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$119+ Cheap flights from Boston (BOS) 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — DEN
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Boulder are usually found in January or November, booked 57 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Cheap flight deals from Boston to Boulder

Keep the following information in mind while searching for Boston to Boulder flight deals. Data was last updated June 12, 2025.

Round-trip from

$217
(Delta)

One-way from

$119
(American Airlines)

Popular in

February

Cheapest in

January

Average price

$333
From Boston Logan Intl to Boulder
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One-way flight from Boston Logan Intl to Boulder
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High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Boston to Boulder

Cheapest flights from Boston to Boulder
Explore the most affordable flight options available from Boston to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Delta deal was found by Cheapflights users on 6/9. 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.
Fri 7/118:25 pmBOS - DEN
Nonstop4h 39mDelta
Tue 7/1511:59 pmDEN - BOS
Nonstop4h 01mDelta
Deal found 6/9$217
This Frontier deal was found by Cheapflights users on 6/12. 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.
Thu 8/148:47 amBOS - DEN
1 stop12h 30mFrontier
Sun 8/179:15 pmDEN - BOS
1 stop11h 43mFrontier
Deal found 6/12$221
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/117:55 pmBOS - DEN
1 stop6h 45mSouthwest
Tue 7/156:10 pmDEN - BOS
Nonstop4h 05mSouthwest
Deal found 6/10$227
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/47:00 pmBOS - DEN
Nonstop4h 34mUnited Airlines
Tue 9/163:55 pmDEN - BOS
Nonstop4h 00mUnited Airlines
Deal found 6/10$232
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/229:20 amBOS - DEN
1 stop12h 12mAlaska Airlines
Sat 7/265:50 pmDEN - BOS
1 stop12h 10mAlaska Airlines
Deal found 6/10$236
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/105:29 pmBOS - DEN
1 stop7h 18mAmerican Airlines
Wed 7/1612:44 pmDEN - BOS
1 stop9h 00mAmerican Airlines
Deal found 6/12$238
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/19:01 amBOS - DEN
1 stop24h 15mAllegiant Air
Fri 8/86:44 pmDEN - BOS
1 stop12h 27mAllegiant Air
Deal found 6/10$250
This JetBlue deal was found by Cheapflights users on 6/10. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/85:05 pmBOS - DEN
1 stop7h 54mJetBlue
Thu 7/1710:39 pmDEN - BOS
Nonstop3h 56mJetBlue
Deal found 6/10$257
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/259:01 amBOS - DEN
1 stop24h 15mMultiple Airlines
Sun 7/277:00 amDEN - BOS
2 stops26h 31mMultiple Airlines
Deal found 6/10$320
This Sun Country Air deal was found by Cheapflights users on 6/11. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/46:30 amBOS - DEN
1 stop12h 11mSun Country Air
Fri 7/118:55 pmDEN - BOS
1 stop11h 42mSun Country Air
Deal found 6/11$350

Cheapflights Fare Finder

Customize your flight search to find flights from Boston 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 June 12, 2025.
Use the filters below to find and compare flights from Boston to Boulder that are best for you.

Fly from

Boston

Fly to

Boulder

Route

Depart

Return

Price

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Fri 7/11

8:25 pm-11:04 pm

Nonstop4h 39m

Denver Intl

Tue 7/15

11:59 pm-6:00 am

Nonstop4h 01m

$217

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Thu 8/14

8:47 am-7:17 pm

1 stop12h 30m

Denver Intl

Sun 8/17

9:15 pm-10:58 am

1 stop11h 43m

$221

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Fri 7/11

7:55 pm-12:40 am

1 stop6h 45m

Denver Intl

Tue 7/15

6:10 pm-12:15 am

Nonstop4h 05m

$227

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Thu 9/4

7:00 pm-9:34 pm

Nonstop4h 34m

Denver Intl

Tue 9/16

3:55 pm-9:55 pm

Nonstop4h 00m

$232

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Tue 7/22

9:20 am-7:32 pm

1 stop12h 12m

Denver Intl

Sat 7/26

5:50 pm-8:00 am

1 stop12h 10m

$236

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Thu 7/10

5:29 pm-10:47 pm

1 stop7h 18m

Denver Intl

Wed 7/16

12:44 pm-11:44 pm

1 stop9h 00m

$238

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Fri 8/1

9:01 am-7:16 am

1 stop24h 15m

Denver Intl

Fri 8/8

6:44 pm-9:11 am

1 stop12h 27m

$250

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Tue 7/8

5:05 pm-10:59 pm

1 stop7h 54m

Denver Intl

Thu 7/17

10:39 pm-4:35 am

Nonstop3h 56m

$257

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Fri 7/25

9:01 am-7:16 am

1 stop24h 15m

Denver Intl

Sun 7/27

7:00 am-11:31 am

2 stops26h 31m

$320

BostonDenver

BOS - DEN

BOSDEN

Boston Logan Intl

Fri 7/4

6:30 am-4:41 pm

1 stop12h 11m

Denver Intl

Fri 7/11

8:55 pm-10:37 am

1 stop11h 42m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 20 results
1
2

Best time to book a flight from Boston to Boulder

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

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

Use this chart to determine the optimal time to book a round-trip flight from Boston to Boulder. Price data was last updated on June 9, 2025.

To ensure you get the cheapest price possible for a flight from Boston to Boulder, you should look to book at least 57 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, October is the cheapest month in which you can book a flight from Boston to Boulder (average of $197). Flying from Boston 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 BOS to BD9?

Find hourly flight availability from Boston 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 June 12, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Boston to Boulder as you normally would.

What is the cheapest day to fly from Boston to Boulder?

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

Travelers seeking maximum savings on their Boston 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 Boston to Boulder

Explore weekly flight availability from Boston 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 June 12, 2025.

The most flights from BOS to BD9 are scheduled on a Thursday (19 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).

Rainfall in Boulder by month

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

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

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 June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Boston to Boulder to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

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

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

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
2,925 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

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 Boston 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 Boston to Boulder?

    For a flight from Boston to Boulder, you will be flying from Logan Intl. Boston Logan Intl (BOS) is just 2.6 mi from the center of the city. Logan Intl is the only Boston airport and it handles 14 outbound flights to Boulder per day. 9 airlines have flights to Boulder from Boston Logan Intl on a regular basis.

  • How popular is this Boston to Boulder flight route?

    Flights from Boston Logan Intl to Boulder have been viewed 68 times in the past calendar month.

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

    One-way options have recently been found by users for as low as $119 on American Airlines. Other airlines that offer cheap prices include Frontier from $121 and Allegiant Air from $125 one-way.

  • What are the most reliable airlines from Boston to Boulder?

    Consider Air France (81%), Virgin Atlantic (81%) or Qatar Airways (75%) when booking your flight. These represent the most reliable airlines when flying from Boston to Boulder.

  • What are the cheapest flights from Boston to Boulder?

    Looking for the cheapest flight from Boston to Boulder? While on average our users pay $776, our data indicates the cheapest price to be $118. The most popular route (Boston Logan Intl - Denver Intl), is priced around $177.

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

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

  • How can I find direct flights from Boston to Boulder?

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

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

    Yes. Cheapflights offers flight deals from Boston 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 Boston to Boulder?

    Currently, October is the cheapest month in which you can book a flight from Boston to Boulder (average of $197). Flying from Boston 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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Alternative routes for Boston to Boulder

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Boston to Boulder

Discover the top 9 airlines that operate flights from Boston 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Breeze AirwaysCheapest$79Average$184FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$106Average$174FlexibilityNo cancel feeOn-time62%
DeltaCheapest$114Average$310FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$121Average$286FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$144Average$269FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$191Average$453FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$196Average$373FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$196Average$344FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$255Average$331FlexibilityNo cancel feeOn-time75%

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