$53+ 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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — DEN
Sep 3 — Sep 101
Round-trip
1 adult, Economy
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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 October, booked 69 days in advance, depart on a Thursday or Saturday and return on a Saturday
Cheap flight deals from Sky Harbor Intl to Boulder
Cheapest
Best
Last-minute
One-way
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 August 4, 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 August 4, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 8/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:35 am -
Nonstop1h 59m
Mon 9/76:45 am -
Nonstop1h 55m
Deal found 8/4![Frontier logo]()
$105
This deal was found by Cheapflights users on 8/3. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:35 am -
Nonstop1h 58m
Sat 9/56:45 am -
Nonstop1h 55m
Deal found 8/3![Frontier logo]()
$107
This Cheapflightsfares deal was found by Cheapflights users on 8/1. 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.
Wed 9/28:35 am -
Nonstop1h 58m
Mon 9/76:45 am -
Nonstop1h 55m
Deal found 8/1![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Fri 9/116:25 am -
1 stop7h 40m
Sun 9/137:00 am -
Nonstop2h 00m
Deal found 8/1![Frontier logo]()
$110
This Cheapflightsfares deal was found by Cheapflights users on 8/1. 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.
Thu 8/204:48 pm -
Nonstop1h 58m
Mon 8/2410:48 pm -
Nonstop1h 51m
Deal found 8/1![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 8/2. 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.
Wed 11/111:42 pm -
Nonstop1h 51m
Sat 11/141:34 pm -
Nonstop2h 01m
Deal found 8/2![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Thu 10/85:00 pm -
1 stop6h 06m
Sun 10/1110:00 am -
Nonstop2h 07m
Deal found 8/1![Frontier logo]()
$113
This Cheapflightsfares deal was found by Cheapflights users on 7/31. 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.
Thu 9/39:03 am -
1 stop11h 38m
Tue 9/810:48 pm -
Nonstop1h 51m
Deal found 7/31![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Mon 8/246:57 pm -
Nonstop1h 56m
Fri 8/2810:29 pm -
1 stop10h 29m
Deal found 7/30![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 7/31. 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.
Wed 8/2611:21 am -
Nonstop1h 56m
Mon 8/315:05 am -
1 stop8h 07m
Deal found 7/31![Frontier logo]()
$116
This Frontier deal was found by Cheapflights users on 7/31. 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.
Wed 8/268:35 am -
Nonstop1h 58m
Fri 8/2810:48 pm -
Nonstop1h 51m
Deal found 7/31![Frontier logo]()
$117
Best flights from Sky Harbor Intl to BoulderDiscover carefully curated flight deals from Sky Harbor Intl to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 4, 2026.
Discover carefully curated flight deals from Sky Harbor Intl to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 4, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:13 pm -
1 stop6h 13m
Wed 9/96:17 am -
1 stop9h 16m
Deal found 8/2![Alaska Airlines logo]()
$203
This Delta deal was found by Cheapflights users on 8/3. 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.
Thu 9/35:10 pm -
1 stop4h 45m
Sat 9/53:56 pm -
1 stop7h 15m
Deal found 8/3![Delta logo]()
$246
This Southwest deal was found by Cheapflights users on 8/2. 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.
Thu 8/278:00 am -
1 stop3h 15m
Mon 8/3110:15 am -
1 stop3h 30m
Deal found 8/2![Southwest logo]()
$246
This United Airlines deal was found by Cheapflights users on 8/1. 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.
Fri 10/911:54 am -
Nonstop1h 55m
Mon 10/126:30 pm -
Nonstop2h 02m
Deal found 8/1![United Airlines logo]()
$336
This Delta deal was found by Cheapflights users on 8/2. 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 9/45:10 pm -
1 stop4h 45m
Thu 9/107:05 am -
1 stop6h 10m
Deal found 8/2![Delta logo]()
$276
This Southwest deal was found by Cheapflights users on 8/3. 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.
Fri 8/289:15 am -
Nonstop1h 55m
Sat 8/296:20 pm -
Nonstop2h 05m
Deal found 8/3![Southwest logo]()
$286
This Alaska Airlines deal was found by Cheapflights users on 8/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:02 am -
2 stops11h 30m
Sat 8/296:17 am -
1 stop9h 16m
Deal found 8/1![Alaska Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 8/2. 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.
Thu 8/2712:35 pm -
1 stop3h 20m
Sun 8/308:30 am -
2 stops6h 50m
Deal found 8/2![Southwest logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 8/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/293:42 pm -
1 stop7h 17m
Mon 11/22:55 pm -
2 stops8h 31m
Deal found 8/3![Alaska Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 8/1. 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.
Fri 8/288:00 am -
1 stop3h 15m
Sun 8/308:30 am -
2 stops6h 50m
Deal found 8/1![Southwest logo]()
$323
This Alaska Airlines deal was found by Cheapflights users on 7/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:13 pm -
1 stop6h 13m
Mon 9/148:08 am -
2 stops15h 19m
Deal found 7/31![Alaska Airlines logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 8/4. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/237:08 am -
2 stops10h 02m
Thu 9/248:06 pm -
1 stop16h 25m
Deal found 8/4![Alaska Airlines logo]()
$361
Last-minute flights from Sky Harbor Intl to BoulderDiscover last-minute flight deals from Sky Harbor Intl to Boulder. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to Boulder. Data last updated August 4, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 8/1. 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.
Thu 8/204:48 pm -
Nonstop1h 58m
Mon 8/2410:48 pm -
Nonstop1h 51m
Deal found 8/1![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Mon 8/246:57 pm -
Nonstop1h 56m
Fri 8/2810:29 pm -
1 stop10h 29m
Deal found 8/1![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 7/30. 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.
Wed 8/268:35 am -
Nonstop1h 58m
Wed 8/266:55 pm -
1 stop5h 29m
Deal found 7/30![Frontier logo]()
$116
This Frontier deal was found by Cheapflights users on 7/31. 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.
Wed 8/268:35 am -
Nonstop1h 58m
Fri 8/2810:48 pm -
Nonstop1h 51m
Deal found 7/31![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Tue 9/16:57 pm -
Nonstop1h 56m
Mon 9/77:40 am -
1 stop25h 18m
Deal found 8/1![Frontier logo]()
$112
This deal was found by Cheapflights users on 8/3. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:35 am -
Nonstop1h 58m
Sat 9/56:45 am -
Nonstop1h 55m
Deal found 8/3![Frontier logo]()
$107
This Cheapflightsfares deal was found by Cheapflights users on 8/1. 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.
Wed 9/28:35 am -
Nonstop1h 58m
Mon 9/76:45 am -
Nonstop1h 55m
Deal found 8/1![Frontier logo]()
$109
This Cheapflightsfares deal was found by Cheapflights users on 7/31. 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.
Thu 9/39:03 am -
1 stop11h 38m
Tue 9/810:48 pm -
Nonstop1h 51m
Deal found 7/31![Frontier logo]()
$114
This Cheapflightsfares deal was found by Cheapflights users on 8/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:35 am -
Nonstop1h 59m
Mon 9/76:45 am -
Nonstop1h 55m
Deal found 8/4![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Fri 9/116:25 am -
1 stop7h 40m
Sun 9/137:00 am -
Nonstop2h 00m
Deal found 8/1![Frontier logo]()
$110
One-way flights from Sky Harbor Intl to BoulderSearch for one-way flight options from Sky Harbor Intl to Boulder. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
Search for one-way flight options from Sky Harbor Intl to Boulder. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This Frontier deal was found by Cheapflights users on 8/2. 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.
Sat 10/33:21 pm -
Nonstop1h 54m
Deal found 8/2![Frontier logo]()
$53
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Tue 10/277:05 am -
1 stop5h 44m
Deal found 7/30![Frontier logo]()
$56
This Super.com deal was found by Cheapflights users on 8/1. 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.
Wed 8/264:48 pm -
Nonstop1h 58m
Deal found 8/1![Frontier logo]()
$57
This Cheapflightsfares deal was found by Cheapflights users on 7/31. 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.
Thu 9/36:35 am -
Nonstop1h 59m
Deal found 7/31![Frontier logo]()
$58
This Frontier deal was found by Cheapflights users on 8/2. 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.
Thu 10/299:06 am -
Nonstop2h 00m
Deal found 8/2![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Tue 9/17:00 pm -
1 stop14h 03m
Deal found 7/30![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sun 9/64:48 pm -
Nonstop1h 58m
Deal found 7/31![Frontier logo]()
$61
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Mon 8/3110:33 pm -
1 stop10h 30m
Deal found 7/30![Frontier logo]()
$62
This Kiwi.com deal was found by Cheapflights users on 8/2. 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.
Mon 11/96:55 pm -
1 stop8h 57m
Deal found 8/2![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Thu 10/155:55 pm -
1 stop5h 20m
Deal found 7/31![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 8/2. 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.
Sat 9/51:53 pm -
1 stop19h 10m
Deal found 8/2![Frontier logo]()
$66
Find 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 August 4, 2026.
Round-trip from | $105 (Cheapflightsfares) |
|---|---|
One-way from | $53 (Frontier) |
Popular in | July |
Cheapest in | February |
Average price | $203 |
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 August 4, 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
Fly to
Route
Depart
Return
Cheapest round-trip
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Sat 9/5
12:13 pm-7:26 pm
1 stop6h 13m
Denver Intl
Wed 9/9
6:17 am-2:33 pm
1 stop9h 16m
$203
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Thu 9/3
5:10 pm-10:55 pm
1 stop4h 45m
Denver Intl
Sat 9/5
3:56 pm-10:11 pm
1 stop7h 15m
$246
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Thu 8/27
8:00 am-12:15 pm
1 stop3h 15m
Denver Intl
Mon 8/31
10:15 am-12:45 pm
1 stop3h 30m
$246
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Fri 9/4
5:10 pm-10:55 pm
1 stop4h 45m
Denver Intl
Thu 9/10
7:05 am-12:15 pm
1 stop6h 10m
$276
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Fri 8/28
9:15 am-12:10 pm
Nonstop1h 55m
Denver Intl
Sat 8/29
6:20 pm-7:25 pm
Nonstop2h 05m
$286
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Thu 8/27
12:35 pm-4:55 pm
1 stop3h 20m
Denver Intl
Sun 8/30
8:30 am-2:20 pm
2 stops6h 50m
$302
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Fri 8/28
8:00 am-12:15 pm
1 stop3h 15m
Denver Intl
Sun 8/30
8:30 am-2:20 pm
2 stops6h 50m
$323
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Sat 8/22
6:02 am-6:32 pm
2 stops11h 30m
Denver Intl
Sat 8/29
6:17 am-2:33 pm
1 stop9h 16m
$328
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Thu 10/29
3:42 pm-11:59 pm
1 stop7h 17m
Denver Intl
Mon 11/2
2:55 pm-11:26 pm
2 stops8h 31m
$332
Quickest round-trip
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Fri 10/9
11:54 am-2:49 pm
Nonstop1h 55m
Denver Intl
Mon 10/12
6:30 pm-7:32 pm
Nonstop2h 02m
$336
Showing 1-10 of 23 resultsSorted by cheapest first
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.
PHX-DEN
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
PHX-BD9
PHX-DEN
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 August 4, 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 19% on your trip compared to booking a flight at noon.
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 August 4, 2026.
The most flights from PHX to BD9 are scheduled on a Monday (42 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).
How much does it cost to fly round-trip from Phoenix Sky Harbor Intl Airport to Boulder?
Airfare is below average for this route at the moment.
Phoenix Sky Harbor Intl Airport to Boulder flights typically cost between $133 and $266 in September.The cheapest round-trip price found within the last 5 days was $105 on Frontier (Sep 1-Sep 5).
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 August 1, 2026.
Travelers seeking maximum savings on their Phoenix Sky Harbor Intl Airport to Boulder flight should consider departing on Thursday 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 August 4, 2026.
Read through reviews of airlines operating flights from Phoenix Sky Harbor Intl Airport to Boulder, such as Southwest,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Boarding
8.1
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.
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Sky Harbor Intl and Boulder flights
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Top 4 airlines flying from Sky Harbor Intl to Boulder
Discover the top 4 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 August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$62 | Average$157 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$137 | Average$262 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$141 | Average$361 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$158 | Average$331 | FlexibilityNo cancel fee | On-time63% |