$57+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — DEN
Jul 5 — Jul 121
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 Friday and return on a Saturday
Cheap flight deals from Sky Harbor Intl to Boulder
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Best
Last-minute
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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 June 5, 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 June 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/294:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Wed 8/55:23 pm
DEN
- PHX
1 stop6h 57m
Frontier
Deal found 6/3![Frontier logo]()
$112
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Wed 7/222:45 pm
DEN
- PHX
Nonstop1h 58m
Frontier
Deal found 6/3![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 6/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/68:40 am
PHX
- DEN
Nonstop1h 57m
Frontier
Tue 6/3012:22 pm
DEN
- PHX
Nonstop1h 58m
Frontier
Deal found 6/2![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 6/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/306:53 pm
PHX
- DEN
Nonstop1h 56m
Frontier
Tue 8/412:22 pm
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/3![Frontier logo]()
$117
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:53 pm
PHX
- DEN
Nonstop1h 56m
Frontier
Thu 8/66:45 am
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/4![Frontier logo]()
$119
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/302:15 pm
PHX
- DEN
Nonstop1h 55m
Frontier
Sat 7/42:47 pm
DEN
- PHX
Nonstop2h 01m
Frontier
Deal found 6/3![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 6/2. 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.
Tue 7/74:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Sat 7/1110:36 pm
DEN
- PHX
Nonstop1h 56m
Frontier
Deal found 6/2![Frontier logo]()
$122
This Frontier deal was found by Cheapflights users on 6/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/274:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Sat 6/2710:36 pm
DEN
- PHX
Nonstop1h 53m
Frontier
Deal found 6/3![Frontier logo]()
$123
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/136:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Wed 6/249:15 am
DEN
- PHX
Nonstop2h 01m
Frontier
Deal found 6/3![Frontier logo]()
$124
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/144:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Mon 7/206:45 am
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/3![Frontier logo]()
$125
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Sat 6/2710:36 pm
DEN
- PHX
Nonstop1h 53m
Frontier
Deal found 6/5![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 6/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/266:40 am
PHX
- DEN
Nonstop1h 59m
Frontier
Tue 8/412:22 pm
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/3![Frontier logo]()
$127
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 June 5, 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 June 5, 2026.
This Alaska Airlines deal was found by Cheapflights users on 6/3. 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.
Wed 7/223:13 pm
PHX
- DEN
1 stop7h 17m
Alaska Airlines
Wed 7/296:00 am
DEN
- PHX
1 stop7h 23m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:35 am
PHX
- DEN
2 stops6h 55m
Southwest
Tue 10/208:50 am
DEN
- PHX
1 stop3h 15m
Southwest
Deal found 6/5![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 6/2. 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.
Tue 6/305:18 pm
PHX
- DEN
1 stop3h 42m
Delta
Sun 7/127:57 pm
DEN
- PHX
1 stop5h 09m
Delta
Deal found 6/2![Delta logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 6/4. 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 6/243:13 pm
PHX
- DEN
1 stop7h 17m
Alaska Airlines
Tue 6/306:00 am
DEN
- PHX
1 stop7h 23m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$233
This Alaska Airlines deal was found by Cheapflights users on 6/3. 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.
Wed 7/226:53 pm
PHX
- DEN
1 stop14h 40m
Alaska Airlines
Fri 7/247:59 pm
DEN
- PHX
1 stop17h 24m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$234
This Southwest deal was found by Cheapflights users on 6/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/308:10 am
PHX
- DEN
1 stop4h 25m
Southwest
Tue 7/79:35 am
DEN
- PHX
2 stops6h 15m
Southwest
Deal found 6/4![Southwest logo]()
$270
This Alaska Airlines deal was found by Cheapflights users on 6/4. 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.
Thu 9/173:15 pm
PHX
- DEN
1 stop7h 29m
Alaska Airlines
Sun 9/206:17 am
DEN
- PHX
1 stop6h 14m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 6/2. 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.
Wed 7/11:25 pm
PHX
- DEN
1 stop3h 20m
Southwest
Sat 7/117:45 am
DEN
- PHX
2 stops6h 15m
Southwest
Deal found 6/2![Southwest logo]()
$281
This Southwest deal was found by Cheapflights users on 6/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/163:50 pm
PHX
- DEN
1 stop3h 15m
Southwest
Tue 7/219:35 am
DEN
- PHX
2 stops6h 15m
Southwest
Deal found 6/4![Southwest logo]()
$282
This Southwest deal was found by Cheapflights users on 6/1. 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 7/33:50 pm
PHX
- DEN
1 stop3h 15m
Southwest
Tue 7/74:30 pm
DEN
- PHX
1 stop4h 00m
Southwest
Deal found 6/1![Southwest logo]()
$289
This Southwest deal was found by Cheapflights users on 6/3. 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.
Wed 6/247:30 am
PHX
- DEN
Nonstop1h 45m
Southwest
Sun 6/287:50 am
DEN
- PHX
Nonstop1h 55m
Southwest
Deal found 6/3![Southwest logo]()
$292
This Southwest deal was found by Cheapflights users on 6/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:55 pm
PHX
- DEN
2 stops6h 05m
Southwest
Tue 7/2811:00 am
DEN
- PHX
1 stop3h 40m
Southwest
Deal found 6/4![Southwest logo]()
$300
Last-minute flights from Sky Harbor Intl to BoulderDiscover last-minute flight deals from Sky Harbor Intl to Boulder. Data last updated June 5, 2026 and is based on user searches.
Discover last-minute flight deals from Sky Harbor Intl to Boulder. Data last updated June 5, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/68:40 am
PHX
- DEN
Nonstop1h 57m
Frontier
Tue 6/3012:22 pm
DEN
- PHX
Nonstop1h 58m
Frontier
Deal found 6/2![Frontier logo]()
$115
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/136:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Wed 6/249:15 am
DEN
- PHX
Nonstop2h 01m
Frontier
Deal found 6/3![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 6/2. 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.
Tue 6/1611:21 am
PHX
- DEN
Nonstop1h 54m
Frontier
Tue 6/232:47 pm
DEN
- PHX
Nonstop2h 01m
Frontier
Deal found 6/2![Frontier logo]()
$128
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Sat 6/2710:36 pm
DEN
- PHX
Nonstop1h 53m
Frontier
Deal found 6/5![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 6/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/274:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Sat 6/2710:36 pm
DEN
- PHX
Nonstop1h 53m
Frontier
Deal found 6/3![Frontier logo]()
$123
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/302:15 pm
PHX
- DEN
Nonstop1h 55m
Frontier
Sat 7/42:47 pm
DEN
- PHX
Nonstop2h 01m
Frontier
Deal found 6/3![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 6/2. 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.
Tue 7/74:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Sat 7/1110:36 pm
DEN
- PHX
Nonstop1h 56m
Frontier
Deal found 6/2![Frontier logo]()
$122
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/144:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Mon 7/206:45 am
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/3![Frontier logo]()
$125
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Wed 7/222:45 pm
DEN
- PHX
Nonstop1h 58m
Frontier
Deal found 6/3![Frontier logo]()
$113
This Frontier deal was found by Cheapflights users on 6/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/266:40 am
PHX
- DEN
Nonstop1h 59m
Frontier
Tue 8/412:22 pm
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/3![Frontier logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/294:48 pm
PHX
- DEN
Nonstop1h 58m
Frontier
Wed 8/55:23 pm
DEN
- PHX
1 stop6h 57m
Frontier
Deal found 6/3![Frontier logo]()
$112
This Frontier deal was found by Cheapflights users on 6/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/306:53 pm
PHX
- DEN
Nonstop1h 56m
Frontier
Tue 8/412:22 pm
DEN
- PHX
Nonstop1h 55m
Frontier
Deal found 6/3![Frontier logo]()
$117
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 June 5, 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 June 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:45 pm
PHX
- DEN
1 stop6h 45m
Frontier
Deal found 6/3![Frontier logo]()
$57
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/3010:32 pm
PHX
- DEN
1 stop9h 43m
Frontier
Deal found 6/3![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 6/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/711:35 am
PHX
- DEN
1 stop10h 47m
Frontier
Deal found 6/3![Frontier logo]()
$59
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Deal found 6/4![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 6/1. 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 8/1311:35 am
PHX
- DEN
1 stop8h 37m
Frontier
Deal found 6/1![Frontier logo]()
$65
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1411:19 am
PHX
- DEN
Nonstop1h 56m
Frontier
Deal found 6/4![Frontier logo]()
$68
This Cheapflightsfares deal was found by Cheapflights users on 6/4. 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 8/16:53 pm
PHX
- DEN
Nonstop1h 56m
Frontier
Deal found 6/4![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/32:16 pm
PHX
- DEN
1 stop18h 47m
Frontier
Deal found 6/4![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/46:53 pm
PHX
- DEN
Nonstop1h 53m
Frontier
Deal found 6/4![Frontier logo]()
$75
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 June 5, 2026.
Round-trip from | $112 (Kiwi.com) |
|---|---|
One-way from | $57 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $220 |
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 June 5, 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
Wed 7/22
3:13 pm-11:30 pm
1 stop7h 17m
Denver Intl
Wed 7/29
6:00 am-12:23 pm
1 stop7h 23m
$217
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Wed 6/24
3:13 pm-11:30 pm
1 stop7h 17m
Denver Intl
Tue 6/30
6:00 am-12:23 pm
1 stop7h 23m
$233
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Wed 7/22
6:53 pm-10:33 am
1 stop14h 40m
Denver Intl
Fri 7/24
7:59 pm-12:23 pm
1 stop17h 24m
$234
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Thu 9/17
3:15 pm-11:44 pm
1 stop7h 29m
Denver Intl
Sun 9/20
6:17 am-11:31 am
1 stop6h 14m
$251
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Sat 10/17
5:35 am-1:30 pm
2 stops6h 55m
Denver Intl
Tue 10/20
8:50 am-11:05 am
1 stop3h 15m
$257
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Tue 6/30
8:10 am-1:35 pm
1 stop4h 25m
Denver Intl
Tue 7/7
9:35 am-2:50 pm
2 stops6h 15m
$270
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Wed 7/1
1:25 pm-5:45 pm
1 stop3h 20m
Denver Intl
Sat 7/11
7:45 am-1:00 pm
2 stops6h 15m
$281
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Thu 7/16
3:50 pm-8:05 pm
1 stop3h 15m
Denver Intl
Tue 7/21
9:35 am-2:50 pm
2 stops6h 15m
$282
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Fri 7/3
3:50 pm-8:05 pm
1 stop3h 15m
Denver Intl
Tue 7/7
4:30 pm-7:30 pm
1 stop4h 00m
$289
Quickest round-trip
PhoenixDenver
PHX - DEN
PHXDEN
Phoenix Sky Harbor Intl
Wed 6/24
7:30 am-10:15 am
Nonstop1h 45m
Denver Intl
Sun 6/28
7:50 am-8:45 am
Nonstop1h 55m
$292
Showing 1-10 of 21 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 June 5, 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 27% 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 June 5, 2026.
The most flights from PHX to BD9 are scheduled on a Monday (43 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (13 on average).
How much does it cost to fly round-trip from Phoenix Sky Harbor Intl Airport to Boulder?
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 May 30, 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 June 5, 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.
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
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
Browse other Sky Harbor Intl and Boulder flight options. Last updated on June 5, 2026.
Other flights from Sky Harbor Intl
Browse through other flights departing from Sky Harbor Intl. Flights are based on user searches made on Cheapflights and were last updated on June 5, 2026.
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Sky Harbor Intl to Boulder flights
Consider these flights traveling from Sky Harbor Intl to Boulder.
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 June 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$64 | Average$154 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$137 | Average$240 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$139 | Average$357 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$155 | Average$314 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$185 | Average$292 | FlexibilityNo cancel fee | On-timeN/A |