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 $272, however they can be found for as little as $82.

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).

$105+ Flights to Boulder

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Flights to Boulder in 2025

Popular in	December
Cheapest in	September
Average price	$312
Round-trip from	$170
One-way from	$108

Highest demand for flights based on searches. 0% 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 July 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 July 3, 2025.

Fri 7/2510:55 pmLGA - DEN

Nonstop4h 20mFrontier

Wed 7/304:14 pmDEN - LGA

Nonstop3h 55mFrontier

Deal found 7/3$169

Sat 8/306:00 amJFK - DEN

1 stop10h 18mFrontier

Fri 9/1212:59 amDEN - JFK

1 stop9h 03mFrontier

Deal found 7/2$170

Wed 8/278:10 amJFK - DEN

Nonstop4h 15mJetBlue

Sat 8/3011:54 pmDEN - JFK

Nonstop3h 46mJetBlue

Deal found 7/3$197

Tue 8/196:00 pmLGA - DEN

Nonstop4h 38mDelta

Wed 8/206:25 amDEN - LGA

Nonstop3h 47mDelta

Deal found 7/3$197

Thu 8/289:55 pmLGA - DEN

Nonstop4h 15mSouthwest

Tue 9/26:30 amDEN - LGA

Nonstop3h 40mSouthwest

Deal found 7/1$207

Fri 8/293:59 pmJFK - DEN

Nonstop4h 47mDelta

Tue 9/1611:59 pmDEN - JFK

Nonstop4h 01mDelta

Deal found 7/3$212

Sat 9/63:00 pmJFK - DEN

1 stop9h 07mAmerican Airlines

Sat 9/139:30 amDEN - JFK

1 stop5h 47mAmerican Airlines

Deal found 7/2$217

Wed 7/305:00 amEWR - DEN

1 stop6h 08mAmerican Airlines

Sat 8/211:59 pmDEN - EWR

1 stop7h 55mAmerican Airlines

Deal found 7/3$247

Sat 8/911:01 amEWR - DEN

1 stop12h 16mFrontier

Mon 8/1112:59 amDEN - EWR

1 stop7h 09mFrontier

Deal found 7/1$248

Tue 7/1512:00 pmEWR - DEN

Nonstop4h 18mUnited Airlines

Mon 9/226:00 amDEN - EWR

Nonstop3h 44mUnited Airlines

Deal found 7/1$253

Tue 9/26:00 amEWR - DEN

1 stop5h 36mDelta

Tue 9/164:00 pmDEN - EWR

1 stop5h 27mDelta

Deal found 7/3$258

Wed 8/1311:39 amEWR - DEN

1 stop8h 22mMultiple Airlines

Thu 8/1412:59 amDEN - EWR

1 stop7h 09mMultiple Airlines

Deal found 7/1$271

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 July 3, 2025.

Sat 8/306:00 amJFK - DEN

1 stop10h 18mFrontier

Fri 9/1212:59 amDEN - JFK

1 stop9h 03mFrontier

Deal found 7/2$170

Wed 8/278:14 pmJFK - DEN

Nonstop4h 45mJetBlue

Sat 8/3011:54 pmDEN - JFK

Nonstop3h 46mJetBlue

Deal found 7/2$197

Tue 8/196:00 pmLGA - DEN

Nonstop4h 38mDelta

Wed 8/276:25 amDEN - LGA

Nonstop3h 47mDelta

Deal found 7/1$197

Thu 8/289:55 pmLGA - DEN

Nonstop4h 15mSouthwest

Tue 9/26:30 amDEN - LGA

Nonstop3h 40mSouthwest

Deal found 7/1$207

Sat 9/63:00 pmJFK - DEN

1 stop9h 07mAmerican Airlines

Sat 9/139:30 amDEN - JFK

1 stop5h 47mAmerican Airlines

Deal found 7/2$217

Tue 7/1512:00 pmEWR - DEN

Nonstop4h 18mUnited Airlines

Mon 9/226:00 amDEN - EWR

Nonstop3h 44mUnited Airlines

Deal found 7/1$253

Wed 8/1311:39 amEWR - DEN

1 stop8h 22mMultiple Airlines

Thu 8/1412:59 amDEN - EWR

1 stop7h 09mMultiple Airlines

Deal found 7/1$271

Wed 9/36:30 amLGA - DEN

1 stop7h 03mFrontier

Sun 9/1412:59 amDEN - LGA

1 stop7h 34mFrontier

Deal found 7/2$170

Thu 8/78:03 pmSWF - DEN

2 stops23h 51mAllegiant Air

Sun 8/105:42 pmDEN - SWF

2 stops23h 24mAllegiant Air

Deal found 7/2$344

Wed 8/205:00 amEWR - DEN

1 stop7h 06mAmerican Airlines

Tue 8/266:10 amDEN - EWR

2 stops8h 29mAmerican Airlines

Deal found 7/2$252

Tue 9/26:52 pmEWR - DEN

1 stop6h 17mDelta

Tue 9/96:15 amDEN - EWR

1 stop5h 44mDelta

Deal found 7/2$258

Sat 8/911:01 amEWR - DEN

1 stop12h 16mFrontier

Mon 8/1112:59 amDEN - EWR

1 stop7h 09mFrontier

Deal found 7/1$248

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated July 3, 2025 and is based on user searches.

Wed 7/911:04 amEWR - DEN

1 stop12h 13mFrontier

Tue 7/151:39 pmDEN - EWR

1 stop9h 05mFrontier

Deal found 7/2$288

Thu 7/1010:55 pmLGA - DEN

Nonstop4h 20mFrontier

Fri 7/184:14 pmDEN - LGA

Nonstop3h 55mFrontier

Deal found 7/1$171

Thu 7/109:10 pmEWR - DEN

Nonstop4h 21mUnited Airlines

Wed 7/307:11 pmDEN - EWR

Nonstop3h 49mUnited Airlines

Deal found 7/3$323

Thu 7/106:50 pmEWR - DEN

1 stop6h 38mDelta

Wed 7/2312:55 amDEN - EWR

1 stop6h 05mDelta

Deal found 7/2$343

Sat 7/1211:30 amJFK - DEN

1 stop7h 47mFrontier

Sat 7/1911:58 pmDEN - JFK

1 stop8h 17mFrontier

Deal found 7/1$190

Sat 7/1211:45 amEWR - DEN

1 stop11h 11mMultiple Airlines

Mon 7/1412:59 amDEN - EWR

1 stop7h 10mMultiple Airlines

Deal found 7/1$333

Tue 7/1512:00 pmEWR - DEN

Nonstop4h 18mUnited Airlines

Mon 9/226:00 amDEN - EWR

Nonstop3h 44mUnited Airlines

Deal found 7/1$253

Fri 7/2510:55 pmLGA - DEN

Nonstop4h 20mFrontier

Wed 7/304:14 pmDEN - LGA

Nonstop3h 55mFrontier

Deal found 7/3$169

Wed 7/305:00 amEWR - DEN

1 stop6h 08mAmerican Airlines

Sat 8/211:59 pmDEN - EWR

1 stop7h 55mAmerican Airlines

Deal found 7/3$247

Sat 8/911:01 amEWR - DEN

1 stop12h 16mFrontier

Mon 8/1112:59 amDEN - EWR

1 stop7h 09mFrontier

Deal found 7/1$248

Wed 8/132:57 pmJFK - DEN

1 stop6h 51mAmerican Airlines

Wed 8/201:08 pmDEN - JFK

1 stop6h 51mAmerican Airlines

Deal found 7/3$217

Wed 8/1311:39 amEWR - DEN

1 stop8h 22mMultiple Airlines

Thu 8/1412:59 amDEN - EWR

1 stop7h 09mMultiple Airlines

Deal found 7/1$271

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 July 3, 2025.

Tue 7/1512:59 pmLGA - DEN

1 stop8h 26mFrontier

Deal found 7/2$108

Tue 8/196:59 amJFK - DEN

1 stop7h 14mAmerican Airlines

Deal found 7/3$109

Mon 9/16:59 amJFK - DEN

1 stop18h 12mFrontier

Deal found 7/2$111

Tue 7/298:10 amJFK - DEN

Nonstop4h 15mJetBlue

Deal found 7/1$119

Thu 8/78:42 amLGA - DEN

1 stop12h 33mMultiple Airlines

Deal found 7/2$120

Mon 8/253:59 pmJFK - DEN

Nonstop4h 47mDelta

Deal found 7/2$124

Fri 7/186:05 pmLGA - DEN

1 stop7h 39mAmerican Airlines

Deal found 7/2$124

Sat 8/239:30 amLGA - DEN

2 stops9h 10mSouthwest

Deal found 7/2$129

Fri 9/1211:33 amJFK - DEN

1 stop7h 58mSun Country Air

Deal found 7/2$150

Fri 7/186:30 pmLGA - DEN

1 stop6h 52mUnited Airlines

Deal found 7/1$159

Fri 8/81:55 pmEWR - DEN

2 stops19h 21mMultiple Airlines

Deal found 7/3$175

Sun 9/2811:15 amEWR - DEN

2 stops14h 27mFrontier

Deal found 7/3$177

Cheapflights Fare Finder

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

Fly from

Route

Depart

Return

Price

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Fri 7/25

10:55 pm-1:15 am

Nonstop4h 20m

Denver Intl

Wed 7/30

4:14 pm-10:09 pm

Nonstop3h 55m

$169

New YorkDenver

JFK - DEN

JFKDEN

New York John F Kennedy Intl

Sat 8/30

6:00 am-2:18 pm

1 stop10h 18m

Denver Intl

Fri 9/12

12:59 am-12:02 pm

1 stop9h 03m

$170

New YorkDenver

JFK - DEN

JFKDEN

New York John F Kennedy Intl

Wed 8/27

8:10 am-10:25 am

Nonstop4h 15m

Denver Intl

Sat 8/30

11:54 pm-5:40 am

Nonstop3h 46m

$197

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Tue 8/19

6:00 pm-8:38 pm

Nonstop4h 38m

Denver Intl

Wed 8/20

6:25 am-12:12 pm

Nonstop3h 47m

$197

New YorkDenver

LGA - DEN

LGADEN

New York LaGuardia

Thu 8/28

9:55 pm-12:10 am

Nonstop4h 15m

Denver Intl

Tue 9/2

6:30 am-12:10 pm

Nonstop3h 40m

$207

New YorkDenver

JFK - DEN

JFKDEN

New York John F Kennedy Intl

Fri 8/29

3:59 pm-6:46 pm

Nonstop4h 47m

Denver Intl

Tue 9/16

11:59 pm-6:00 am

Nonstop4h 01m

$212

New YorkDenver

JFK - DEN

JFKDEN

New York John F Kennedy Intl

Sat 9/6

3:00 pm-10:07 pm

1 stop9h 07m

Denver Intl

Sat 9/13

9:30 am-5:17 pm

1 stop5h 47m

$217

NewarkDenver

EWR - DEN

EWRDEN

Newark

Wed 7/30

5:00 am-9:08 am

1 stop6h 08m

Denver Intl

Sat 8/2

11:59 pm-9:54 am

1 stop7h 55m

$247

NewarkDenver

EWR - DEN

EWRDEN

Newark

Sat 8/9

11:01 am-9:17 pm

1 stop12h 16m

Denver Intl

Mon 8/11

12:59 am-10:08 am

1 stop7h 09m

$248

NewarkDenver

EWR - DEN

EWRDEN

Newark

Tue 7/15

12:00 pm-2:18 pm

Nonstop4h 18m

Denver Intl

Mon 9/22

6:00 am-11:44 am

Nonstop3h 44m

$253

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 32 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 9 hours 6 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 Monday (58 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 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 Alaska Airlines, Southwest, and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

10,000 reviews

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

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

4,266 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

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

7,982 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

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

8,861 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

JetBlue

7.3

Good

2,916 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 $272, however they can be found for as little as $82.
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

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$105+ 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 7/28. 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 July 3, 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 July 3, 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 July 3, 2025.

Cheapflights Fare Finder

Locate flights to Boulder that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 2,558,603 searches and data was last updated on July 3, 2025.

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 June 27, 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 June 30, 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 Alaska Airlines, Southwest, and Delta. 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.

Search flights to Boulder by cabin class

Find flights to Boulder, based on your preferred cabin class, be it economy, premium economy, business, or first class.

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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 July 3, 2025.