$94 Find Cheap Flights from Boston to Boulder

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Boulder departing on 2/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$177
Overall average: $257
Delta
Thu 1/15Sun 1/18
BOS - DEN • Non-stop
Cheapest one-way
$94
Typical prices: $132-$283
Multiple Airlines
Wed 2/18
BOS - DEN • 1 stop
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Boston to Boulder (BOS-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Boulder that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boston to Boulder

Thu, Jan 15 - Sun, Jan 18
Delta Logo
7:20 am - 10:24 am
BOS
-
DEN
5h 04mnonstop
Delta Logo
11:38 am - 5:35 pm
DEN
-
BOS
3h 57mnonstop
$177Delta
Thu, Jan 8 - Tue, Jan 13
Multiple Airlines Logo
6:00 am - 5:59 pm
BOS
-
DEN
13h 59m2 stops
Multiple Airlines Logo
11:59 pm - 4:19 pm
DEN
-
BOS
14h 20m1 stop
$178Multiple Airlines
Tue, Feb 3 - Wed, Feb 11
Multiple Airlines Logo
6:00 am - 12:19 pm
BOS
-
DEN
8h 19m1 stop
Multiple Airlines Logo
12:59 am - 2:38 pm
DEN
-
BOS
11h 39m2 stops
$179Multiple Airlines
Mon, Jan 12 - Tue, Jan 13
Multiple Airlines Logo
10:48 am - 5:14 pm
BOS
-
DEN
8h 26m1 stop
Multiple Airlines Logo
1:40 pm - 7:33 pm
DEN
-
BOS
3h 53mnonstop
$180Multiple Airlines
Mon, Jan 12 - Fri, Jan 16
Multiple Airlines Logo
10:48 am - 5:14 pm
BOS
-
DEN
8h 26m1 stop
Multiple Airlines Logo
6:05 am - 11:19 pm
DEN
-
BOS
15h 14m2 stops
$181Multiple Airlines
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
6:00 am - 12:21 pm
BOS
-
DEN
8h 21m1 stop
Frontier Logo
1:42 pm - 1:19 am
DEN
-
BOS
9h 37m1 stop
$182Frontier
Tue, Jan 6 - Mon, Jan 12
Multiple Airlines Logo
6:00 am - 11:26 am
BOS
-
DEN
31h 26m2 stops
Multiple Airlines Logo
6:00 am - 4:19 pm
DEN
-
BOS
32h 19m1 stop
$183Multiple Airlines
Wed, Jan 7 - Tue, Jan 13
Multiple Airlines Logo
12:29 pm - 10:59 pm
BOS
-
DEN
12h 30m1 stop
Multiple Airlines Logo
11:59 pm - 4:19 pm
DEN
-
BOS
14h 20m1 stop
$184Multiple Airlines
Sun, Jan 11 - Fri, Jan 16
Frontier Logo
8:48 am - 9:49 pm
BOS
-
DEN
15h 01m1 stop
Frontier Logo
6:13 pm - 1:13 am
DEN
-
BOS
29h 00m1 stop
$185Frontier
Mon, Jan 5 - Tue, Jan 13
Multiple Airlines Logo
12:45 pm - 9:41 pm
BOS
-
DEN
10h 56m1 stop
Multiple Airlines Logo
12:05 am - 1:13 am
DEN
-
BOS
23h 08m1 stop
$186Multiple Airlines
Useful Info

Good to know

Low seasonNovember
Cheapest flight$94
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 13% increase in price.
Flight from Boston to Denver

When to book flights from Boston to Boulder

Are your dates flexible? Find out the best times to travel from Boston to Boulder based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

FAQs for booking flights from Boston to Boulder

  • Which airports will I be using when flying from Boston to Boulder?

    When flying out of Boston you’ll be using Boston Logan Intl. Boulder does not have its own airport so you’ll be flying into nearby Denver Intl airport, which is 33.4 mi away.

  • How long does a flight from Boston to Boulder take?

    Direct flights cover the 1,748 miles separating Boston and Boulder in about 4h 40m.

  • How many flights are there between Boston and Boulder?

    19 direct flights run between Boston and Boulder on a daily basis. On average, there are about 139 departures each week.

  • What’s the cheapest day of the week to fly between Boston and Boulder?

    Consider leaving on a Tuesday and avoid Sundays if you are looking for the best rates. For your return to Boston, you’ll find the best rates on Saturdays and the most expensive ones on Sundays.

  • How does KAYAK find such low prices on flights from Boston to Boulder?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Boulder.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Boulder?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boulder from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Boulder?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boulder with an airline and back to Boston with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Boulder?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boulder from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from Boston to Boulder?

    In the last 72 hours, the cheapest one-way ticket between Boston and Boulder found on KAYAK was with Frontier for $53. Frontier offered a round-trip connection from $99 and Delta from $108.

Top tips for finding cheap flights from Boston to Boulder

  • There is no airport in Boulder. Instead, you’ll be flying into Denver Airport when flying between Boston and Boulder.
  • The cheapest flight from Boston to Boulder was found 87 days before departure, on average.
  • Book at least 2 weeks before departure in order to get a below-average price.
  • High season is considered to be January, February and March. The cheapest month to fly is January.

Reviews of the top 5 airlines serving Boston to Boulder

 
Need help choosing which airline to fly with from Boston to Boulder? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4250 reviews
7.0Food
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
Airline reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

2.0 MediocreRobert, Dec 2025
LAS - TPA
Read more Southwest reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

No delays and arrived to destination 30 min early. Staff was super friendly.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

It was rough. The staff was unprofessional, the choice of on board drinks terrible, it was cramped in space at every airport, they always ran out of overhead bin space so they pressured people to check bags for free or we couldn’t leave on the plane— so I did check my bag to help, and they nearly lost my bag. My bag did not arrive on the luggage belt, another man on my flight and I had to waste our time going to the baggage office to search for our bags. I would only fly southwest again if it was my last choice. Also, my flights were consistently delayed over and over again— at one point they straight up told us we were waiting for the pilot to arrive.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Had to get off plane from prior flight even though I had to reboard same plane to continue to my final destination.

Original flight was cancelled and when i was rebooked by the airline, they couldn't seat me in the same type of seat as I had originally booked (went from window/aisle to middle/middle and one was a bulkhead seat, and other wasn't in the same class)

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The entertainment available didn’t work for anyone on the flight. Long 6 hr flight with no entertainment option and the staff didn’t know until an hour into the flight when we made sure they knew about it. They had no way to fix it.

Late FA meant slow boarding. WiFi did not work. I’m a medium plus sized passenger. The seatbelt was for the first time ever barely fitting. And we delayed on the tarmac 40 min

My husband and I had boarded the flight from Denver to Chicago, and one of the last passengers to get on the plane opened the overhead bin above my husband's seat and threw his bag out of the bin to make space for his own. He said, "Mine is bigger!" The flight attendant supported the new passenger. They didn't care that my husband has two artificial knees and must have the foot room in front of his seat to be able to fit his legs in -- and to be able to stand, much less walk, at the end of the flight. I have never seen this happen before, and it was a disaster.

Terrible. They wouldn't allow me on my flight on the 14th..

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

The service was good, the food could have been better.

The ride share experience in JFK is terrible. After traveling on a flight, then you need to take a subway to the last stop to get an uber or lyft. Unacceptable. Bad job JetBlue for permitting JFK and Port Authority to do this to your passengers.

Checking In on JetBlue site was impossible. It hung up on REAL ID. Even my Global Entry did not help. Luckily, on Kayak site it was a breeze. Entire flight the temperature was COLD! Otherwise the crew was great!

The flight was two hours late due to a computer fault and resulting maintenance. Nothing was offered as compensation beyond bottles of water during the time we were deplaned and waiting in the terminal.

Very pleasant flight attendants. Gate crew rather loud chatting with each other.

Four plus hour flight delay in New York caused us to take off after 11:30pm. We didn’t arrive at our hotel until five hours after check in. Started the trip off feeling exhausted.

Plane was in bad shape. TV’s and WiFi didn’t work. Plane need a refresh. Not enough room for bags.

Everything was great. I liked the text updates so that I never miss a gate change & I have all the latest info.

I don’t usually fly budget airlines or airlines in the United States. It was as good as any other airline. The seats are comfortable and the airline attendants are not rude & surly. Very nice flight (s).

They have the most inexperienced / rude flight staff I’ve encountered

very difficult boarding process - aggressive passengers not the friendliest crew

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

First of all, we never got on the connecting flight to Denver. They delayed our flight for two hours. If we would have gotten on that flight, we would have been stuck in Denver for 13 hours. So we re- routed our flight for a straight through flight to Oklahoma two days later. THEN, they delayed that flight for two hours. After that we were able to finally get on our flight and come home. Frontier Airlines - one of the worst airlines I have ever been on.

Terrible communication with weather delay, lost baggage, near impossible to reach customer service

My tickets got canceled on me by your site and I didn't have a flight. Then you kept sending me emails on the status of q flight I didn't have tickets for.

Flight was late. Missed connecting in Denver. My new flight is more than 24 hours later and I have no room, vouchers, or compensation, and might also be bumped from the one tomorrow.

Everything you need to know for your flight from Boston to Boulder

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