$86+ 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 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — DEN
May 28 — Jun 41
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 Wednesday
Cheap flight deals from Portland to Boulder
Cheapest
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 April 28, 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 April 28, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 5/1412:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Wed 5/2010:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/22![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 5/1412:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Wed 5/208:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Deal found 4/22![Multiple Airlines logo]()
$134
This Cheapflightsfares deal was found by Cheapflights users on 4/26. 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 5/3012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Tue 6/23:15 pm
DEN
- PDX
Nonstop2h 46m
Frontier
Deal found 4/26![Frontier logo]()
$137
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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.
Thu 5/1412:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Sun 5/177:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Deal found 4/23![Frontier logo]()
$140
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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 5/185:31 pm
PDX
- DEN
1 stop15h 33m
Frontier
Tue 6/92:50 pm
DEN
- PDX
Nonstop2h 45m
Frontier
Deal found 4/23![Frontier logo]()
$142
This Cheapflightsfares deal was found by Cheapflights users on 4/27. 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 6/412:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Sun 6/710:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/27![Frontier logo]()
$143
This Expedia deal was found by Cheapflights users on 4/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/512:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Mon 6/88:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/265:46 pm
PDX
- DEN
Nonstop2h 52m
Frontier
Sat 5/3010:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/25![Frontier logo]()
$147
This Cheapflightsfares deal was found by Cheapflights users on 4/27. 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 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Sun 5/247:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Deal found 4/27![Frontier logo]()
$148
This Expedia deal was found by Cheapflights users on 4/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Tue 6/26:00 am
DEN
- PDX
1 stop4h 47m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$149
This Expedia deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/197:17 am
PDX
- DEN
Nonstop2h 49m
Multiple Airlines
Sat 5/233:00 pm
DEN
- PDX
Nonstop2h 46m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$153
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 April 28, 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 April 28, 2026.
This Southwest deal was found by Cheapflights users on 4/25. 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 6/47:40 pm
PDX
- DEN
Nonstop2h 25m
Southwest
Sun 6/77:50 am
DEN
- PDX
Nonstop2h 40m
Southwest
Deal found 4/25![Southwest logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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.
Fri 5/155:50 pm
PDX
- DEN
Nonstop2h 47m
Alaska Airlines
Sun 5/178:00 am
DEN
- PDX
Nonstop2h 49m
Alaska Airlines
Deal found 4/22![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 4/27. 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 6/54:15 pm
PDX
- DEN
Nonstop2h 36m
United Airlines
Mon 6/84:00 pm
DEN
- PDX
Nonstop2h 44m
United Airlines
Deal found 4/27![United Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 4/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/255:24 pm
PDX
- DEN
1 stop4h 17m
Delta
Mon 6/295:40 am
DEN
- PDX
1 stop3h 57m
Delta
Deal found 4/24![Delta logo]()
$333
This Delta deal was found by Cheapflights users on 4/25. 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 6/57:05 am
PDX
- DEN
2 stops6h 53m
Delta
Sun 6/75:40 am
DEN
- PDX
1 stop3h 59m
Delta
Deal found 4/25![Delta logo]()
$415
This Southwest deal was found by Cheapflights users on 4/23. 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.
Sun 6/2811:30 pm
PDX
- DEN
1 stop7h 50m
Southwest
Sun 7/55:55 am
DEN
- PDX
2 stops7h 20m
Southwest
Deal found 4/23![Southwest logo]()
$422
This Alaska Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/67:00 am
PDX
- DEN
Nonstop2h 50m
Alaska Airlines
Sun 5/106:00 am
DEN
- PDX
1 stop7h 52m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$437
This Southwest deal was found by Cheapflights users on 4/23. 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.
Sat 5/22:40 pm
PDX
- DEN
1 stop6h 25m
Southwest
Wed 5/68:55 am
DEN
- PDX
2 stops8h 30m
Southwest
Deal found 4/23![Southwest logo]()
$432
This Delta deal was found by Cheapflights users on 4/27. 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 5/279:20 am
PDX
- DEN
2 stops8h 55m
Delta
Sat 5/305:30 am
DEN
- PDX
1 stop4h 22m
Delta
Deal found 4/27![Delta logo]()
$465
This Southwest deal was found by Cheapflights users on 4/22. 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.
Fri 5/16:00 am
PDX
- DEN
2 stops7h 40m
Southwest
Wed 5/610:10 am
DEN
- PDX
2 stops7h 15m
Southwest
Deal found 4/22![Southwest logo]()
$482
Last-minute flights from Portland to BoulderDiscover last-minute flight deals from Portland to Boulder. Data last updated April 28, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Boulder. Data last updated April 28, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 5/1412:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Wed 5/2010:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/22![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 5/1412:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Wed 5/208:00 am
DEN
- PDX
Nonstop2h 49m
Multiple Airlines
Deal found 4/22![Multiple Airlines logo]()
$134
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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.
Thu 5/1412:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Sun 5/177:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Deal found 4/23![Frontier logo]()
$140
This Cheapflightsfares deal was found by Cheapflights users on 4/26. 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 5/149:46 pm
PDX
- DEN
1 stop10h 52m
Frontier
Thu 5/213:00 pm
DEN
- PDX
Nonstop2h 46m
Frontier
Deal found 4/26![Frontier logo]()
$143
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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 5/185:31 pm
PDX
- DEN
1 stop15h 33m
Frontier
Tue 6/92:50 pm
DEN
- PDX
Nonstop2h 45m
Frontier
Deal found 4/23![Frontier logo]()
$142
This Cheapflightsfares deal was found by Cheapflights users on 4/27. 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 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Sun 5/247:00 am
DEN
- PDX
1 stop5h 50m
Frontier
Deal found 4/27![Frontier logo]()
$148
This Expedia deal was found by Cheapflights users on 4/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Tue 6/26:00 am
DEN
- PDX
1 stop4h 47m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 4/23. 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 5/1812:35 pm
PDX
- DEN
Nonstop2h 48m
Multiple Airlines
Tue 5/1910:39 pm
DEN
- PDX
2 stops36h 41m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$154
This Expedia deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/197:17 am
PDX
- DEN
Nonstop2h 49m
Multiple Airlines
Sat 5/233:00 pm
DEN
- PDX
Nonstop2h 46m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/265:46 pm
PDX
- DEN
Nonstop2h 52m
Frontier
Sat 5/3010:39 pm
DEN
- PDX
1 stop14h 11m
Frontier
Deal found 4/25![Frontier logo]()
$147
This Cheapflightsfares deal was found by Cheapflights users on 4/26. 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 5/3012:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Tue 6/23:15 pm
DEN
- PDX
Nonstop2h 46m
Frontier
Deal found 4/26![Frontier logo]()
$137
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 April 28, 2026.
Search for one-way flight options from Portland to Boulder. Find affordable one-way fares based on user searches. Data last updated April 28, 2026.
This Booking.com deal was found by Cheapflights users on 4/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1112:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/23![Frontier logo]()
$86
This Delta deal was found by Cheapflights users on 4/23. 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.
Wed 5/135:51 pm
PDX
- DEN
1 stop5h 01m
Delta
Deal found 4/23![Delta logo]()
$90
This Super.com deal was found by Cheapflights users on 4/25. 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 5/2212:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/25![Frontier logo]()
$93
This Cheapflightsfares deal was found by Cheapflights users on 4/27. 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 6/112:35 pm
PDX
- DEN
Nonstop2h 48m
Frontier
Deal found 4/27![Frontier logo]()
$94
This Super.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:31 pm
PDX
- DEN
1 stop15h 33m
Frontier
Deal found 4/27![Frontier logo]()
$95
This United Airlines deal was found by Cheapflights users on 4/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/255:00 am
PDX
- DEN
Nonstop2h 31m
United Airlines
Deal found 4/22![United Airlines logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/315:31 pm
PDX
- DEN
1 stop6h 07m
Frontier
Deal found 4/25![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 4/23. 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.
Sun 5/245:31 pm
PDX
- DEN
1 stop15h 33m
Frontier
Deal found 4/23![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 4/24. 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 5/188:46 pm
PDX
- DEN
2 stops20h 21m
Frontier
Deal found 4/24![Frontier logo]()
$100
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 April 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Cheapflightsfares) |
One-way from | $86 (Booking.com) |
Popular in | March |
Cheapest in | August |
Average price | $232 |
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 April 28, 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
Quickest round-trip
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 6/4
7:40 pm-11:05 pm
Nonstop2h 25m
Denver Intl
Sun 6/7
7:50 am-9:30 am
Nonstop2h 40m
$237
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 5/15
5:50 pm-9:37 pm
Nonstop2h 47m
Denver Intl
Sun 5/17
8:00 am-9:49 am
Nonstop2h 49m
$287
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 6/5
4:15 pm-7:51 pm
Nonstop2h 36m
Denver Intl
Mon 6/8
4:00 pm-5:44 pm
Nonstop2h 44m
$317
PortlandDenver
PDX - DEN
PDXDEN
Portland
Thu 6/25
5:24 pm-10:41 pm
1 stop4h 17m
Denver Intl
Mon 6/29
5:40 am-8:37 am
1 stop3h 57m
$333
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 6/5
7:05 am-2:58 pm
2 stops6h 53m
Denver Intl
Sun 6/7
5:40 am-8:39 am
1 stop3h 59m
$415
PortlandDenver
PDX - DEN
PDXDEN
Portland
Sun 6/28
11:30 pm-8:20 am
1 stop7h 50m
Denver Intl
Sun 7/5
5:55 am-12:15 pm
2 stops7h 20m
$422
PortlandDenver
PDX - DEN
PDXDEN
Portland
Sat 5/2
2:40 pm-10:05 pm
1 stop6h 25m
Denver Intl
Wed 5/6
8:55 am-4:25 pm
2 stops8h 30m
$432
PortlandDenver
PDX - DEN
PDXDEN
Portland
Wed 5/6
7:00 am-10:50 am
Nonstop2h 50m
Denver Intl
Sun 5/10
6:00 am-12:52 pm
1 stop7h 52m
$437
PortlandDenver
PDX - DEN
PDXDEN
Portland
Wed 5/27
9:20 am-7:15 pm
2 stops8h 55m
Denver Intl
Sat 5/30
5:30 am-8:52 am
1 stop4h 22m
$465
PortlandDenver
PDX - DEN
PDXDEN
Portland
Fri 5/1
6:00 am-2:40 pm
2 stops7h 40m
Denver Intl
Wed 5/6
10:10 am-4:25 pm
2 stops7h 15m
$482
Showing 1-10 of 21 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 April 28, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 16% 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 April 25, 2026.
Travelers seeking maximum savings on their Portland to Boulder flight should consider departing on Friday afternoons 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 April 28, 2026.
The most flights from PDX to BD9 are scheduled on a Monday (15 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip from Portland to Boulder?
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 April 28, 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.
Boarding
8.1
Crew
8.6
Overall
8.0
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Crew
8.6
Overall
8.0
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Crew
8.6
Overall
8.0
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Crew
8.6
Overall
8.0
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Crew
8.6
Overall
8.0
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Crew
8.6
Overall
8.0
Comfort
8.0
Entertainment
7.5
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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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Portland and Boulder flights
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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 April 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$154 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$254 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$98 | Average$198 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$140 | Average$259 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$145 | Average$361 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$147 | Average$303 | FlexibilityNo cancel fee | On-time63% |