$20 Cheap flights to Boulder County

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Top places to visit in Boulder County

A street corner with a traffic light, a street sign reading "Pearl St Mall 1900", and a brick building with multiple windows.
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Boulder

Boulder
A snow-capped mountain range with a visible moon in the sky.
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Longmont

Longmont
A historic stone building with a reflection in calm water, surrounded by a fence and trees.
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FlightsFlights

Louisville

Louisville

Cheap flights to Boulder County from $20 One Way, $40 Round Trip

$40 return flights and $20 one-way flights to Boulder County were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Feb 23 - Sat, Feb 27
DFW
Dallas
DEN
Denver
$40 Roundtrip, found 4 hours ago
$40
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Feb 23 from Dallas to Denver, returning Sat, Feb 27, priced at $40 found 4 hours ago
Sun, Nov 8 - Wed, Nov 11
MSP
Minneapolis
DEN
Denver
$62 Roundtrip, found 2 days ago
$62
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sun, Nov 8 from Minneapolis to Denver, returning Wed, Nov 11, priced at $62 found 2 days ago
Fri, Nov 6 - Fri, Nov 13
IAH
Houston
DEN
Denver
$63 Roundtrip, found 2 days ago
$63
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Nov 6 from Houston to Denver, returning Fri, Nov 13, priced at $63 found 2 days ago
Sat, Nov 14 - Sun, Nov 15
ORD
Chicago
DEN
Denver
$72 Roundtrip, found 2 days ago
$72
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Sat, Nov 14 from Chicago to Denver, returning Sun, Nov 15, priced at $72 found 2 days ago
Tue, Oct 27 - Fri, Oct 30
MSP
Minneapolis
DEN
Denver
$117 Roundtrip, just found
$117
Roundtrip
just found
Select Sun Country Airlines flight, departing Tue, Oct 27 from Minneapolis to Denver, returning Fri, Oct 30, priced at $117 just found
Wed, Oct 28 - Sat, Oct 31
DAL
Dallas
DEN
Denver
$134 Roundtrip, found 2 days ago
$134
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Oct 28 from Dallas to Denver, returning Sat, Oct 31, priced at $134 found 2 days ago

Deals For This Weekend's Flights

OriginDestinationTravel DatesFlights From*
MSPDenverOctober 17 to October 21$198
PHXDenverOctober 18 to October 21$238
DFWDenverOctober 16 to October 20$287
MIADenverOctober 17 to October 17$310
ORDDenverOctober 17 to October 21$330
LAXDenverOctober 18 to October 20$332
ATLDenverOctober 18 to November 7$370
PHLDenverOctober 17 to October 18$394
EWRDenverOctober 16 to October 23$408
BOSDenverOctober 16 to October 18$469
*Prices include taxes and fees

Find The Perfect Hotel For After Your Flight

Score Epic Boulder County Accommodation Deals

Hotel Boulderado

Hotel Boulderado

4 out of 5
2115 13th St Boulder CO
Fully refundableReserve now, pay when you stay
$163 nightly
The price is $187 total per night from Nov 2 to Nov 3
$187 total
Nov 2 - Nov 3
Total with taxes and fees
Book a stay at this luxury hotel in Boulder. Enjoy free WiFi, 2 restaurants, and breakfast (surcharge). Our guests praise the restaurant and the bar in our reviews. ...
9.6/10 Exceptional! (1,819 reviews)
"Had a great stay the room was beautiful and clean. Loved being right in the downtown area close to restaurants and shopping. Our favorite stay of our trip."

Reviewed on Oct 10, 2026

Opens in a new windowHotel Boulderado
Limelight Boulder

Limelight Boulder

4 out of 5
1295 University Ave Boulder CO
Fully refundableReserve now, pay when you stay
$209 nightly
The price is $240 total per night from Nov 1 to Nov 2
$240 total
Nov 1 - Nov 2
Total with taxes and fees
Book a stay at this family-friendly hotel in Boulder. Enjoy free WiFi, 2 bars/lounges, and a rooftop terrace. Popular attractions Pearl Street Mall and Folsom ...
9.8/10 Exceptional! (407 reviews)
"Great stay. Looking forward to the next."

Reviewed on Oct 9, 2026

Opens in a new windowLimelight Boulder
Hotel Longmont

Hotel Longmont

3 out of 5
508 3rd Ave Longmont CO
Fully refundable
$125 nightly
The price is $141 total per night from Oct 25 to Oct 26
$141 total
Oct 25 - Oct 26
Total with taxes and fees
Stay at this hotel in Longmont. Enjoy free WiFi, breakfast (surcharge), and parking (surcharge). Popular attractions Wibby Brewing and City of Longmont Callahan ...
9.8/10 Exceptional! (90 reviews)
"This is a brand new hotel in downtown Longmont. The lobby and reception area are world class beautifully decorated. My room was spacious and had everything you needed including a refrigerator and coffee machine. There also was a gym and a restaurant."

Reviewed on Oct 9, 2026

Opens in a new windowHotel Longmont
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Comfort Inn & Suites Boulder

Comfort Inn & Suites Boulder

3 out of 5
4777 North Broadway Boulder CO
Fully refundable
$110 nightly
The price is $126 total per night from Nov 1 to Nov 2
$126 total
Nov 1 - Nov 2
Total with taxes and fees
Book a stay at this business-friendly hotel in Boulder. Enjoy free breakfast, free WiFi, and an outdoor pool. Our guests praise the breakfast and the helpful ...
Opens in a new windowComfort Inn & Suites Boulder
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.

Need a Car For After Your Flight?

Special SUV

Jeep Wrangler
  • 5 people
  • Unlimited mileage
COMMERCE CITY, USA
Jeep Wrangler

$0

$44 total
found 3 days ago
Special SUV Jeep Wrangler

Compact SUV

Kia Seltos
  • 5 people
  • Unlimited mileage
COMMERCE CITY, USA
Kia Seltos

$5

$56 total
found 3 days ago
Compact SUV Kia Seltos

Fullsize

Nissan Altima
  • 5 people
  • Unlimited mileage
Commerce City, Colorado, USA
Nissan Altima

$11

$57 total
found 3 days ago
Fullsize Nissan Altima

Economy

Chevy Spark
  • 4 people
  • Unlimited mileage
Commerce City, Colorado, USA
Chevy Spark

$11

$56 total
found 3 days ago
Economy Chevy Spark
Lowest prices found within the past 3 days. Prices and availability subject to change. Additional terms may apply.

Boulder County

If you are looking for discount prices on flights to Boulder County then look no further than Orbitz. With some of the best deals available, cutting-edge technology, and great customer service, Orbitz makes booking Boulder County flights easy and affordable.

Booking Made Easy

With Orbitz’s Display Matrix, booking flights to Boulder County is simple. Just one glance gives you all the pricing information you need, including your discounts and savings. View all your options before selecting and booking your perfect Boulder County flights.

Manage Travel Plans on the Move

By using Orbitz’s free apps for iPhone and Android, and an easy-to-use mobile browser at m.orbitz.com, booking flights to Boulder County has never been so convenient. Check for updates and alerts wherever you are, or manage your booking quickly. And we also offer mobile exclusive deals on hotels, so don’t delay—book right away.

The Complete Package

Orbitz makes it stress-free to book Boulder County flights, and we can also help you figure out the rest of your trip just as easily. If you need great deals on hotels and car rentals following your flights to Boulder County, just add the details to your booking and search for the cheapest deals out there. And why waste time lining up for admission to attractions and events? With Orbitz, you can book tickets in advance and waltz straight in.

Low Price Guarantee

Booking your Boulder County flights with Orbitz guarantees low prices every day, all day—no matter when and where you book. You will always find the best deals available, coupled with extra great savings and discounts for all around great value.

Frequently asked questions

Which airlines fly to Boulder County?
With 12 airlines waiting to spirit you away to Boulder County, finding a suitable flight will be a breeze. Book your fare with one of these top carriers that offer services to Denver Intl. Airport (DEN):

  • United Airlines - 269 flights to Boulder County per month
  • Southwest Airlines - 88 flights to Boulder County per month
  • Air Canada - 83 flights to Boulder County per month

How much is a flight to Boulder County?
If you're searching for flights back and forth, airfares ranged between $40 and $469 this past week. The lowest one-way ticket prices were $20, departing from Dallas (DFW).
How to book the cheapest flight to Boulder County?
With Orbitz, you'll find some of the most amazing flight deals around from a big range of airlines. But if you'd like to increase your chances of landing cheap flights to Boulder County, here are some suggestions we think will help:

  • Taking off from or arriving at other airports can sometimes be cheaper. Enter your preferred departure and arrival airports. Next, select the 'Nearby airports' function below to explore your options.
  • Also, click on the 'Show flexible dates' link to bring up the prices for days around your chosen departure. It's possible to score cheaper flight deals if you're flexible with your schedule.
  • To filter your results, hit 'Show options.' You can search based on airlines, seating class, nonstop flights and refundable flights. You can also choose your preferred flight times under 'Sort & Filter' to the left.
  • The early bird catches the best deals, so purchase your seats once you've settled on your travel dates. The most affordable airfares sell like hotcakes and prices normally climb as the departure date nears.
  • Bundle your flights, hotels and car rental into an impressive package deal. Save your money for things that really excite you, like discovering every corner of Boulder County.
  • Don't travel during peak seasons if possible. By avoiding summer and school vacations, you can make superb savings on your airfares.

What is the best time to book a flight to Boulder County?
Book your flights to Boulder County in January. This is the perfect time of the year for low prices, followed by February and August. Find cheap flights and make your dream journey a reality with Orbitz.
What day of the week is the cheapest to book a flight to Boulder County?
Get a great flight deal by booking on a Tuesday, Wednesday or Saturday. Typically, these are the best days to pick up cheap fares to Boulder County.
What is the cheapest day of the week to fly to Boulder County?
You can land cheap flights to Boulder County by flying out on a Monday, according to Orbitz data from 2020. Tuesday is also more affordable, while Saturday has the most expensive ticket prices. Whether you prefer to save cash or take off on any day that's convenient, you'll always find a terrific deal with Orbitz.
What is the cheapest month to fly to Boulder County?
To score cheap flights to Boulder County, you should depart in August. If getting a great deal on your ticket is your number one priority, Orbitz data has found that this is generally an excellent month to travel. June is when airfares are the most expensive.
Which airlines allow free cancellation?
Plans change, and your ticket should be able to do the same. That's why Orbitz makes it a cinch to search for flights with no change fees and free cancellation. Just enter your departure and arrival destinations and then select "Filter by flexible change policies." How's that for fuss-free?
What do I need for the flight to Boulder County?
Nothing's more fun than flying somewhere new, but it pays to be prepared. These top tips will help get your trip off to a smooth start:

  • Before you step foot on the plane, you'll need to show some form of government-issued ID, like a passport. You'll also need your boarding pass. If you're traveling with children, check with your airline about which documents they may need.
  • To keep you entertained on the short trip to Boulder County, download some new music or restock the audiobook library on your phone. Food can also be a good distraction while in the air, so maybe even bring some snacks.
  • It can get cool on the plane. If you'd prefer not to shiver your way through the flight, wear an extra layer of clothes.

How do I get cheap first-class/business deals to Boulder County?
There are ways of booking first or business-class fares to Boulder County that won't burn through your wallet. Pick up a seat at the front of the plane for less with these great tips:

  • Be flexible with your travel dates and hold out for huge sales on first or business-class airfares.
  • Many low-cost carriers nowadays have terrific business-class seating for a wallet-friendly price.
  • Bid for an upgrade in online auctions (if available) or upgrade your seat with points earned through loyalty programs.

Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.