HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Boulder

$38+ 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 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — DEN
janv. 26 — févr. 21
dim. 1/26
dim. 2/2
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.

The best prices from Phoenix Sky Harbor Intl to Boulder are usually found in August or September, booked 30 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Sky Harbor Intl to Boulder

Discover tips and strategies to find the most affordable flight options for your journey from Sky Harbor Intl (PHX) to Boulder (BD9). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated janvier 21, 2025.

Round-trip from

$68
(Frontier)

One-way from

$38
(Cheapflightsfares)

Popular in

November

Cheapest in

August

Average price

$128
From Phoenix Sky Harbor Intl to Boulder
Search Deals
One-way flight from Phoenix Sky Harbor Intl to Boulder
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2025
Search Deals

Find flight deals from Sky Harbor Intl to Boulder

Cheapest flights from Sky Harbor Intl to Boulder
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 janvier 21, 2025.

This Frontier deal was found by Cheapflights users on 1/21. 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.
sam. 2/156:12 pmPHX - DEN
Nonstop1h 54mFrontier
jeu. 2/206:20 amDEN - PHX
Nonstop2h 10mFrontier
Deal found 1/21$68
This Southwest deal was found by Cheapflights users on 1/20. 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.
sam. 2/155:20 amPHX - DEN
Nonstop1h 45mSouthwest
dim. 2/1610:25 pmDEN - PHX
Nonstop2h 00mSouthwest
Deal found 1/20$188
This FlightHub deal was found by Cheapflights users on 1/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/610:10 amPHX - DEN
1 stop3h 55mMultiple Airlines
jeu. 4/1010:49 pmDEN - PHX
1 stop27h 01mMultiple Airlines
Deal found 1/21$190
This Delta deal was found by Cheapflights users on 1/21. 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.
jeu. 2/206:30 amPHX - DEN
1 stop6h 37mDelta
dim. 2/235:40 amDEN - PHX
1 stop4h 37mDelta
Deal found 1/21$197

Find flights from Sky Harbor Intl to Boulder within your budget

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 janvier 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

sam. 2/15

6:12 pm-8:06 pm

Nonstop1h 54m

Denver Intl

jeu. 2/20

6:20 am-8:30 am

Nonstop2h 10m

$68

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

sam. 2/15

5:20 am-7:05 am

Nonstop1h 45m

Denver Intl

dim. 2/16

10:25 pm-12:25 am

Nonstop2h 00m

$188

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

dim. 4/6

10:10 am-3:05 pm

1 stop3h 55m

Denver Intl

jeu. 4/10

10:49 pm-12:50 am

1 stop27h 01m

$190

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

jeu. 2/20

6:30 am-1:07 pm

1 stop6h 37m

Denver Intl

dim. 2/23

5:40 am-10:17 am

1 stop4h 37m

$197

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

dim. 3/23

5:15 am-8:06 am

Nonstop1h 51m

Denver Intl

lun. 3/31

3:55 pm-9:02 pm

1 stop6h 07m

$232

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

jeu. 2/20

12:05 pm-1:57 pm

Nonstop1h 52m

$38

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

mar. 2/18

9:10 pm-10:55 pm

Nonstop1h 45m

$80

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

mer. 2/19

5:39 pm-7:30 pm

Nonstop1h 51m

$94

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

mer. 2/19

6:31 pm-10:47 pm

1 stop4h 16m

$99

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

mar. 3/25

5:15 am-1:40 pm

2 stops7h 25m

$117

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 13 results
1
2

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.

Travel insights for flights from Sky Harbor Intl to Boulder

Get recent, data-driven insights about flights from Sky Harbor Intl to Boulder including ideal travel times, pricing trends, and more.

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 17, 2025.

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 30 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, October is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Boulder (average of $197). Flying from Phoenix Sky Harbor Intl Airport 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 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 janvier 21, 2025.

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

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 December 16, 2024.

Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to Boulder flight should consider departing on Wednesday 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.

Weekly flight availability from Phoenix Sky Harbor Intl Airport to Boulder

Explore weekly flight availability from Sky Harbor Intl 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 janvier 21, 2025.

The most flights from PHX to BD9 are scheduled on a Monday (54 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 janvier 21, 2025.
Read through reviews of airlines operating flights from Phoenix to Boulder, such as Frontier, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,662 reviews

Entertainment

7.7

Overall

8.1

Food

7.2

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Southwest
8.1
Very good
4,662 reviews
Southwest
8.1
Very good
4,662 reviews

Entertainment

7.7

Overall

8.1

Food

7.2

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Alaska Airlines
8.0
Very good
9,706 reviews
Southwest
8.1
Very good
4,662 reviews

Entertainment

7.7

Overall

8.1

Food

7.2

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,662 reviews

Entertainment

7.7

Overall

8.1

Food

7.2

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

United Airlines
7.4
Good
8,984 reviews
Southwest
8.1
Very good
4,662 reviews

Entertainment

7.7

Overall

8.1

Food

7.2

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

Sun Country Air
7.0
Good
386 reviews
Southwest
8.1
Very good
4,662 reviews

Entertainment

7.7

Overall

8.1

Food

7.2

Crew

8.7

Boarding

8.2

Comfort

8.1

Reviews

1 / 10

The seats are too narrow and uncomfortable. I do appreciate that there was room for my knees. I hate the boarding circus.

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.

  • What are the cheapest airlines to fly from Phoenix Sky Harbor Intl Airport to Boulder one-way?

    The cheapest airlines for a one-way flight from Phoenix Sky Harbor Intl Airport to Boulder are Frontier ($38), Southwest ($80), and United Airlines ($94).

  • What are the most reliable airlines from Phoenix Sky Harbor Intl Airport to Boulder?

    Consider SkyWest Airlines (100%), Frontier (91%) or Air Canada (89%) when booking your flight. These represent the most reliable airlines when flying from Phoenix Sky Harbor Intl Airport to Boulder.

  • What are the cheapest flights from Phoenix Sky Harbor Intl Airport to Boulder?

    Looking at all options, your cheapest flight can be booked for $50. While the most popular route (Phoenix Sky Harbor Intl - Denver Intl) can be booked for $88 on average our data indicates $1,142 when flying from Phoenix Sky Harbor Intl Airport to Boulder.

  • Can I find deals for flights from Sky Harbor Intl to Boulder that include hotel bookings?

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

  • How can I find direct flights from Sky Harbor Intl to Boulder?

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

  • Can I find deals for business class flights from Sky Harbor Intl to Boulder?

    Yes. Cheapflights offers flight deals from Sky Harbor Intl 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 Phoenix Sky Harbor Intl Airport to Boulder?

    Currently, October is the cheapest month in which you can book a flight from Phoenix Sky Harbor Intl Airport to Boulder (average of $197). Flying from Phoenix Sky Harbor Intl Airport 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

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.

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 janvier 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$110FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$124Average$292FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$124Average$286FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$135Average$355FlexibilityNo cancel feeOn-time69%
DeltaCheapest$172Average$258FlexibilityNo cancel feeOn-timeN/A
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.