American Airlines Logo
8:57 pm - 10:31 pmDEN-LAX
2h 34mnonstop
$152American Airlines
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Wed, Aug 6 - Tue, Aug 12
Delta Logo
2:55 pm - 6:17 pmLAX-DEN
2h 22mnonstop
Delta Logo
6:45 am - 8:12 amDEN-LAX
2h 27mnonstop
$155Delta
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Thu, Aug 7 - Mon, Aug 11
Southwest Logo
6:05 pm - 10:55 pmLAX-DEN
3h 50m1 stop
Southwest Logo
9:55 pm - 11:25 pmDEN-LAX
2h 30mnonstop
$163Southwest
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Wed, Aug 20 - Wed, Aug 27
American Airlines Logo
6:05 am - 11:30 amLAX-DEN
4h 25m1 stop
American Airlines Logo
11:59 am - 1:39 pmDEN-LAX
2h 40mnonstop
$200American Airlines
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Wed, Oct 1 - Mon, Oct 6
Hawaiian Airlines Logo
8:00 am - 5:21 pmLAX-DEN
8h 21m1 stop
Hawaiian Airlines Logo
7:02 pm - 11:58 pmDEN-LAX
5h 56m1 stop
$235Hawaiian Airlines
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Tue, Jul 29 - Thu, Jul 31
Hawaiian Airlines Logo
3:10 pm - 11:59 pmLAX-DEN
7h 49m1 stop
Hawaiian Airlines Logo
7:06 pm - 11:59 pmDEN-LAX
5h 53m1 stop
$236Hawaiian Airlines
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Good to know

Low seasonMarch
High seasonJuly
Cheapest flight$73
Best time to beat the crowds but there is an average 5% increase in price.
Most popular time to fly with an average 11% increase in price.
Flight from Los Angeles to Denver

When to book flights from Los Angeles to Boulder

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

Flights from Los Angeles to Boulder: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew the route from Los Angeles to Boulder 
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 United AirlinesLAX-DENMar 2024
Arrive early if you have carry-on luggage. Eat before you get on the plane.

FAQs for booking flights from Los Angeles to Boulder

  • Which airports will I be using when flying from Los Angeles to Boulder?

    When flying out of Los Angeles you’ll be using Los Angeles. Boulder does not have its own airport so you’ll be flying into nearby Denver Intl airport, which is 33.4 mi away.

  • How long does a flight from Los Angeles to Boulder take?

    Direct flights cover the 860 miles separating Los Angeles and Boulder in about 2h 20m.

  • How many flights are there between Los Angeles and Boulder?

    110 direct flights run between Los Angeles and Boulder on a daily basis. On average, there are about 775 departures each week.

  • What’s the cheapest day of the week to fly between Los Angeles and Boulder?

    Consider leaving on a Thursday and avoid Saturdays if you are looking for the best rates. For your return to Los Angeles, you’ll find the best rates on Fridays and the most expensive ones on Thursdays.

  • How does KAYAK find such low prices on flights from Los Angeles to Boulder?

    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 Los Angeles to Boulder.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boulder from Los Angeles 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 Los Angeles to Boulder?

    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 Boulder with an airline and back to Los Angeles with another airline.

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

    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 Boulder from Los Angeles 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 Los Angeles to Boulder?

    In the last 72 hours, the cheapest one-way ticket between Los Angeles and Boulder found on KAYAK was with United Airlines for $73. Frontier offered a round-trip connection from $120 and Southwest from $145.

Top tips for finding cheap flights from Los Angeles to Boulder

  • There is no airport in Boulder. Instead, you’ll be flying into Denver Airport when flying between Los Angeles and Boulder.
  • The cheapest flight from Los Angeles to Boulder was found 31 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 January.

Reviews of the top 5 airlines serving Los Angeles to Boulder

 
Need help choosing which airline to fly with from Los Angeles to Boulder? 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 4278 reviews
8.6Crew
7.1Food
8.2Boarding
7.6Entertainment
8.0Comfort
Airline reviews

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

10.0 ExcellentMichael, Jun 2025SMF - SEA
Read more Southwest reviews

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

We sat on the plane on the tarmac for 4 hours.

After a 3 hour layover in Denver my flight was delayed over 5 hours! No explanation; no assistance; no offer to provide compensation; no one at Southwest was willing to offer any assistance. 8 hours in the Denver airport - ridiculous!

WiFi on the flight was not working. Thus, entertainment options were limited.

I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.

For the first time in a long time we had a flawless experience with Southwest. Both flights were early and no mechanical errors at all. We were shocked and pleasantly surprised 😮.

One of the crew performed a hilarious skit to accompany the standard instructions. Passengers enjoyed it so much they applauded at the end!

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Delta flight was on time, seats were comfortable, and crew was nice.

Bathrooms dirty sinks clogged. No one seemed to clean them. Plane very old

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

It was terrible, if they ran flights on time it would make a big difference.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

The food was the worst I’ve had on any flight I’ve ever been on.

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

The gate was too far away for the connecting flight

Seats were comfortable. It’s was so cold and very uncomfortable. I paid 2000 miles for wifi service that was choppy the whole flight. Would like to be reimbursed for my miles Food was so disappointing. Three cold and terrible meals for $3000 round trip. This needs to be better.

Plenty of room for me and the cat in Premium Economy. Seat was comfortable. Boarding was a breeze. The lady at the special check-in desk was great, super helpful and professional.

Smooth flight. As always dinner could have been more generous. Breakfast was great.

Old and out of date plane, it seem like every time I fly with united there’s and issue. We were delayed,

We took off an hour late due to arrival airport not having enough gates. That was followed by 1:30 wait to get our bags delivered for the entire flight.

Seats are smaller and harder than other airlines we have travels with. Food was edible but no good. The sandwich was the only thing I would eat again. They did have a lot of movies to watch.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

Cramped seats. FAA should make airlines have more legroom, for even short people complain

Eventless. It was a good flight and good crew. Can’t complaint.

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

Terrible. The flight was delayed two hours due to weather. Then when we got on the plane, the first pilot ended up timing out and we had to wait for a second pilot. Second pile came on board and we tax it out. Had to return back to the gate because of an unruly passenger. Then the copilot timed out. Had to wait for new copilot. Also had to wait for maintenance to check for fuel. Then found out the second pilot timed out and we had to wait for a third pilot. Was ready to go and then needed maintenance again for another issue. In the end, it was 2 o’clock in the morning when they announced that the flight couldn’t go because the third pilot and the second copilot had timed out.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

We kept being told that the flight was full and that all overhead compartments were full and therefore had to check in our hand luggage. We were some of the last people to board and noticed that there was still sufficient space in the overhead compartments. We were obliged to check in hand luggage when there was space and so had to wait at luggage retrieval which took a while to then noticed damage to our luggage - not a great experience!

Worst seats I’ve ever had !!! The seats were very narrow and uncomfortable and misaligned with the seats in front of mine leading to bottom of the seat in front of mine pressing on my legs for 15.5 hours !

This was an overnight flight. There was no meal service in first class, just a simple snack basket was offered along with beverages. There should have been some type of continental breakfast prior to arrival in PHL. As an Executive Platinum American Airlines Advantage member, I received no name recognition from the first class flight attendant. When disembarking at PHL, the flight attendants were more interested in their cell phones than saying "thank you" to the passengers as they disembarked.

The flight was quick and to the point. The crew just did their job w/o excessive talking and everything was just perfect.

Our flight was cancelled. They could do nothing to help us get another flight that was timely. Because the first leg was cancelled we were unable to get to our connection. We had to book on an entirely different airline for today. So we spent more money, lost a day of vacation and will never fly Frontier again, so the 'we are sorry, here is $100 credit' is a joke since we won't be flying on Frontier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

The plane failed preflight inspection, so we sat there for 90 mins while they tried to fix it. Ultimately, everything was remedied and we made our connecting flight; instead of a 2 hour layover at the airport, we spent it waiting on the plane.

They changed the timing , first delayed by 4 hours then went back to 40 mins late, we had to run back to airport to not miss our flight. This is ridiculous

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

The seats were extremely hard and uncomfortable. It was disappointing even for a budget airline.

Everything you need to know for your flight from Los Angeles to Boulder

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