$33+ Cheap flights from Sky Harbor Intl (PHX) 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — DEN
feb. 5 — feb. 121
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Sky Harbor Intl to Boulder with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Phoenix Sky Harbor Intl to Boulder are usually found in February or January, booked 78 days in advance, depart on a Thursday or Friday and return on a Wednesday
Cheap flight deals from Sky Harbor Intl to Boulder
Keep the following information in mind while searching for Sky Harbor Intl to Boulder flight deals. Data was last updated enero 6, 2026.
Round-trip from | $63 (Super.com) |
|---|---|
One-way from | $33 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $122 |
Find flight deals from Sky Harbor Intl to Boulder
Cheapest flights from Sky Harbor Intl to BoulderExplore the most affordable flight options available from Sky Harbor Intl to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 6, 2026.
Explore the most affordable flight options available from Sky Harbor Intl to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 6, 2026.
This Super.com deal was found by Cheapflights users on 1/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 1/175:10 pmPHX - DEN
Nonstop1h 53mFrontier
mar. 1/205:11 pmDEN - PHX
Nonstop2h 08mFrontier
Deal found 1/5![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 1/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 3/186:55 pmPHX - DEN
Nonstop1h 55mFrontier
mar. 3/244:36 pmDEN - PHX
Nonstop2h 10mFrontier
Deal found 1/4![Frontier logo]()
$65
This Cheapflightsfares deal was found by Cheapflights users on 1/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/207:36 pmPHX - DEN
Nonstop1h 54mFrontier
dom. 2/226:00 amDEN - PHX
Nonstop2h 12mFrontier
Deal found 1/6![Frontier logo]()
$66
This Cheapflightsfares deal was found by Cheapflights users on 1/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/137:36 pmPHX - DEN
Nonstop1h 54mFrontier
lun. 2/166:00 amDEN - PHX
Nonstop2h 12mFrontier
Deal found 1/6![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 1/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 1/213:55 pmPHX - DEN
Nonstop1h 54mFrontier
lun. 1/264:14 pmDEN - PHX
Nonstop2h 10mFrontier
Deal found 1/5![Frontier logo]()
$68
This Frontier deal was found by Cheapflights users on 1/4. 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.
mié. 1/213:55 pmPHX - DEN
Nonstop1h 54mFrontier
sáb. 1/2411:27 amDEN - PHX
Nonstop2h 13mFrontier
Deal found 1/4![Frontier logo]()
$69
This Priceline deal was found by Cheapflights users on 1/5. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/510:51 pmPHX - DEN
Nonstop1h 51mFrontier
lun. 3/910:40 pmDEN - PHX
Nonstop2h 11mFrontier
Deal found 1/5![Frontier logo]()
$71
This Cheapflightsfares deal was found by Cheapflights users on 1/6. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 1/299:22 amPHX - DEN
Nonstop1h 58mFrontier
dom. 2/16:40 pmDEN - PHX
Nonstop2h 08mFrontier
Deal found 1/6![Frontier logo]()
$72
This Cheapflightsfares deal was found by Cheapflights users on 1/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 2/17:00 amPHX - DEN
Nonstop1h 54mFrontier
vie. 2/610:29 pmDEN - PHX
Nonstop2h 11mFrontier
Deal found 1/5![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 1/4. 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.
sáb. 1/175:10 pmPHX - DEN
Nonstop1h 53mFrontier
mié. 1/2111:27 amDEN - PHX
Nonstop2h 13mFrontier
Deal found 1/4![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 1/5. 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.
mié. 1/211:00 pmPHX - DEN
Nonstop1h 54mFrontier
mié. 1/215:11 pmDEN - PHX
Nonstop2h 08mFrontier
Deal found 1/5![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 1/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 1/257:00 amPHX - DEN
Nonstop1h 54mFrontier
lun. 1/264:14 pmDEN - PHX
Nonstop2h 10mFrontier
Deal found 1/4![Frontier logo]()
$76
Cheapflights Fare Finder
Customize your flight search to find flights from Sky Harbor Intl 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 enero 6, 2026.
Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to Boulder that are best for you.
Fly from
Sky Harbor Intl
Fly to
Boulder
Route
Depart
Return
Price
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
mar. 2/3
8:30 am-10:27 am
Nonstop1h 57m
Denver Intl
mié. 2/4
7:00 am-1:39 pm
1 stop6h 39m
$93
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
jue. 1/22
9:22 am-11:20 am
Nonstop1h 58m
Denver Intl
dom. 1/25
9:54 am-12:10 pm
Nonstop2h 16m
$107
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
jue. 1/29
12:56 pm-2:52 pm
Nonstop1h 56m
Denver Intl
lun. 2/2
7:45 am-9:54 am
Nonstop2h 09m
$127
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
mié. 2/18
12:28 pm-5:48 pm
1 stop5h 20m
Denver Intl
mié. 2/25
6:45 pm-11:42 pm
1 stop4h 57m
$137
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
jue. 3/5
12:28 pm-5:48 pm
1 stop5h 20m
Denver Intl
lun. 3/9
6:45 pm-2:45 pm
1 stop21h 00m
$145
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
lun. 2/2
8:07 pm-11:38 am
1 stop15h 31m
Denver Intl
lun. 2/9
7:39 pm-2:00 pm
1 stop18h 21m
$145
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
sáb. 1/17
3:45 pm-11:58 pm
1 stop8h 13m
Denver Intl
mar. 1/20
12:34 pm-7:25 pm
1 stop6h 51m
$151
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
sáb. 1/17
3:45 pm-11:58 pm
1 stop8h 13m
Denver Intl
dom. 1/18
12:34 pm-7:25 pm
1 stop6h 51m
$151
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
vie. 2/6
11:41 am-6:41 pm
1 stop7h 00m
Denver Intl
mar. 2/10
8:04 am-2:00 pm
1 stop5h 56m
$157
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
mar. 3/17
3:11 pm-6:05 pm
Nonstop1h 54m
$33
Showing 1-10 of 19 results
Best time to book a flight from Sky Harbor Intl to Boulder
Have a flexible travel schedule? Discover the best time to fly to Boulder from Sky Harbor Intl 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 Phoenix Sky Harbor Intl Airport to Boulder
How far ahead should I book a flight from Phoenix Sky Harbor Intl Airport to Boulder?
Use this chart to determine the optimal time to book a round-trip flight from Sky Harbor Intl to Boulder. Price data was last updated on January 2, 2026.
To ensure you get the cheapest price possible for a flight from Phoenix Sky Harbor Intl Airport to Boulder, you should look to book at least 73 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 Phoenix Sky Harbor Intl Airport to Boulder?
Currently, February is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Boulder (average of $53). Flying from Phoenix Sky Harbor Intl Airport to Boulder in July is currently the most expensive (average of $102). 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 PHX to BD9?
Find hourly flight availability from Sky Harbor Intl 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 enero 6, 2026.
A simple way to save on the total cost of your ticket is to fly from Phoenix Sky Harbor Intl Airport to Boulder in the evening. If you’re flexible enough to do this you can expect to save up to 48% on your trip compared to booking a flight at noon.
What is the cheapest day to fly from Phoenix Sky Harbor Intl Airport to Boulder?
Use this chart to determine the cheapest time to fly round-trip from Sky Harbor Intl to Boulder. Price data was last updated on January 3, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to Boulder flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 enero 6, 2026.
Read through reviews of airlines operating flights from Phoenix Sky Harbor Intl Airport to Boulder, such as Southwest, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Sky Harbor Intl to Boulder. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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.
Alternative routes for Sky Harbor Intl to Boulder
See prices for flight routes from nearby airports that may be better suited for you.
Top 5 airlines flying from Sky Harbor Intl to Boulder
Discover the top 5 airlines that operate flights from Sky Harbor Intl 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 enero 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$64 | Average$145 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$137 | Average$220 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$138 | Average$297 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$152 | Average$272 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$206 | Average$278 | FlexibilityNo cancel fee | On-timeN/A |