$109+ 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 11/14. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — DEN
Jul 13 — Jul 201
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 83 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 June 13, 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 June 13, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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.
Fri 7/2412:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 7/273:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 6/10![Frontier logo]()
$196
This deal was found by Cheapflights users on 6/9. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/212:26 pm
PDX
- DEN
Nonstop2h 42m
Frontier
Tue 7/72:50 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 6/9![Frontier logo]()
$198
This Flightnetwork deal was found by Cheapflights users on 6/9. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2312:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 7/273:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 6/9![Frontier logo]()
$199
This Southwest deal was found by Cheapflights users on 6/9. 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 8/251:05 pm
PDX
- DEN
2 stops7h 15m
Southwest
Tue 9/14:10 pm
DEN
- PDX
Nonstop2h 35m
Southwest
Deal found 6/9![Southwest logo]()
$200
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 8/115:16 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Fri 8/144:20 pm
DEN
- PDX
1 stop20h 15m
Frontier
Deal found 6/11![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 8/66:04 pm
PDX
- DEN
Nonstop2h 36m
Multiple Airlines
Thu 8/133:08 pm
DEN
- PDX
Nonstop2h 43m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$202
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/185:54 pm
PDX
- DEN
1 stop5h 04m
Delta
Wed 8/266:43 pm
DEN
- PDX
1 stop6h 13m
Delta
Deal found 6/10![Delta logo]()
$203
This United Airlines deal was found by Cheapflights users on 6/9. 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 8/56:50 pm
PDX
- DEN
Nonstop2h 38m
United Airlines
Mon 8/109:30 pm
DEN
- PDX
Nonstop2h 45m
United Airlines
Deal found 6/9![United Airlines logo]()
$204
This Booking.com deal was found by Cheapflights users on 6/12. 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.
Wed 8/265:42 pm
PDX
- DEN
Nonstop2h 41m
Multiple Airlines
Fri 8/281:43 pm
DEN
- PDX
1 stop5h 54m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:03 am
PDX
- DEN
Nonstop2h 49m
Multiple Airlines
Thu 9/242:45 pm
DEN
- PDX
Nonstop2h 50m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 8/192:03 pm
PDX
- DEN
1 stop6h 10m
Multiple Airlines
Sun 8/233:10 pm
DEN
- PDX
Nonstop2h 47m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$207
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 June 13, 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 June 13, 2026.
This Delta deal was found by Cheapflights users on 6/11. 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 9/161:20 pm
PDX
- DEN
1 stop5h 10m
Delta
Sat 9/191:00 pm
DEN
- PDX
1 stop4h 05m
Delta
Deal found 6/11![Delta logo]()
$220
This Alaska Airlines deal was found by Cheapflights users on 6/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:00 pm
PDX
- DEN
Nonstop2h 36m
Alaska Airlines
Wed 10/287:05 am
DEN
- PDX
1 stop7h 22m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$227
This United Airlines deal was found by Cheapflights users on 6/12. 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 9/34:07 pm
PDX
- DEN
Nonstop2h 38m
United Airlines
Mon 9/77:20 pm
DEN
- PDX
Nonstop2h 45m
United Airlines
Deal found 6/12![United Airlines logo]()
$254
This Southwest deal was found by Cheapflights users on 6/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:20 am
PDX
- DEN
2 stops8h 00m
Southwest
Wed 9/309:00 am
DEN
- PDX
2 stops7h 25m
Southwest
Deal found 6/8![Southwest logo]()
$281
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/165:54 pm
PDX
- DEN
1 stop5h 04m
Delta
Wed 8/196:20 am
DEN
- PDX
1 stop5h 22m
Delta
Deal found 6/10![Delta logo]()
$223
This Delta deal was found by Cheapflights users on 6/9. 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.
Thu 8/139:45 am
PDX
- DEN
1 stop4h 17m
Delta
Sun 8/166:20 am
DEN
- PDX
1 stop5h 22m
Delta
Deal found 6/9![Delta logo]()
$243
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/185:50 pm
PDX
- DEN
1 stop5h 04m
Delta
Mon 9/216:20 am
DEN
- PDX
1 stop6h 36m
Delta
Deal found 6/11![Delta logo]()
$243
This Southwest deal was found by Cheapflights users on 6/12. 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 9/226:35 am
PDX
- DEN
2 stops7h 35m
Southwest
Sat 9/2610:55 am
DEN
- PDX
1 stop6h 45m
Southwest
Deal found 6/12![Southwest logo]()
$312
This Delta deal was found by Cheapflights users on 6/9. 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.
Mon 8/175:54 pm
PDX
- DEN
1 stop5h 04m
Delta
Mon 8/316:20 am
DEN
- PDX
1 stop5h 22m
Delta
Deal found 6/9![Delta logo]()
$243
This Southwest deal was found by Cheapflights users on 6/12. 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 9/27:05 am
PDX
- DEN
1 stop7h 05m
Southwest
Mon 9/74:10 pm
DEN
- PDX
2 stops7h 00m
Southwest
Deal found 6/12![Southwest logo]()
$327
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/315:50 pm
PDX
- DEN
1 stop4h 54m
Delta
Tue 8/46:20 am
DEN
- PDX
1 stop5h 22m
Delta
Deal found 6/10![Delta logo]()
$255
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:20 am
PDX
- DEN
1 stop5h 26m
Delta
Tue 7/75:40 am
DEN
- PDX
1 stop3h 57m
Delta
Deal found 6/10![Delta logo]()
$307
Last-minute flights from Portland to BoulderDiscover last-minute flight deals from Portland to Boulder. Data last updated June 13, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Boulder. Data last updated June 13, 2026 and is based on user searches.
This deal was found by Cheapflights users on 6/9. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/212:26 pm
PDX
- DEN
Nonstop2h 42m
Frontier
Tue 7/72:50 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 6/9![Frontier logo]()
$198
This Super.com deal was found by Cheapflights users on 6/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/85:21 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Wed 7/152:55 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 6/10![Frontier logo]()
$228
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 7/225:21 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Tue 7/282:50 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 6/11![Frontier logo]()
$206
This Flightnetwork deal was found by Cheapflights users on 6/9. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2312:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 7/273:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 6/9![Frontier logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 7/2312:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Tue 7/282:50 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 6/9![Frontier logo]()
$225
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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.
Fri 7/2412:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 7/273:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 6/10![Frontier logo]()
$196
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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 7/275:49 pm
PDX
- DEN
1 stop8h 59m
Frontier
Wed 8/122:55 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 6/12![Frontier logo]()
$201
This Super.com deal was found by Cheapflights users on 6/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/285:16 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 8/173:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 6/10![Frontier logo]()
$214
This Super.com deal was found by Cheapflights users on 6/8. 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.
Tue 7/285:16 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Fri 8/73:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 6/8![Frontier logo]()
$218
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 June 13, 2026.
Search for one-way flight options from Portland to Boulder. Find affordable one-way fares based on user searches. Data last updated June 13, 2026.
This CheapOair deal was found by Cheapflights users on 6/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/145:49 pm
PDX
- DEN
Nonstop2h 39m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 6/9. 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 7/2312:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Deal found 6/9![Frontier logo]()
$110
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/67:00 am
PDX
- DEN
Nonstop2h 39m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$112
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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 8/912:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Deal found 6/12![Frontier logo]()
$114
This United Airlines deal was found by Cheapflights users on 6/9. 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.
Mon 8/243:43 pm
PDX
- DEN
1 stop6h 59m
United Airlines
Deal found 6/9![United Airlines logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 6/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:18 am
PDX
- DEN
Nonstop2h 49m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$119
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/105:54 pm
PDX
- DEN
1 stop5h 04m
Delta
Deal found 6/10![Delta logo]()
$122
This United Airlines deal was found by Cheapflights users on 6/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:43 pm
PDX
- DEN
1 stop6h 59m
United Airlines
Deal found 6/8![United Airlines logo]()
$124
This Southwest deal was found by Cheapflights users on 6/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:20 am
PDX
- DEN
2 stops6h 15m
Southwest
Deal found 6/8![Southwest logo]()
$127
This Delta deal was found by Cheapflights users on 6/8. 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.
Thu 10/155:45 pm
PDX
- DEN
1 stop4h 43m
Delta
Deal found 6/8![Delta logo]()
$128
This Delta deal was found by Cheapflights users on 6/12. 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 8/285:54 pm
PDX
- DEN
1 stop5h 04m
Delta
Deal found 6/12![Delta logo]()
$129
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/57:00 am
PDX
- DEN
Nonstop2h 39m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$131
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 June 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $196 (Cheapflightsfares) |
One-way from | $109 (CheapOair) |
Popular in | March |
Cheapest in | August |
Average price | $281 |
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 June 13, 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
Wed 9/16
1:20 pm-7:30 pm
1 stop5h 10m
Denver Intl
Sat 9/19
1:00 pm-4:05 pm
1 stop4h 05m
$220
PortlandDenver
PDX - DEN
PDXDEN
Portland
Sun 8/16
5:54 pm-11:58 pm
1 stop5h 04m
Denver Intl
Wed 8/19
6:20 am-10:42 am
1 stop5h 22m
$223
PortlandDenver
PDX - DEN
PDXDEN
Portland
Sat 10/24
6:00 pm-9:36 pm
Nonstop2h 36m
Denver Intl
Wed 10/28
7:05 am-1:27 pm
1 stop7h 22m
$227
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 8/13
9:45 am-3:02 pm
1 stop4h 17m
Denver Intl
Sun 8/16
6:20 am-10:42 am
1 stop5h 22m
$243
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 9/18
5:50 pm-11:54 pm
1 stop5h 04m
Denver Intl
Mon 9/21
6:20 am-11:56 am
1 stop6h 36m
$243
PortlandDenver
PDX - DEN
PDXDEN
Portland
Mon 8/17
5:54 pm-11:58 pm
1 stop5h 04m
Denver Intl
Mon 8/31
6:20 am-10:42 am
1 stop5h 22m
$243
Quickest round-trip
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 9/3
4:07 pm-7:45 pm
Nonstop2h 38m
Denver Intl
Mon 9/7
7:20 pm-9:05 pm
Nonstop2h 45m
$254
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 7/31
5:50 pm-11:44 pm
1 stop4h 54m
Denver Intl
Tue 8/4
6:20 am-10:42 am
1 stop5h 22m
$255
PortlandDenver
PDX - DEN
PDXDEN
Portland
Mon 9/28
6:20 am-3:20 pm
2 stops8h 00m
Denver Intl
Wed 9/30
9:00 am-3:25 pm
2 stops7h 25m
$281
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 7/3
11:20 am-5:46 pm
1 stop5h 26m
Denver Intl
Tue 7/7
5:40 am-8:37 am
1 stop3h 57m
$307
Showing 1-10 of 23 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
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 June 13, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 17% on flights from Portland to Boulder by exploring options for tickets in the evening.
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 June 13, 2026.
The most flights from PDX to BD9 are scheduled on a Friday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).
How much does it cost to fly round-trip from Portland to Boulder?
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 June 8, 2026.
Travelers seeking maximum savings on their Portland to Boulder flight should consider departing on Thursday evenings when fares are most often at their lowest. Wednesday evenings 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 13, 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.
Comfort
7.8
Crew
8.5
Food
7.0
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Crew
8.5
Food
7.0
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Crew
8.5
Food
7.0
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Crew
8.5
Food
7.0
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Crew
8.5
Food
7.0
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Comfort
7.8
Crew
8.5
Food
7.0
Entertainment
7.0
Overall
7.9
Boarding
8.1
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
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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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 June 13, 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 June 13, 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 7 airlines flying from Portland to Boulder
Discover the top 7 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 June 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$159 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$260 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$98 | Average$207 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$126 | Average$244 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$140 | Average$263 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$147 | Average$305 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$147 | Average$312 | FlexibilityNo cancel fee | On-time69% |