What is the cheapest month to fly to Boulder?

October is currently the cheapest month to fly to Boulder . At this moment in time March is the most expensive month. These prices are determined by multiple factors and booking in advance can help keep costs down if your schedule is not as flexible.

Can I find cheaper flights to Boulder if I am willing to have layovers?

Yes, flights with layovers are often cheaper than direct flights. Keep an eye out for flight deals to Boulder on Cheapflights that require 1 or 2 stops for potential cost savings.

What is the best airline to fly to Boulder?

Based on reviews from Cheapflights users, Frontier is rated the highest out of the airlines that fly to Boulder.

How much is a round-trip flight to Boulder?

A round-trip flight to Boulder will typically cost around $359, however they can be found for as little as $46.

Where does the fastest flight to Boulder depart from?

For those looking to save time traveling to Boulder, Colorado Springs offers the quickest one-way flight (0 hours 50 minutes).

Does Denver Intl have rental cars?

Yes. Those touching down at Denver Intl can take advantage of the rental car services offered upon their arrival.

Are there hotels close to Denver Intl?

Yes. Denver Intl has hotels nearby for those requiring accommodations. The Westin Denver International Airport is the closest property to Denver Intl (0.0 mi away from Denver Intl).

$97+ Cheap Flights to Boulder

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Flights to Boulder in 2025

Popular in	December
Cheapest in	September
Average price	$318
Round-trip from	$136
One-way from	$97

Highest demand for flights based on searches. 1% potential increase in price.

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2025

Search Deals

From New York to Denver Intl

Search Deals

One-way flight from New York to Boulder

Search Deals

Find flight deals to Boulder

Cheapest flights to Boulder
Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on August 20, 2025.

Wed 9/1710:56 pmLGA - DEN

Nonstop4h 08mFrontier

Wed 9/244:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$137

Fri 9/1210:56 pmLGA - DEN

Nonstop4h 08mFrontier

Fri 9/191:12 pmDEN - LGA

1 stop8h 45mFrontier

Deal found 8/19$138

Sat 9/2010:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2711:40 amDEN - LGA

1 stop22h 20mFrontier

Deal found 8/19$139

Wed 9/1710:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2011:40 amDEN - LGA

1 stop10h 17mFrontier

Deal found 8/19$140

Tue 9/26:30 amLGA - DEN

1 stop28h 50mFrontier

Sat 9/64:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$141

Fri 9/1910:56 pmLGA - DEN

Nonstop4h 08mFrontier

Tue 9/238:00 amDEN - LGA

1 stop10h 59mFrontier

Deal found 8/19$142

Wed 10/81:00 pmJFK - DEN

Nonstop4h 24mFrontier

Tue 10/1410:29 pmDEN - JFK

1 stop29h 01mFrontier

Deal found 8/18$142

Fri 9/2610:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2712:59 amDEN - LGA

1 stop7h 34mFrontier

Deal found 8/19$143

Mon 9/810:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 10/44:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$144

Fri 9/510:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/134:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$145

Tue 10/1410:55 pmLGA - DEN

Nonstop4h 13mFrontier

Tue 10/214:08 pmDEN - LGA

Nonstop3h 52mFrontier

Deal found 8/19$146

Wed 10/221:00 pmJFK - DEN

Nonstop4h 24mFrontier

Wed 10/2212:59 amDEN - JFK

1 stop9h 00mFrontier

Deal found 8/19$146

Best flights to Boulder
Discover carefully curated flight deals to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 20, 2025.

Wed 9/1010:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/1312:59 amDEN - LGA

1 stop7h 34mFrontier

Deal found 8/19$138

Fri 11/148:10 amJFK - DEN

Nonstop4h 42mDelta

Sun 11/166:30 amDEN - JFK

Nonstop3h 51mDelta

Deal found 8/19$177

Thu 11/137:30 amEWR - DEN

1 stop12h 20mHawaiian Airlines

Tue 11/187:00 amDEN - EWR

1 stop9h 29mHawaiian Airlines

Deal found 8/18$267

Thu 9/186:02 amEWR - DEN

2 stops13h 01mMultiple Airlines

Mon 9/227:48 pmDEN - EWR

1 stop13h 11mMultiple Airlines

Deal found 8/19$269

Thu 10/238:57 pmEWR - DEN

Nonstop4h 18mUnited Airlines

Wed 10/2911:45 amDEN - EWR

Nonstop3h 43mUnited Airlines

Deal found 8/17$272

Thu 9/410:56 pmLGA - DEN

Nonstop4h 08mFrontier

Fri 9/512:59 amDEN - LGA

1 stop7h 34mFrontier

Deal found 8/19$138

Fri 9/2610:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 10/412:59 amDEN - LGA

1 stop7h 34mFrontier

Deal found 8/19$138

Fri 9/1210:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/1311:40 amDEN - LGA

1 stop10h 17mFrontier

Deal found 8/19$138

Sat 9/611:30 amLGA - DEN

1 stop9h 32mFrontier

Mon 9/84:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/19$138

Fri 9/1910:56 pmLGA - DEN

Nonstop4h 08mFrontier

Wed 9/244:44 pmDEN - LGA

1 stop15h 49mFrontier

Deal found 8/19$138

Thu 10/1612:55 pmLGA - DEN

1 stop8h 31mFrontier

Tue 10/214:08 pmDEN - LGA

Nonstop3h 52mFrontier

Deal found 8/19$139

Sat 9/2010:56 pmLGA - DEN

Nonstop4h 08mFrontier

Fri 9/2612:04 amDEN - LGA

1 stop9h 57mFrontier

Deal found 8/19$142

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated August 20, 2025 and is based on user searches.

Sun 8/3110:50 pmLGA - DEN

Nonstop4h 20mFrontier

Sat 9/134:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$146

Tue 9/26:30 amLGA - DEN

1 stop28h 50mFrontier

Sat 9/64:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$141

Fri 9/510:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/134:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$145

Mon 9/810:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 10/44:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$144

Fri 9/1210:56 pmLGA - DEN

Nonstop4h 08mFrontier

Fri 9/191:12 pmDEN - LGA

1 stop8h 45mFrontier

Deal found 8/19$138

Wed 9/1710:56 pmLGA - DEN

Nonstop4h 08mFrontier

Wed 9/244:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$137

Wed 9/1710:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2011:40 amDEN - LGA

1 stop10h 17mFrontier

Deal found 8/19$140

Fri 9/1910:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2710:01 amDEN - LGA

1 stop8h 01mFrontier

Deal found 8/19$142

Sat 9/2010:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2711:40 amDEN - LGA

1 stop22h 20mFrontier

Deal found 8/19$139

Thu 9/2510:56 pmLGA - DEN

Nonstop4h 08mFrontier

Mon 9/294:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$147

Thu 9/2510:56 pmLGA - DEN

Nonstop4h 08mFrontier

Fri 9/264:14 pmDEN - LGA

Nonstop3h 57mFrontier

Deal found 8/18$148

Fri 9/2610:56 pmLGA - DEN

Nonstop4h 08mFrontier

Sat 9/2712:59 amDEN - LGA

1 stop7h 34mFrontier

Deal found 8/19$143

One-way flights to Boulder
Search for one-way flight options to Boulder. Find affordable one-way fares based on user searches. Data last updated August 20, 2025.

Wed 9/1012:45 pmJFK - DEN

1 stop10h 37mFrontier

Deal found 8/19$97

Fri 8/2910:50 pmLGA - DEN

Nonstop4h 20mFrontier

Deal found 8/19$97

Mon 11/171:08 pmJFK - DEN

1 stop9h 23mFrontier

Deal found 8/16$98

Mon 8/2511:00 pmLGA - DEN

Nonstop4h 10mFrontier

Deal found 8/17$98

Fri 9/122:59 pmJFK - DEN

1 stop6h 26mAmerican Airlines

Deal found 8/19$99

Wed 10/86:50 pmLGA - DEN

Nonstop4h 21mUnited Airlines

Deal found 8/19$99

Thu 9/411:00 amJFK - DEN

1 stop7h 43mAmerican Airlines

Deal found 8/19$100

Tue 9/1610:59 amLGA - DEN

2 stops24h 14mMultiple Airlines

Deal found 8/16$100

Tue 8/2612:30 pmJFK - DEN

1 stop9h 24mFrontier

Deal found 8/18$101

Tue 8/265:30 pmLGA - DEN

1 stop19h 30mFrontier

Deal found 8/17$101

Mon 10/201:00 pmJFK - DEN

Nonstop4h 24mFrontier

Deal found 8/17$102

Sat 10/116:35 amLGA - DEN

1 stop15h 24mFrontier

Deal found 8/19$102

Fly from

Route

Depart

Return

Price

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Wed 9/10

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Sat 9/13

12:59 am-10:33 am

1 stop7h 34m

$138

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Thu 9/4

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Fri 9/5

12:59 am-10:33 am

1 stop7h 34m

$138

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Fri 9/26

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Sat 10/4

12:59 am-10:33 am

1 stop7h 34m

$138

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Fri 9/12

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Sat 9/13

11:40 am-11:57 pm

1 stop10h 17m

$138

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Sat 9/6

11:30 am-7:02 pm

1 stop9h 32m

Denver Intl

Mon 9/8

4:14 pm-10:11 pm

Nonstop3h 57m

$138

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Fri 9/19

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Wed 9/24

4:44 pm-10:33 am

1 stop15h 49m

$138

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Thu 10/16

12:55 pm-7:26 pm

1 stop8h 31m

Denver Intl

Tue 10/21

4:08 pm-10:00 pm

Nonstop3h 52m

$139

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Sat 9/20

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Fri 9/26

12:04 am-12:01 pm

1 stop9h 57m

$142

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Fri 9/19

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Mon 9/22

6:10 am-8:59 pm

1 stop12h 49m

$142

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Thu 9/11

10:56 pm-1:04 am

Nonstop4h 08m

Denver Intl

Mon 9/15

6:10 am-8:59 pm

1 stop12h 49m

$142

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

Showing 1-10 of 60 results

...

Best time to book a flight to Boulder

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

When is the best time to book a flight to Boulder?

Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights to Boulder. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

How long is the flight to Boulder?

On average, a flight from New York to Boulder takes 6 hours 40 minutes. Flights to Boulder from other popular cities in USA will vary in length. Below are a few examples of popular routes and their flight times.

When is the cheapest time to fly to Boulder?

Users looking for the lowest fares to Boulder should consider flying on Saturday evenings, when prices are typically cheapest. Budget-minded travelers will want to avoid Sunday at noon, when prices are usually at their highest.

Weekly flight availability to Boulder

The most flights from New York to Boulder are scheduled on a Tuesday (61 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).

What are the most popular airlines that fly to Boulder?

The most popular airlines flying from New York to Boulder are United Airlines, Delta and JetBlue.

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from New York to Boulder are Frontier, JetBlue and Delta.

Rainfall in Boulder by month

In terms of precipitation, rainfall in Boulder ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Boulder when rainfall is around 0.5 in.

Temperature in Boulder by month

If weather is an important factor for your trip to Boulder, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Boulder

Read through reviews of airlines servicing the United States, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Southwest

8.0

Very good

4,246 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

8.0

Very good

7,982 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

United Airlines

7.4

Good

8,928 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

JetBlue

7.2

Good

2,916 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,207 reviews

Southwest

8.0

Very good

4,246 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

FAQs about flying to Boulder

Can I find cheaper flights to Boulder if I am willing to have layovers?
Yes, flights with layovers are often cheaper than direct flights. Keep an eye out for flight deals to Boulder on Cheapflights that require 1 or 2 stops for potential cost savings.
What is the best airline to fly to Boulder?
Based on reviews from Cheapflights users, Frontier is rated the highest out of the airlines that fly to Boulder.
How much is a round-trip flight to Boulder?
A round-trip flight to Boulder will typically cost around $359, however they can be found for as little as $46.
Where does the fastest flight to Boulder depart from?
For those looking to save time traveling to Boulder, Colorado Springs offers the quickest one-way flight (0 hours 50 minutes).
Does Denver Intl have rental cars?
Yes. Those touching down at Denver Intl can take advantage of the rental car services offered upon their arrival.
Are there hotels close to Denver Intl?
Yes. Denver Intl has hotels nearby for those requiring accommodations. The Westin Denver International Airport is the closest property to Denver Intl (0.0 mi away from Denver Intl).

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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$97+ Cheap flights to Boulder

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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights to Boulder with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Flights to Boulder in 2025

Find the latest flights to Boulder in 2025, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 2,558,603 searches and data was last updated on August 20, 2025.

Popular in

Cheapest in

Average price

Round-trip from

One-way from

Find flight deals to Boulder

Cheapest flights to BoulderExplore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on August 20, 2025.

Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on August 20, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights to Boulder that are best for you.

Best time to book a flight to Boulder

Have a flexible travel schedule? Discover the best time to fly to Boulder with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight to Boulder

When is the best time to book a flight to Boulder?

Use this chart to determine the optimal time to book a round-trip flight from New York to Boulder. Price data was last updated on August 8, 2025.

How long is the flight to Boulder?

When is the cheapest time to fly to Boulder?

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

Weekly flight availability to Boulder

What are the most popular airlines that fly to Boulder?

What are the cheapest airlines that fly to Boulder?

Rainfall in Boulder by month

Plan your trip to Boulder by taking into account the average rainfall totals by month.

Temperature in Boulder by month

Plan your trip to Boulder by taking into account the average temperature totals by month.

Reviews of airlines servicing Boulder

Read through reviews of airlines servicing the United States, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

FAQs about flying to Boulder

Can I find cheaper flights to Boulder if I am willing to have layovers?

What is the best airline to fly to Boulder?

How much is a round-trip flight to Boulder?

Where does the fastest flight to Boulder depart from?

Does Denver Intl have rental cars?

Are there hotels close to Denver Intl?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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Cheapest flights to Boulder
Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on August 20, 2025.