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$39+ Cheap flights from Los Angeles (LAX) to Boulder, 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 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — DEN
Jan 25 — Feb 11
Sun 1/25
Sun 2/1
1 adult, Economy
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Find cheap flights from Los Angeles to Boulder 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

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Cheapflights Tip: The best prices from Los Angeles to Boulder are usually found in January or September, booked 61 days in advance, depart on a Friday or Tuesday and return on a Friday

Cheap flight deals from Los Angeles to Boulder

Cheapest flights from Los Angeles to Boulder
Explore the most affordable flight options available from Los Angeles to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 26, 2025.

This CheapOair deal was found by Cheapflights users on 12/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:34 amLAX - DEN
Nonstop2h 32mFrontier
Tue 1/611:04 amDEN - LAX
Nonstop2h 38mFrontier
Deal found 12/24$94
This Cheapflightsfares deal was found by Cheapflights users on 12/23. 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.
Wed 12/3112:30 pmLAX - DEN
Nonstop2h 32mFrontier
Mon 1/56:15 amDEN - LAX
1 stop8h 07mFrontier
Deal found 12/23$120
This Frontier deal was found by Cheapflights users on 12/22. 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.
Wed 12/315:09 pmLAX - DEN
1 stop4h 30mFrontier
Wed 1/711:04 amDEN - LAX
Nonstop2h 38mFrontier
Deal found 12/22$145
This Cheapflightsfares deal was found by Cheapflights users on 12/23. 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.
Wed 12/315:09 pmLAX - DEN
1 stop4h 30mFrontier
Thu 1/87:00 amDEN - LAX
1 stop4h 38mFrontier
Deal found 12/23$162
This Frontier deal was found by Cheapflights users on 12/24. 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.
Wed 12/316:34 amLAX - DEN
Nonstop2h 32mFrontier
Sat 1/36:00 amDEN - LAX
Nonstop2h 42mFrontier
Deal found 12/24$169

Find flight deals from Los Angeles to Boulder

Keep the following information in mind while searching for Los Angeles to Boulder flight deals. Data was last updated December 26, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$87
(Super.com)

One-way from

$39
(Frontier)

Popular in

June

Cheapest in

January

Average price

$214
Provider with most accurate pricing for Los Angeles-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Denver Intl flights.
Search Deals
From Los Angeles to Boulder
Search Deals
One-way flight from Los Angeles to Boulder
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Los Angeles to Boulder 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 December 26, 2025.
Use the filters below to find and compare flights from Los Angeles to Boulder that are best for you.

Fly from

Los Angeles

Fly to

Boulder

Route

Depart

Return

Price

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 1/14

1:54 pm-5:24 pm

Nonstop2h 30m

Denver Intl

Fri 1/16

10:42 pm-12:29 am

Nonstop2h 47m

$96

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Thu 1/15

2:11 pm-5:40 pm

Nonstop2h 29m

Denver Intl

Sun 1/25

6:05 am-7:51 am

Nonstop2h 46m

$108

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Thu 1/15

9:26 pm-8:44 am

1 stop10h 18m

Denver Intl

Sat 1/17

11:22 am-1:08 pm

Nonstop2h 46m

$110

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Thu 1/15

6:01 am-9:30 am

Nonstop2h 29m

Denver Intl

Mon 1/19

10:42 pm-12:29 am

Nonstop2h 47m

$128

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 2/11

2:35 pm-6:00 pm

Nonstop2h 25m

Denver Intl

Sat 2/14

5:45 am-7:32 am

Nonstop2h 47m

$157

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 1/21

7:01 am-10:30 am

Nonstop2h 29m

Denver Intl

Wed 1/28

8:50 pm-10:28 pm

Nonstop2h 38m

$157

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Tue 1/20

5:00 am-8:28 am

Nonstop2h 28m

Denver Intl

Sat 1/24

7:40 pm-9:18 pm

Nonstop2h 38m

$157

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Fri 1/23

2:04 pm-8:20 pm

1 stop5h 16m

Denver Intl

Sun 1/25

6:05 am-7:51 am

Nonstop2h 46m

$159

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 12/31

5:09 pm-10:39 pm

1 stop4h 30m

Denver Intl

Thu 1/8

7:00 am-10:38 am

1 stop4h 38m

$162

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Tue 1/20

1:45 pm-7:05 pm

1 stop4h 20m

Denver Intl

Sat 1/24

8:00 am-9:50 am

Nonstop2h 50m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/24

Showing 1-10 of 22 results
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Best time to book a flight from Los Angeles to Boulder

Have a flexible travel schedule? Discover the best time to fly to Boulder from Los Angeles 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 Los Angeles to Boulder

How far ahead should I book a flight from Los Angeles to Boulder?

Use this chart to determine the optimal time to book a round-trip flight from Los Angeles to Boulder. Price data was last updated on December 19, 2025.

The price you pay for your flight from Los Angeles to Boulder may vary depending on when you book. For the best chance of a lower fare, look to book 61 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Los Angeles to Boulder?

Currently, March is the cheapest month in which you can book a flight from Los Angeles to Boulder (average of $36). Flying from Los Angeles to Boulder in July is currently the most expensive (average of $91). 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 LAX to BD9?

Find hourly flight availability from Los Angeles to Boulder. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 26, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 33% on flights from Los Angeles to Boulder by exploring options for tickets in the evening.

What is the cheapest day to fly from Los Angeles to Boulder?

Use this chart to determine the cheapest time to fly round-trip from Los Angeles to Boulder. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Los Angeles to Boulder flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Los Angeles to Boulder

Explore weekly flight availability from Los Angeles to Boulder. 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 December 26, 2025.

The most flights from LAX to BD9 are scheduled on a Friday (95 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (64 on average).

How much does it cost to fly round-trip from Los Angeles to Boulder?

Reviews of airlines servicing Boulder

Get insights into the airlines that provide service to Boulder. 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 Boulder. Reviews last updated December 26, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Los Angeles to Boulder by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,258 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,013 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,115 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,062 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,070 reviews
Southwest
8.0
Very good
4,258 reviews

Food

7.0

Entertainment

7.5

Crew

8.6

Boarding

8.1

Overall

8.0

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Los Angeles to Boulder. 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 Los Angeles to Boulder?

    Located just 9.4 mi from the city center, Los Angeles is the airport most travelers will use when flying to Boulder from Los Angeles. Booking flights from Los Angeles (LAX) to Boulder should be relatively easy as there are 78 daily outbound flights to Boulder from 6 different airlines.

  • How popular is this Los Angeles to Boulder flight route?

    The Los Angeles to Boulder flight path was viewed by 456 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Los Angeles to Boulder?

    There are many flights that can get you from Los Angeles to Boulder in 2h 25m. Fly via Frontier or Delta to get the fastest option. There are 860 mi between Los Angeles and Boulder. All flights are typically nonstop.

  • What are the cheapest airlines to fly from Los Angeles to Boulder one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $30. Users have also found prices from $68 and $69 on Delta and Southwest, respectively.

  • What are the most reliable airlines from Los Angeles to Boulder?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Los Angeles to Boulder on time: Air France (97%), Asiana Airlines (95%), Volaris (94%).

  • What are the cheapest flights from Los Angeles to Boulder?

    While on average a flight from Los Angeles to Boulder is generally $749, our data shows the cheapest flight currently is $45. When looking at the most popular route, (Los Angeles - Denver Intl), you can expect to pay $73 for that flight.

  • Can I find deals for flights from Los Angeles to Boulder that include hotel bookings?

    Yes. In addition to deals on Los Angeles to Boulder flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Los Angeles to Boulder?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Los Angeles to Boulder.

  • Can I find deals for business class flights from Los Angeles to Boulder?

    Yes. Cheapflights offers flight deals from Los Angeles to Boulder 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 Los Angeles to Boulder?

    Currently, March is the cheapest month in which you can book a flight from Los Angeles to Boulder (average of $36). Flying from Los Angeles to Boulder in July is currently the most expensive (average of $91). 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 6 airlines flying from Los Angeles to Boulder

Discover the top 6 airlines that operate flights from Los Angeles to Boulder. 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 December 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$57Average$151FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$84Average$98FlexibilityNo cancel feeOn-time88%
DeltaCheapest$120Average$238FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$137Average$302FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$144Average$344FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$147Average$248FlexibilityNo cancel feeOn-time71%

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