Boulder

Cheap flights from Los Angeles (LAX) to Boulder, CO

LAX — DEN
Dec 4 — Dec 111
We work with more than 300 partners to bring you better travel deals

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

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Los Angeles to Boulder are usually found in February or January, booked 53 days in advance, depart on a Saturday or Wednesday and return on a Thursday

Find flight deals from Los Angeles to Boulder

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Popular in

July

Cheapest in

February

Average price

$262
Provider with most accurate pricing for Los Angeles-Denver Intl flight deals.
Provider most trusted by Cheapflights users for Los Angeles-Denver Intl flights.
Highest demand for flights based on searches. 10% potential increase in price ($28 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Average for round-trip flights in November 2026

Cheapflights Insights

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

What is the cheapest time of day to fly from LAX to BD9?

Unlike in the morning, when flights are generally more expensive, you can save up to 16% 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?

Travelers seeking maximum savings on their Los Angeles to Boulder flight should consider departing on Wednesday 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.

Reviews of airlines servicing Boulder

Get a feel of what it's like to fly with Southwest,Delta, andUnited 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.

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

Related info for your journey

  • 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 57 daily outbound flights to Boulder from 7 different airlines.

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

  • 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 $29. Users have also found prices from $78 and $78 on Southwest and Delta, 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: United Airlines (92%), Asiana Airlines (92%), LATAM Airlines (92%).

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

    While on average a flight from Los Angeles to Boulder is generally $746, our data shows the cheapest flight currently is $82. When looking at the most popular route, (Los Angeles - Denver Intl), you can expect to pay $47 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Los Angeles to Boulder

Top 7 airlines flying from Los Angeles to Boulder

AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$190FlexibilityNo cancel feeOn-time62%
DeltaCheapest$99Average$280FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$139Average$245FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$157Average$343FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$169Average$370FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$170Average$323FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$300Average$541FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.