$76+ Cheap flights from Portland (PDX) 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 6/27. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — DEN
Apr 9 — Apr 161
Round-trip
1 adult, Economy
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Find cheap flights from Portland 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 Portland to Boulder are usually found in August or September, booked 29 days in advance, depart on a Friday or Thursday and return on a Saturday
Cheap flight deals from Portland to Boulder
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Best
Last-minute
One-way
Cheapest flights from Portland to BoulderExplore the most affordable flight options available from Portland to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.
Explore the most affordable flight options available from Portland to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/1311:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Wed 4/159:45 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/7![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 4/1611:48 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 4/179:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/9![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/3011:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Sun 5/38:24 am
DEN
- PDX
Nonstop2h 56m
Frontier
Deal found 3/10![Frontier logo]()
$87
This Frontier deal was found by Cheapflights users on 3/8. 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 4/1311:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Sat 4/189:49 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/8![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/411:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 5/159:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/5![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/141:48 pm
PDX
- DEN
Nonstop2h 41m
Frontier
Thu 4/239:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/7![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/1311:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 4/179:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/7![Frontier logo]()
$96
This Super.com deal was found by Cheapflights users on 3/6. 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.
Fri 6/53:12 pm
PDX
- DEN
Nonstop2h 44m
Frontier
Mon 6/89:25 am
DEN
- PDX
Nonstop2h 48m
Frontier
Deal found 3/6![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 3/9. 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 8/173:12 pm
PDX
- DEN
Nonstop2h 44m
Frontier
Tue 8/259:25 am
DEN
- PDX
Nonstop2h 48m
Frontier
Deal found 3/9![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 3/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/51:48 pm
PDX
- DEN
Nonstop2h 41m
Frontier
Sat 5/169:49 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/5![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 5/159:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/5![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 3/8. 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 4/141:48 pm
PDX
- DEN
Nonstop2h 41m
Frontier
Mon 4/209:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/8![Frontier logo]()
$102
Best flights from Portland to BoulderDiscover carefully curated flight deals from Portland to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 10, 2026.
Discover carefully curated flight deals from Portland to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 10, 2026.
This Delta deal was found by Cheapflights users on 3/8. 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 4/146:05 pm
PDX
- DEN
1 stop4h 45m
Delta
Tue 4/217:45 pm
DEN
- PDX
1 stop5h 11m
Delta
Deal found 3/8![Delta logo]()
$165
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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.
Mon 4/137:30 am
PDX
- DEN
2 stops15h 14m
Alaska Airlines
Fri 4/176:20 pm
DEN
- PDX
1 stop6h 39m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$255
This United Airlines deal was found by Cheapflights users on 3/9. 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 4/27:05 pm
PDX
- DEN
Nonstop2h 40m
United Airlines
Sat 4/48:00 am
DEN
- PDX
Nonstop2h 48m
United Airlines
Deal found 3/9![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 3/9. 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 3/315:25 am
PDX
- DEN
2 stops9h 10m
Southwest
Thu 4/23:45 pm
DEN
- PDX
2 stops7h 40m
Southwest
Deal found 3/9![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 3/7. 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 5/155:51 pm
PDX
- DEN
1 stop5h 01m
Delta
Sun 5/175:40 am
DEN
- PDX
1 stop4h 12m
Delta
Deal found 3/7![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 3/9. 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.
Wed 4/151:32 pm
PDX
- DEN
2 stops7h 57m
Delta
Tue 4/218:10 am
DEN
- PDX
2 stops11h 42m
Delta
Deal found 3/9![Delta logo]()
$224
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 4/22:47 pm
PDX
- DEN
Nonstop2h 41m
Alaska Airlines
Sun 4/57:25 am
DEN
- PDX
1 stop27h 24m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$270
This Southwest deal was found by Cheapflights users on 3/6. 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 5/1511:35 am
PDX
- DEN
1 stop5h 30m
Southwest
Mon 5/184:25 pm
DEN
- PDX
2 stops7h 15m
Southwest
Deal found 3/6![Southwest logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 4/73:42 pm
PDX
- DEN
1 stop7h 14m
Alaska Airlines
Thu 4/96:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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.
Mon 3/302:30 pm
PDX
- DEN
1 stop8h 14m
Alaska Airlines
Tue 3/316:03 pm
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$302
This Southwest deal was found by Cheapflights users on 3/5. 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.
Mon 5/186:00 am
PDX
- DEN
2 stops7h 40m
Southwest
Thu 5/215:50 am
DEN
- PDX
1 stop5h 55m
Southwest
Deal found 3/5![Southwest logo]()
$362
This Delta deal was found by Cheapflights users on 3/8. 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.
Sat 5/25:59 pm
PDX
- DEN
1 stop4h 51m
Delta
Tue 5/58:10 am
DEN
- PDX
2 stops10h 00m
Delta
Deal found 3/8![Delta logo]()
$350
Last-minute flights from Portland to BoulderDiscover last-minute flight deals from Portland to Boulder. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Boulder. Data last updated March 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/1311:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Wed 4/159:45 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/7![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 3/8. 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 4/1311:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Sat 4/189:49 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/8![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/1311:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 4/179:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/7![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/141:48 pm
PDX
- DEN
Nonstop2h 41m
Frontier
Thu 4/239:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/7![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/8. 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 4/141:48 pm
PDX
- DEN
Nonstop2h 41m
Frontier
Mon 4/209:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/8![Frontier logo]()
$102
This Cheapflightsfares deal was found by Cheapflights users on 3/6. 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 4/141:48 pm
PDX
- DEN
Nonstop2h 41m
Frontier
Sat 4/189:30 pm
DEN
- PDX
1 stop15h 20m
Frontier
Deal found 3/6![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 4/1611:48 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 4/179:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/9![Frontier logo]()
$85
This Cheapflightsfares deal was found by Cheapflights users on 3/8. 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 4/1611:48 am
PDX
- DEN
Nonstop2h 38m
Frontier
Mon 4/209:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/8![Frontier logo]()
$106
This Super.com deal was found by Cheapflights users on 3/8. 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 4/1812:27 pm
PDX
- DEN
Nonstop2h 40m
Frontier
Sat 4/259:49 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/8![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 4/3011:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Sun 5/38:24 am
DEN
- PDX
Nonstop2h 56m
Frontier
Deal found 3/10![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:58 am
PDX
- DEN
Nonstop2h 38m
Frontier
Fri 5/159:10 am
DEN
- PDX
Nonstop2h 53m
Frontier
Deal found 3/5![Frontier logo]()
$101
One-way flights from Portland to BoulderSearch for one-way flight options from Portland to Boulder. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
Search for one-way flight options from Portland to Boulder. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 3/8. 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 6/273:12 pm
PDX
- DEN
Nonstop2h 44m
Frontier
Deal found 3/8![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/263:12 pm
PDX
- DEN
Nonstop2h 44m
Frontier
Deal found 3/5![Frontier logo]()
$77
This Cheapflightsfares deal was found by Cheapflights users on 3/10. 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.
Sun 5/313:12 pm
PDX
- DEN
Nonstop2h 44m
Frontier
Deal found 3/10![Frontier logo]()
$78
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Wed 4/85:00 am
PDX
- DEN
Nonstop2h 38m
United Airlines
Deal found 3/9![United Airlines logo]()
$79
This Cheapflightsfares deal was found by Cheapflights users on 3/6. 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 5/79:53 am
PDX
- DEN
1 stop6h 56m
Frontier
Deal found 3/6![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 5/233:12 pm
PDX
- DEN
Nonstop2h 44m
Frontier
Deal found 3/10![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 5/412:45 pm
PDX
- DEN
1 stop14h 14m
Frontier
Deal found 3/6![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 3/7. 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 5/1411:48 am
PDX
- DEN
Nonstop2h 38m
Frontier
Deal found 3/7![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 3/7. 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.
Sun 4/128:39 pm
PDX
- DEN
1 stop26h 41m
Frontier
Deal found 3/7![Frontier logo]()
$85
This Cheapflightsfares deal was found by Cheapflights users on 3/6. 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.
Mon 4/279:54 am
PDX
- DEN
1 stop24h 40m
Frontier
Deal found 3/6![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 7/812:23 pm
PDX
- DEN
Nonstop2h 40m
Frontier
Deal found 3/10![Frontier logo]()
$87
Find flight deals from Portland to Boulder
Keep the following information in mind while searching for Portland to Boulder flight deals. Data was last updated March 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $80 (Kiwi.com) |
One-way from | $76 (Cheapflightsfares) |
Popular in | March |
Cheapest in | August |
Average price | $267 |
Cheapflights Fare Finder
Customize your flight search to find flights from Portland 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 March 10, 2026.
Use the filters below to find and compare flights from Portland to Boulder that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PortlandDenver
PDX - DEN
PDXDEN
Portland
Tue 4/14
6:05 pm-11:50 pm
1 stop4h 45m
Denver Intl
Tue 4/21
7:45 pm-11:56 pm
1 stop5h 11m
$165
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 5/15
5:51 pm-11:52 pm
1 stop5h 01m
Denver Intl
Sun 5/17
5:40 am-8:52 am
1 stop4h 12m
$197
PortlandDenver
PDX - DEN
PDXDEN
Portland
Wed 4/15
1:32 pm-10:29 pm
2 stops7h 57m
Denver Intl
Tue 4/21
8:10 am-6:52 pm
2 stops11h 42m
$224
PortlandDenver
PDX - DEN
PDXDEN
Portland
Mon 4/13
7:30 am-11:44 pm
2 stops15h 14m
Denver Intl
Fri 4/17
6:20 pm-11:59 pm
1 stop6h 39m
$255
Quickest round-trip
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 4/2
7:05 pm-10:45 pm
Nonstop2h 40m
Denver Intl
Sat 4/4
8:00 am-9:48 am
Nonstop2h 48m
$257
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 4/2
2:47 pm-6:28 pm
Nonstop2h 41m
Denver Intl
Sun 4/5
7:25 am-9:49 am
1 stop27h 24m
$270
PortlandDenver
PDX - DEN
PDXDEN
Portland
Tue 3/31
5:25 am-3:35 pm
2 stops9h 10m
Denver Intl
Thu 4/2
3:45 pm-10:25 pm
2 stops7h 40m
$282
PortlandDenver
PDX - DEN
PDXDEN
Portland
Tue 4/7
3:42 pm-11:56 pm
1 stop7h 14m
Denver Intl
Thu 4/9
6:03 pm-7:52 pm
Nonstop2h 49m
$297
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 5/15
11:35 am-6:05 pm
1 stop5h 30m
Denver Intl
Mon 5/18
4:25 pm-10:40 pm
2 stops7h 15m
$302
PortlandDenver
PDX - DEN
PDXDEN
Portland
Mon 3/30
2:30 pm-11:44 pm
1 stop8h 14m
Denver Intl
Tue 3/31
6:03 pm-7:52 pm
Nonstop2h 49m
$302
Showing 1-10 of 22 resultsSorted by cheapest first
Best time to book a flight from Portland to Boulder
Have a flexible travel schedule? Discover the best time to fly to Boulder from Portland with our price prediction graph.
PDX-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 Portland to Boulder
PDX-BD9
PDX-DEN
How far ahead should I book a flight from Portland to Boulder?
Use this chart to determine the optimal time to book a round-trip flight from Portland to Boulder. Price data was last updated on March 6, 2026.
To ensure you get the cheapest price possible for a flight from Portland to Boulder, you should look to book at least 29 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 Portland to Boulder?
Currently, April is the cheapest month in which you can book a flight from Portland to Boulder (average of $56). Flying from Portland to Boulder in February is currently the most expensive (average of $137). 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 PDX to BD9?
Find hourly flight availability from Portland 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 March 10, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 13% on flights from Portland to Boulder by exploring options for tickets in the evening.
What is the cheapest day to fly from Portland to Boulder?
Use this chart to determine the cheapest time to fly round-trip from Portland to Boulder. Price data was last updated on February 21, 2026.
Travelers seeking maximum savings on their Portland to Boulder flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Portland to Boulder
Explore weekly flight availability from Portland 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 March 10, 2026.
The most flights from PDX to BD9 are scheduled on a Monday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 on average).
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 March 10, 2026.
Read through reviews of airlines operating flights from Portland to Boulder, such as Alaska Airlines,Southwest, andHawaiian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.1
Comfort
7.8
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.1
Comfort
7.8
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.1
Comfort
7.8
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.1
Comfort
7.8
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.1
Comfort
7.8
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.1
Comfort
7.8
Overall
8.0
Boarding
8.1
Entertainment
7.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Related info for your journey
Find useful and relevant information for your journey from Portland 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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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Portland to Boulder
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Boulder by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Portland to Boulder by cabin class
Find flights from Portland to Boulder, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Portland and Boulder flights
Browse other Portland and Boulder flight options. Last updated on March 10, 2026.
Other flights from Portland
Browse through other flights departing from Portland. Flights are based on user searches made on Cheapflights and were last updated on March 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Portland to Boulder flights
Consider these flights traveling from Portland to Boulder.
Top 6 airlines flying from Portland to Boulder
Discover the top 6 airlines that operate flights from Portland 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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$57 | Average$153 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$254 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$88 | Average$210 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$138 | Average$378 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$140 | Average$251 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$147 | Average$314 | FlexibilityNo cancel fee | On-time63% |