$107+ Cheap flights from Portland (PDX) to Boulder, CO
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/13. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — DEN
Oct 17 — Oct 241
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 November, booked 77 days in advance, depart on a Thursday or Friday and return on a Saturday
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 September 17, 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 September 17, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 12/34:35 pm -
Nonstop2h 32m
Tue 12/81:40 pm -
Nonstop3h 00m
Deal found 9/13![Frontier logo]()
$144
This Frontier deal was found by Cheapflights users on 9/13. 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 10/811:06 am -
1 stop5h 55m
Tue 10/139:00 am -
Nonstop2h 54m
Deal found 9/13![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/1010:49 am -
Nonstop2h 43m
Tue 10/139:00 am -
Nonstop2h 54m
Deal found 9/15![Multiple Airlines logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 11/1212:02 pm -
Nonstop2h 33m
Tue 11/179:10 am -
Nonstop2h 57m
Deal found 9/14![Frontier logo]()
$187
This Expedia deal was found by Cheapflights users on 9/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am -
1 stop21h 39m
Sun 11/159:15 am -
Nonstop2h 57m
Deal found 9/12![Frontier logo]()
$189
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Thu 10/1511:49 am -
Nonstop2h 38m
Sun 10/189:00 am -
Nonstop2h 54m
Deal found 9/16![Frontier logo]()
$190
This Priceline deal was found by Cheapflights users on 9/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/512:02 pm -
Nonstop2h 33m
Sun 11/89:15 am -
Nonstop2h 57m
Deal found 9/15![Frontier logo]()
$193
This Priceline deal was found by Cheapflights users on 9/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:50 pm -
Nonstop2h 36m
Tue 11/179:10 am -
Nonstop2h 57m
Deal found 9/16![Multiple Airlines logo]()
$194
This Priceline deal was found by Cheapflights users on 9/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:03 pm -
Nonstop2h 33m
Tue 10/279:10 am -
Nonstop2h 57m
Deal found 9/14![Multiple Airlines logo]()
$195
This Priceline deal was found by Cheapflights users on 9/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:49 am -
Nonstop2h 38m
Thu 10/159:00 am -
Nonstop2h 54m
Deal found 9/14![Frontier logo]()
$197
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/2211:06 am -
1 stop5h 55m
Sun 10/259:00 am -
Nonstop2h 54m
Deal found 9/16![Frontier logo]()
$198
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 September 17, 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 September 17, 2026.
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 10/104:07 pm -
Nonstop2h 38m
Mon 10/127:25 pm -
Nonstop2h 45m
Deal found 9/15![United Airlines logo]()
$238
This Southwest deal was found by Cheapflights users on 9/14. 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 10/1311:35 pm -
1 stop7h 10m
Thu 10/156:35 pm -
1 stop6h 15m
Deal found 9/14![Southwest logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:03 pm -
Nonstop2h 33m
Sat 10/243:06 pm -
Nonstop2h 44m
Deal found 9/13![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/126:55 pm -
Nonstop2h 34m
Wed 10/146:00 am -
1 stop7h 05m
Deal found 9/16![United Airlines logo]()
$248
This Southwest deal was found by Cheapflights users on 9/15. 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 11/56:10 am -
1 stop8h 15m
Mon 11/97:15 pm -
2 stops7h 10m
Deal found 9/15![Southwest logo]()
$276
This Southwest deal was found by Cheapflights users on 9/13. 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 10/227:35 pm -
Nonstop2h 25m
Mon 10/268:55 pm -
Nonstop2h 50m
Deal found 9/13![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 11/1810:47 am -
Nonstop2h 40m
Mon 11/236:51 pm -
1 stop5h 07m
Deal found 9/13![Alaska Airlines logo]()
$327
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 10/319:00 am -
Nonstop2h 30m
Wed 11/411:29 am -
Nonstop2h 53m
Deal found 9/16![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 9/12. 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 10/285:45 am -
1 stop4h 50m
Fri 10/302:55 pm -
2 stops6h 40m
Deal found 9/12![Southwest logo]()
$288
This Southwest deal was found by Cheapflights users on 9/12. 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.
Mon 2/86:00 am -
2 stops7h 40m
Mon 3/86:30 pm -
2 stops6h 55m
Deal found 9/12![Southwest logo]()
$307
This Southwest deal was found by Cheapflights users on 9/15. 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 10/297:35 pm -
Nonstop2h 25m
Sun 11/18:30 am -
2 stops7h 30m
Deal found 9/15![Southwest logo]()
$319
Last-minute flights from Portland to BoulderDiscover last-minute flight deals from Portland to Boulder. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Boulder. Data last updated September 17, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 9/13. 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 9/2512:38 pm -
Nonstop2h 40m
Wed 10/710:49 pm -
1 stop13h 37m
Deal found 9/13![Frontier logo]()
$291
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 9/2512:38 pm -
Nonstop2h 40m
Sun 9/279:05 am -
1 stop26h 02m
Deal found 9/13![Frontier logo]()
$313
This Cheapflightsfares deal was found by Cheapflights users on 9/12. 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.
Fri 9/2512:38 pm -
Nonstop2h 40m
Mon 9/2810:00 am -
Nonstop2h 43m
Deal found 9/12![Frontier logo]()
$314
This Kissandfly.com deal was found by Cheapflights users on 9/12. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2512:38 pm -
Nonstop2h 40m
Mon 9/287:08 pm -
Nonstop2h 42m
Deal found 9/12![Multiple Airlines logo]()
$326
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2612:24 pm -
1 stop10h 20m
Tue 10/139:00 am -
Nonstop2h 54m
Deal found 9/15![Frontier logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/2712:38 pm -
Nonstop2h 40m
Tue 10/139:00 am -
Nonstop2h 54m
Deal found 9/15![Frontier logo]()
$303
This Frontier deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2712:38 pm -
Nonstop2h 40m
Wed 10/710:58 pm -
1 stop12h 13m
Deal found 9/13![Frontier logo]()
$317
This Frontier deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2712:24 pm -
1 stop10h 20m
Sat 10/1010:55 pm -
1 stop12h 16m
Deal found 9/14![Frontier logo]()
$319
This Frontier deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2712:38 pm -
Nonstop2h 40m
Sun 10/119:00 am -
Nonstop2h 54m
Deal found 9/13![Frontier logo]()
$322
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 September 17, 2026.
Search for one-way flight options from Portland to Boulder. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 12/134:35 pm -
Nonstop2h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$107
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 10/1911:06 am -
1 stop27h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 9/15. 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.
Fri 10/3012:31 pm -
1 stop10h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$112
This Southwest deal was found by Cheapflights users on 9/16. 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 10/283:50 pm -
Nonstop2h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Southwest logo]()
$113
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/1511:49 am -
Nonstop2h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$115
This Super.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2511:49 am -
Nonstop2h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$116
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Sun 11/1512:07 pm -
Nonstop2h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$117
This Southwest deal was found by Cheapflights users on 9/16. 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 10/215:45 am -
1 stop4h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Southwest logo]()
$119
This Cheapflightsfares deal was found by Cheapflights users on 9/12. 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 10/412:38 pm -
Nonstop2h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Frontier logo]()
$122
This Delta deal was found by Cheapflights users on 9/16. 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 10/75:49 pm -
1 stop5h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$123
This Super.com deal was found by Cheapflights users on 9/16. 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 11/611:06 am -
1 stop5h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$124
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 September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $144 (Cheapflightsfares) |
One-way from | $107 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $295 |
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 7,457,451 searches. Data last updated September 17, 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 Portland - DEN Denver Intl
PDXDEN
Portland
Wed 12/16
10:44 am-2:24 pm
Nonstop2h 40m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$113
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Wed 10/28
5:45 am-11:35 am
1 stop4h 50m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$118
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Fri 10/16
6:03 pm-9:36 pm
Nonstop2h 33m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$126
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Fri 12/11
10:44 am-2:24 pm
Nonstop2h 40m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$126
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Wed 10/28
11:03 am-4:59 pm
1 stop4h 56m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
Quickest round-trip
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Mon 10/19
7:35 pm-11:00 pm
Nonstop2h 25m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Tue 10/20
12:30 pm-9:25 pm
1 stop7h 55m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Sat 12/12
10:44 am-2:24 pm
Nonstop2h 40m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Mon 11/9
5:50 pm-9:26 pm
Nonstop2h 36m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
PortlandDenver
PDX Portland - DEN Denver Intl
PDXDEN
Portland
Sun 10/18
5:49 pm-11:55 pm
1 stop5h 06m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$170
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 September 17, 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 afternoon.
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 September 17, 2026.
The most flights from PDX to BD9 are scheduled on a Monday (18 on average). You will have fewer flight options on Saturday, 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?
Airfare is below average for this route at the moment.
Portland to Boulder flights typically cost between $227 and $358 in December.The cheapest round-trip price found within the last 5 days was $144 on Frontier (Dec 3-Dec 8).
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 September 12, 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 September 17, 2026.
Read through reviews of airlines operating flights from Portland to Boulder, such as Southwest,Alaska Airlines, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Boarding
8.1
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$55 | Average$197 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$258 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$126 | Average$256 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$141 | Average$283 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$147 | Average$363 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$150 | Average$321 | FlexibilityNo cancel fee | On-time69% |