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$39+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — DEN
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
1 adult, Economy
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The best prices from Phoenix Sky Harbor Intl to Boulder are usually found in January or August, booked 63 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

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 November 21, 2024.

Popular in

March

Cheapest in

January

Round-trip from

$68
(Frontier)

One-way from

$39
(Frontier)
High demand for flights, 24% potential price rise
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Best time to find cheap flights, 32% potential price drop
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From Phoenix Sky Harbor Intl to Boulder
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One-way flight from Phoenix Sky Harbor Intl to Boulder
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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 November 21, 2024.

This CheapOair deal was found by Cheapflights users on 11/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/106:00 amPHX - DEN
Nonstop1h 51mFrontier
Sat 12/1410:18 pmDEN - PHX
Nonstop2h 02mFrontier
Deal found 11/20$68
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/135:27 pmPHX - DEN
1 stop6h 13mDelta
Sat 12/146:29 pmDEN - PHX
1 stop5h 22mDelta
Deal found 11/20$212
This United Airlines deal was found by Cheapflights users on 11/19. 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 12/128:15 amPHX - DEN
Nonstop1h 55mUnited Airlines
Sat 12/144:15 pmDEN - PHX
Nonstop2h 01mUnited Airlines
Deal found 11/19$219
This eDestinos deal was found by Cheapflights users on 11/20. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/288:43 pmPHX - DEN
1 stop7h 16mMultiple Airlines
Sun 12/110:26 pmDEN - PHX
1 stop25h 15mMultiple Airlines
Deal found 11/20$222
This Mytrip deal was found by Cheapflights users on 11/19. 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.
Thu 12/1212:59 amPHX - DEN
1 stop15h 39mSun Country Air
Mon 12/165:40 pmDEN - PHX
1 stop16h 09mSun Country Air
Deal found 11/19$247
This Southwest deal was found by Cheapflights users on 11/19. 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.
Tue 11/261:45 pmPHX - DEN
Nonstop1h 50mSouthwest
Wed 11/277:45 amDEN - PHX
1 stop4h 00mSouthwest
Deal found 11/19$273

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 2,629,791 searches. Data last updated November 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Sat 1/11

7:28 pm-9:19 pm

Nonstop1h 51m

Denver Intl

Sun 1/12

10:18 pm-12:20 am

Nonstop2h 02m

$68

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Wed 2/26

2:38 pm-7:38 pm

1 stop5h 00m

Denver Intl

Sun 3/2

6:00 am-10:51 am

1 stop4h 51m

$182

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Wed 1/22

11:22 am-3:20 pm

1 stop3h 58m

Denver Intl

Sat 1/25

5:40 am-10:17 am

1 stop4h 37m

$196

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Thu 2/13

6:00 am-10:05 am

1 stop4h 05m

Denver Intl

Mon 2/17

4:15 pm-8:05 pm

1 stop3h 50m

$261

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Thu 12/12

12:59 am-4:38 pm

1 stop15h 39m

Denver Intl

Sun 12/15

7:10 pm-9:22 am

1 stop14h 12m

$264

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Fri 12/6

8:20 am-3:56 pm

1 stop7h 36m

Denver Intl

Sun 12/8

6:46 pm-8:54 pm

Nonstop2h 08m

$267

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Sun 1/12

7:20 pm-9:11 pm

Nonstop1h 51m

$39

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Tue 2/18

2:38 pm-7:38 pm

1 stop5h 00m

$84

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Tue 12/17

2:35 pm-6:50 pm

1 stop4h 15m

$98

PhoenixDenver

PHX - DEN

PHXDEN

Phoenix Sky Harbor Intl

Wed 12/18

12:59 am-4:24 pm

1 stop15h 25m

$112

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 14 results
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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 November 15, 2024.

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 63 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 $270). 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 November 21, 2024.

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 November 18, 2024.

Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to Boulder flight should consider departing on Wednesday at noon 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 November 21, 2024.

The most flights from PHX to BD9 are scheduled on a Wednesday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 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 November 21, 2024.
Read through reviews of airlines operating flights from Phoenix to Boulder, such as Sun Country Air, Frontier 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
5,015 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Comfort

8.1

Entertainment

7.7

Food

7.2

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
5,015 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Comfort

8.1

Entertainment

7.7

Food

7.2

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
9,458 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Comfort

8.1

Entertainment

7.7

Food

7.2

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
8,759 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Comfort

8.1

Entertainment

7.7

Food

7.2

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
9,173 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Comfort

8.1

Entertainment

7.7

Food

7.2

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.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Comfort

8.1

Entertainment

7.7

Food

7.2

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 ($39), United Airlines ($84), and Delta ($98).

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

    Consider SWISS (100%), Envoy Air (96%) or Alaska Airlines (93%) 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 $68 on average our data indicates $778 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 $270). 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.

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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 2,629,791 searches. Data last updated November 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$108FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$121Average$284FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$123Average$281FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$133Average$353FlexibilityNo cancel feeOn-time69%
DeltaCheapest$172Average$270FlexibilityNo cancel feeOn-timeN/A
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