$49+ Cheap flights from Sky Harbor Intl (PHX) to Boulder, CO
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — DEN
Oct 19 — Oct 261
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 Saturday or Thursday 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 September 19, 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 September 19, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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.
Tue 10/138:51 pm -
Nonstop1h 52m
Tue 10/207:12 am -
Nonstop1h 58m
Deal found 9/15![Frontier logo]()
$94
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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.
Tue 10/139:15 am -
Nonstop2h 00m
Tue 10/1310:44 pm -
Nonstop2h 04m
Deal found 9/16![Frontier logo]()
$95
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/79:15 am -
Nonstop1h 56m
Tue 10/137:12 am -
Nonstop1h 58m
Deal found 9/15![Frontier logo]()
$96
This CheapOair deal was found by Cheapflights users on 9/16. 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 10/136:15 am -
Nonstop1h 55m
Sat 10/176:44 pm -
Nonstop2h 02m
Deal found 9/16![Frontier logo]()
$97
This Trip.com deal was found by Cheapflights users on 9/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:51 pm -
Nonstop1h 52m
Wed 10/216:44 pm -
Nonstop2h 02m
Deal found 9/17![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/276:15 am -
Nonstop1h 54m
Thu 10/2910:37 pm -
Nonstop2h 05m
Deal found 9/15![Frontier logo]()
$100
This Trip.com deal was found by Cheapflights users on 9/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/29:59 pm -
Nonstop1h 54m
Mon 11/910:37 pm -
Nonstop2h 05m
Deal found 9/18![Frontier logo]()
$101
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/278:59 pm -
Nonstop1h 50m
Sat 10/317:00 am -
Nonstop2h 04m
Deal found 9/16![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/287:15 am -
Nonstop1h 52m
Fri 10/306:46 pm -
Nonstop2h 08m
Deal found 9/15![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/66:25 am -
Nonstop2h 18m
Wed 10/710:47 pm -
Nonstop1h 56m
Deal found 9/16![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 9/15. 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.
Tue 10/63:21 pm -
Nonstop1h 54m
Sat 10/1010:44 pm -
Nonstop2h 04m
Deal found 9/15![Frontier logo]()
$106
This Cheapflightsfares deal was found by Cheapflights users on 9/17. 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 10/86:15 am -
Nonstop1h 55m
Tue 10/137:12 am -
Nonstop1h 58m
Deal found 9/17![Frontier logo]()
$107
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 September 19, 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 September 19, 2026.
This Southwest deal was found by Cheapflights users on 9/17. 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.
Sat 10/106:45 pm -
Nonstop1h 50m
Sat 10/176:00 am -
Nonstop1h 55m
Deal found 9/17![Southwest logo]()
$185
This Delta deal was found by Cheapflights users on 9/18. 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.
Tue 10/205:45 am -
1 stop5h 11m
Wed 10/288:20 am -
1 stop4h 57m
Deal found 9/18![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 9/18. 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 12/182:48 pm -
Nonstop1h 55m
Mon 12/217:40 am -
Nonstop2h 09m
Deal found 9/18![United Airlines logo]()
$259
This Alaska Airlines deal was found by Cheapflights users on 9/18. 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.
Tue 10/277:38 am -
2 stops9h 47m
Wed 11/118:20 am -
1 stop7h 50m
Deal found 9/18![Alaska Airlines logo]()
$295
This Delta deal was found by Cheapflights users on 9/18. 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 10/225:45 am -
1 stop5h 11m
Wed 10/285:25 am -
1 stop4h 21m
Deal found 9/18![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 9/19. 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.
Fri 10/165:25 pm -
Nonstop1h 55m
Sat 10/177:35 pm -
Nonstop1h 55m
Deal found 9/19![Southwest logo]()
$204
This Delta deal was found by Cheapflights users on 9/18. 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 10/225:27 pm -
1 stop4h 13m
Mon 10/2610:45 am -
1 stop6h 29m
Deal found 9/18![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 9/15. 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.
Tue 10/135:29 pm -
1 stop4h 11m
Mon 10/195:25 am -
1 stop4h 21m
Deal found 9/15![Delta logo]()
$219
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 10/271:50 pm -
Nonstop1h 50m
Wed 11/117:45 am -
Nonstop2h 04m
Deal found 9/16![United Airlines logo]()
$265
This United Airlines deal was found by Cheapflights users on 9/19. 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 11/51:00 pm -
Nonstop1h 50m
Mon 11/94:20 pm -
Nonstop2h 02m
Deal found 9/19![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 9/15. 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 11/610:55 am -
1 stop6h 01m
Tue 11/105:35 am -
1 stop4h 00m
Deal found 9/15![Delta logo]()
$232
This Southwest deal was found by Cheapflights users on 9/14. 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.
Mon 10/265:20 am -
Nonstop1h 45m
Wed 11/48:20 am -
Nonstop2h 10m
Deal found 9/14![Southwest logo]()
$301
Last-minute flights from Sky Harbor Intl to BoulderDiscover last-minute flight deals from Sky Harbor Intl to Boulder. Data last updated September 19, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to Boulder. Data last updated September 19, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/66:25 am -
Nonstop2h 18m
Wed 10/710:47 pm -
Nonstop1h 56m
Deal found 9/16![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 9/15. 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.
Tue 10/63:21 pm -
Nonstop1h 54m
Sat 10/1010:44 pm -
Nonstop2h 04m
Deal found 9/15![Frontier logo]()
$106
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/79:15 am -
Nonstop1h 56m
Tue 10/137:12 am -
Nonstop1h 58m
Deal found 9/15![Frontier logo]()
$96
This Cheapflightsfares deal was found by Cheapflights users on 9/17. 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 10/86:15 am -
Nonstop1h 55m
Tue 10/137:12 am -
Nonstop1h 58m
Deal found 9/17![Frontier logo]()
$107
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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.
Tue 10/138:51 pm -
Nonstop1h 52m
Tue 10/207:12 am -
Nonstop1h 58m
Deal found 9/15![Frontier logo]()
$94
This Super.com deal was found by Cheapflights users on 9/17. 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.
Tue 10/139:15 am -
Nonstop2h 00m
Sat 10/1710:44 pm -
Nonstop2h 04m
Deal found 9/17![Frontier logo]()
$95
This Trip.com deal was found by Cheapflights users on 9/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:51 pm -
Nonstop1h 52m
Wed 10/216:44 pm -
Nonstop2h 02m
Deal found 9/17![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 9/18. 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.
Mon 10/198:51 pm -
Nonstop1h 52m
Tue 10/2710:37 pm -
Nonstop2h 05m
Deal found 9/18![Frontier logo]()
$108
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/276:15 am -
Nonstop1h 54m
Thu 10/2910:37 pm -
Nonstop2h 05m
Deal found 9/15![Frontier logo]()
$100
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/278:59 pm -
Nonstop1h 50m
Sat 10/317:00 am -
Nonstop2h 04m
Deal found 9/16![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/287:15 am -
Nonstop1h 52m
Fri 10/306:46 pm -
Nonstop2h 08m
Deal found 9/15![Frontier logo]()
$104
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 September 19, 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 September 19, 2026.
This Super.com deal was found by Cheapflights users on 9/14. 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 10/148:51 pm -
Nonstop1h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$49
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 11/189:59 pm -
Nonstop1h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$56
This Frontier deal was found by Cheapflights users on 9/17. 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 11/1410:09 am -
Nonstop1h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$58
This Frontier deal was found by Cheapflights users on 9/14. 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 12/129:00 pm -
Nonstop1h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$59
This Super.com deal was found by Cheapflights users on 9/16. 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.
Thu 10/158:51 pm -
Nonstop1h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 9/17. 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.
Thu 11/57:15 am -
Nonstop1h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$62
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Mon 11/237:25 am -
Nonstop1h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$63
This Trip.com deal was found by Cheapflights users on 9/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/29:59 pm -
Nonstop1h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$64
This Super.com deal was found by Cheapflights users on 9/18. 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.
Mon 10/128:51 pm -
Nonstop1h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$66
This Mytrip deal was found by Cheapflights users on 9/18. 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.
Tue 11/37:21 pm -
1 stop4h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$67
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 September 19, 2026.
Round-trip from | $94 (Cheapflightsfares) |
|---|---|
One-way from | $49 (Super.com) |
Popular in | July |
Cheapest in | February |
Average price | $229 |
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 7,457,451 searches. Data last updated September 19, 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 Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Tue 10/27
9:55 am-4:56 pm
1 stop6h 01m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$99
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Thu 10/8
5:27 pm-10:40 pm
1 stop4h 13m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$117
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Mon 11/23
10:45 am-5:10 pm
1 stop6h 25m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$117
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Thu 10/29
10:00 pm-12:50 am
Nonstop1h 50m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$124
Quickest round-trip
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Thu 10/15
6:15 pm-9:00 pm
Nonstop1h 45m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$124
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Fri 11/27
10:40 pm-12:30 am
Nonstop1h 50m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$140
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Sat 10/3
10:12 am-6:01 pm
1 stop6h 49m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$149
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Sun 11/15
8:00 am-12:57 pm
1 stop4h 57m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$151
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Wed 3/10
7:00 am-11:55 am
1 stop4h 55m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$156
PhoenixDenver
PHX Phoenix Sky Harbor Intl - DEN Denver Intl
PHXDEN
Phoenix Sky Harbor Intl
Wed 3/17
7:10 am-3:10 pm
2 stops7h 00m
Denver Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$156
Showing 1-10 of 22 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 September 19, 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 25% 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 September 19, 2026.
The most flights from PHX to BD9 are scheduled on a Friday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 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 $134 and $280 in October.The cheapest round-trip price found within the last 5 days was $94 on Frontier (Oct 13-Oct 20).
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 September 19, 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 September 19, 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.
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
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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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 7,457,451 searches. Data last updated September 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$62 | Average$160 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$149 | Average$325 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$149 | Average$273 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$176 | Average$337 | FlexibilityNo cancel fee | On-time63% |