$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
Aug 23 — Aug 301
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 January or August, booked 77 days in advance, depart on a Thursday or Friday 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 July 24, 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 July 24, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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
Mon 8/173:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/22![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/135:30 pm
PDX
- DEN
1 stop15h 10m
Frontier
Wed 9/1612:37 pm
DEN
- PDX
Nonstop2h 50m
Frontier
Deal found 7/21![Frontier logo]()
$192
This Frontier deal was found by Cheapflights users on 7/21. 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 9/105:30 pm
PDX
- DEN
1 stop5h 55m
Frontier
Tue 9/1512:37 pm
DEN
- PDX
Nonstop2h 50m
Frontier
Deal found 7/21![Frontier logo]()
$193
This Cheapflightsfares deal was found by Cheapflights users on 7/23. 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 8/1712:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 8/313:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/23![Frontier logo]()
$194
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com 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 8/143:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/19![Frontier logo]()
$195
This Cheapflightsfares deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1312:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Sat 8/153:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/19![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:56 pm
PDX
- DEN
1 stop15h 07m
Frontier
Wed 9/912:37 pm
DEN
- PDX
Nonstop2h 50m
Frontier
Deal found 7/20![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/2012:20 pm
PDX
- DEN
Nonstop2h 43m
Multiple Airlines
Fri 8/2812:05 pm
DEN
- PDX
Nonstop2h 43m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$199
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:21 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Tue 8/112:50 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 7/19![Frontier logo]()
$200
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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 8/175:49 pm
PDX
- DEN
1 stop23h 11m
Frontier
Mon 8/243:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/22![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:56 pm
PDX
- DEN
1 stop29h 48m
Frontier
Mon 9/73:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/22![Frontier logo]()
$202
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 July 24, 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 July 24, 2026.
This Delta deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:29 am
PDX
- DEN
1 stop7h 19m
Delta
Thu 8/271:21 pm
DEN
- PDX
1 stop7h 23m
Delta
Deal found 7/19![Delta logo]()
$247
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/137:35 pm
PDX
- DEN
Nonstop2h 30m
Southwest
Mon 8/244:10 pm
DEN
- PDX
2 stops7h 00m
Southwest
Deal found 7/23![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 7/20. 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 8/299:45 am
PDX
- DEN
1 stop4h 17m
Delta
Sun 8/306:20 am
DEN
- PDX
1 stop6h 25m
Delta
Deal found 7/20![Delta logo]()
$247
This Southwest deal was found by Cheapflights users on 7/23. 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 8/175:00 am
PDX
- DEN
2 stops7h 55m
Southwest
Sat 8/227:35 am
DEN
- PDX
1 stop8h 35m
Southwest
Deal found 7/23![Southwest logo]()
$272
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/67:00 am
PDX
- DEN
1 stop5h 00m
Delta
Thu 10/86:20 am
DEN
- PDX
1 stop6h 49m
Delta
Deal found 7/22![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/121:35 pm
PDX
- DEN
2 stops8h 10m
Southwest
Sun 9/136:20 am
DEN
- PDX
1 stop6h 00m
Southwest
Deal found 7/19![Southwest logo]()
$277
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/243:21 pm
PDX
- DEN
1 stop7h 26m
Delta
Sun 9/276:00 am
DEN
- PDX
1 stop5h 40m
Delta
Deal found 7/23![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 7/21. 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 10/216:00 am
PDX
- DEN
2 stops7h 00m
Southwest
Sun 10/258:25 am
DEN
- PDX
1 stop5h 00m
Southwest
Deal found 7/21![Southwest logo]()
$283
This Delta deal was found by Cheapflights users on 7/23. 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 9/255:10 pm
PDX
- DEN
1 stop4h 30m
Delta
Mon 9/286:00 am
DEN
- PDX
1 stop5h 40m
Delta
Deal found 7/23![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/28:50 am
PDX
- DEN
1 stop5h 20m
Southwest
Sun 10/46:25 pm
DEN
- PDX
2 stops7h 35m
Southwest
Deal found 7/23![Southwest logo]()
$302
This Southwest deal was found by Cheapflights users on 7/22. 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 8/1511:20 am
PDX
- DEN
1 stop5h 10m
Southwest
Mon 8/171:15 pm
DEN
- PDX
2 stops7h 05m
Southwest
Deal found 7/22![Southwest logo]()
$304
This Southwest deal was found by Cheapflights users on 7/21. 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.
Sun 9/66:35 am
PDX
- DEN
2 stops7h 10m
Southwest
Tue 9/81:30 pm
DEN
- PDX
1 stop6h 30m
Southwest
Deal found 7/21![Southwest logo]()
$307
Last-minute flights from Portland to BoulderDiscover last-minute flight deals from Portland to Boulder. Data last updated July 24, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Boulder. Data last updated July 24, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:21 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Tue 8/112:50 pm
DEN
- PDX
Nonstop2h 41m
Frontier
Deal found 7/19![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/105:49 pm
PDX
- DEN
1 stop5h 16m
Frontier
Tue 9/13:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/20![Frontier logo]()
$197
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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
Mon 8/173:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/22![Frontier logo]()
$191
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com 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 8/143:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/19![Frontier logo]()
$195
This Cheapflightsfares deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1312:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Sat 8/153:08 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/19![Frontier logo]()
$196
This Cheapflightsfares deal was found by Cheapflights users on 7/23. 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 8/1712:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Mon 8/313:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/23![Frontier logo]()
$194
This Cheapflightsfares deal was found by Cheapflights users on 7/22. 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 8/175:49 pm
PDX
- DEN
1 stop23h 11m
Frontier
Mon 8/243:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/22![Frontier logo]()
$201
This Frontier deal was found by Cheapflights users on 7/23. 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 8/185:56 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Fri 8/213:28 pm
DEN
- PDX
Nonstop2h 43m
Frontier
Deal found 7/23![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/2012:20 pm
PDX
- DEN
Nonstop2h 43m
Frontier
Thu 8/2710:39 pm
DEN
- PDX
1 stop13h 56m
Frontier
Deal found 7/22![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/2012:20 pm
PDX
- DEN
Nonstop2h 43m
Multiple Airlines
Fri 8/2812:05 pm
DEN
- PDX
Nonstop2h 43m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/205:58 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Wed 9/23:28 pm
DEN
- PDX
Nonstop2h 43m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$202
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 July 24, 2026.
Search for one-way flight options from Portland to Boulder. Find affordable one-way fares based on user searches. Data last updated July 24, 2026.
This Alaska Airlines deal was found by Cheapflights users on 7/22. 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 11/145:49 pm
PDX
- DEN
Nonstop2h 39m
Alaska Airlines
Deal found 7/22![Alaska Airlines logo]()
$109
This United Airlines deal was found by Cheapflights users on 7/20. 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 8/193:43 pm
PDX
- DEN
1 stop6h 59m
United Airlines
Deal found 7/20![United Airlines logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 7/24. 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 9/2111:02 am
PDX
- DEN
1 stop21h 30m
Frontier
Deal found 7/24![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:30 pm
PDX
- DEN
1 stop29h 55m
Frontier
Deal found 7/22![Frontier logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:48 pm
PDX
- DEN
Nonstop2h 37m
Alaska Airlines
Deal found 7/21![Alaska Airlines logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/271:47 pm
PDX
- DEN
1 stop6h 54m
Frontier
Deal found 7/22![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/231:47 pm
PDX
- DEN
1 stop13h 01m
Frontier
Deal found 7/22![Frontier logo]()
$123
This Delta deal was found by Cheapflights users on 7/22. 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 8/221:15 pm
PDX
- DEN
1 stop5h 46m
Delta
Deal found 7/22![Delta logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/175:49 pm
PDX
- DEN
1 stop8h 59m
Frontier
Deal found 7/23![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/239:34 pm
PDX
- DEN
1 stop19h 09m
Frontier
Deal found 7/22![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:47 pm
PDX
- DEN
1 stop6h 54m
Frontier
Deal found 7/19![Frontier logo]()
$127
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 July 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $191 (Cheapflightsfares) |
One-way from | $109 (Alaska Airlines) |
Popular in | June |
Cheapest in | January |
Average price | $280 |
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 July 24, 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 8/25
9:29 am-5:48 pm
1 stop7h 19m
Denver Intl
Thu 8/27
1:21 pm-7:44 pm
1 stop7h 23m
$247
PortlandDenver
PDX - DEN
PDXDEN
Portland
Sat 8/29
9:45 am-3:02 pm
1 stop4h 17m
Denver Intl
Sun 8/30
6:20 am-11:45 am
1 stop6h 25m
$247
PortlandDenver
PDX - DEN
PDXDEN
Portland
Tue 10/6
7:00 am-1:00 pm
1 stop5h 00m
Denver Intl
Thu 10/8
6:20 am-12:09 pm
1 stop6h 49m
$257
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 9/24
3:21 pm-11:47 pm
1 stop7h 26m
Denver Intl
Sun 9/27
6:00 am-10:40 am
1 stop5h 40m
$257
Quickest round-trip
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 8/13
7:35 pm-11:05 pm
Nonstop2h 30m
Denver Intl
Mon 8/24
4:10 pm-10:10 pm
2 stops7h 00m
$267
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 9/25
5:10 pm-10:40 pm
1 stop4h 30m
Denver Intl
Mon 9/28
6:00 am-10:40 am
1 stop5h 40m
$267
PortlandDenver
PDX - DEN
PDXDEN
Portland
Mon 8/17
5:00 am-1:55 pm
2 stops7h 55m
Denver Intl
Sat 8/22
7:35 am-3:10 pm
1 stop8h 35m
$272
PortlandDenver
PDX - DEN
PDXDEN
Portland
Sat 9/12
1:35 pm-10:45 pm
2 stops8h 10m
Denver Intl
Sun 9/13
6:20 am-11:20 am
1 stop6h 00m
$277
PortlandDenver
PDX - DEN
PDXDEN
Portland
Wed 10/21
6:00 am-2:00 pm
2 stops7h 00m
Denver Intl
Sun 10/25
8:25 am-12:25 pm
1 stop5h 00m
$283
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 10/2
8:50 am-3:10 pm
1 stop5h 20m
Denver Intl
Sun 10/4
6:25 pm-1:00 am
2 stops7h 35m
$302
Showing 1-10 of 24 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 July 24, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 15% 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 July 24, 2026.
The most flights from PDX to BD9 are scheduled on a Monday (22 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?
Airfare is typical for this route at the moment.
Portland to Boulder flights typically cost between $186 and $313 in August.The cheapest round-trip price found within the last 5 days was $191 on Frontier (Aug 11-Aug 14).
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 July 18, 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. Monday mornings 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 July 24, 2026.
Read through reviews of airlines operating flights from Portland to Boulder, such as Southwest,Alaska Airlines, andHawaiian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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
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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 July 24, 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 July 24, 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 July 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$174 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$286 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$88 | Average$207 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$126 | Average$256 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$143 | Average$274 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$147 | Average$334 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$147 | Average$394 | FlexibilityNo cancel fee | On-time69% |