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$75+ 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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — DEN
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheapflights Tip: The best prices from Los Angeles to Boulder are usually found in January or September, booked 31 days in advance, depart on a Saturday or Wednesday and return on a Friday

Cheap 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 July 31, 2025.

Round-trip from

$106
(Kiwi.com)

One-way from

$75
(FlightHub)

Popular in

June

Cheapest in

January

Average price

$217
From Los Angeles to Boulder
Search Deals
One-way flight from Los Angeles to Boulder
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find 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 July 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/83:46 pmLAX - DEN
Nonstop2h 35mFrontier
Wed 11/1210:55 pmDEN - LAX
Nonstop2h 30mFrontier
Deal found 7/30$106
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:04 amLAX - DEN
Nonstop2h 24mDelta
Wed 10/17:21 pmDEN - LAX
Nonstop2h 32mDelta
Deal found 7/31$139

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 July 31, 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

Tue 8/26

6:45 am-10:21 am

Nonstop2h 36m

Denver Intl

Thu 8/28

10:55 pm-12:27 am

Nonstop2h 32m

$106

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 10/1

8:04 am-11:28 am

Nonstop2h 24m

Denver Intl

Wed 10/1

7:21 pm-8:53 pm

Nonstop2h 32m

$139

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Fri 8/22

3:30 pm-7:04 pm

Nonstop2h 34m

$75

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 8/27

2:59 pm-6:21 pm

Nonstop2h 22m

$85

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Tue 9/16

7:00 am-5:21 pm

1 stop9h 21m

$88

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Mon 9/8

8:55 pm-4:00 am

1 stop6h 05m

$98

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Fri 10/24

8:06 pm-11:29 pm

Nonstop2h 23m

$99

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Fri 9/26

6:05 pm-10:55 pm

1 stop3h 50m

$104

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Wed 10/1

5:05 am-8:28 am

Nonstop2h 23m

$105

Los AngelesDenver

LAX - DEN

LAXDEN

Los Angeles

Mon 10/27

9:00 am-6:23 pm

1 stop8h 23m

$108

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 July 25, 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 31 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, October is the cheapest month in which you can book a flight from Los Angeles to Boulder (average of $197). Flying from Los Angeles to Boulder 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 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 July 31, 2025.

When flying from Los Angeles to Boulder, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 Saturday afternoons 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 July 31, 2025.

The most flights from LAX to BD9 are scheduled on a Wednesday (98 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (55 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 July 31, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 387 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • 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 $75. Users have also found prices from $85 and $88 on Delta and Alaska Airlines, 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: EL AL (87%), Alaska Airlines (84%), Cathay Pacific (82%).

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

    While on average a flight from Los Angeles to Boulder is generally $716, our data shows the cheapest flight currently is $77. When looking at the most popular route, (Los Angeles - Denver Intl), you can expect to pay $80 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, October is the cheapest month in which you can book a flight from Los Angeles to Boulder (average of $197). Flying from Los Angeles to Boulder 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 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$56Average$205FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$84Average$98FlexibilityNo cancel feeOn-time88%
DeltaCheapest$116Average$238FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$141Average$288FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$142Average$304FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$154Average$366FlexibilityNo cancel feeOn-time69%

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