HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Boulder

$48+ 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — DEN
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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.

The best prices from Portland to Boulder are usually found in September or January, booked 83 days in advance, depart on a Saturday or Thursday and return on a Saturday

Cheap flight deals from Portland to Boulder

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Boulder (BD9). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 18, 2024.

Round-trip from

$82
(Cheapflightsfares)

One-way from

$48
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$218
From Portland to Boulder
Search Deals
One-way flight from Portland to Boulder
Search Deals
High demand for flights, 4% potential price rise
Search Deals
Best time to find cheap flights, 2% potential price drop
Search Deals
Average for round-trip flights in December 2024
Search Deals

Find flight deals from Portland to Boulder

Cheapest flights from Portland to Boulder
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 December 18, 2024.

This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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 12/318:00 amPDX - DEN
1 stop4h 25mFrontier
Wed 1/11:43 pmDEN - PDX
Nonstop3h 01mFrontier
Deal found 12/17$150
This Mytrip deal was found by Cheapflights users on 12/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2211:59 pmPDX - DEN
1 stop10h 21mMultiple Airlines
Fri 1/31:43 pmDEN - PDX
Nonstop3h 01mMultiple Airlines
Deal found 12/16$297
This Delta deal was found by Cheapflights users on 12/18. 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 12/275:20 amPDX - DEN
1 stop4h 55mDelta
Tue 1/145:40 amDEN - PDX
1 stop7h 51mDelta
Deal found 12/18$442
This United deal was found by Cheapflights users on 12/17. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/271:34 pmPDX - DEN
1 stop8h 16mUnited Airlines
Tue 1/147:45 amDEN - PDX
1 stop5h 44mUnited Airlines
Deal found 12/17$446
This Alaska Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/303:31 pmPDX - DEN
1 stop7h 28mAlaska Airlines
Sat 1/117:00 amDEN - PDX
2 stops28h 02mAlaska Airlines
Deal found 12/17$474
This Southwest deal was found by Cheapflights users on 12/17. 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 12/295:15 amPDX - DEN
2 stops7h 00mSouthwest
Wed 1/19:00 amDEN - PDX
1 stop6h 20mSouthwest
Deal found 12/17$531
This American Airlines deal was found by Cheapflights users on 12/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/205:15 amPDX - DEN
1 stop5h 26mAmerican Airlines
Fri 12/203:31 pmDEN - PDX
1 stop8h 45mAmerican Airlines
Deal found 12/17$651

Find flights from Portland to Boulder within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortlandDenver

PDX - DEN

PDXDEN

Portland

Wed 2/12

6:32 am-10:13 am

Nonstop2h 41m

Denver Intl

Sun 2/16

10:45 pm-12:37 am

Nonstop2h 52m

$82

PortlandDenver

PDX - DEN

PDXDEN

Portland

Sat 1/25

5:30 pm-7:28 am

2 stops12h 58m

Denver Intl

Tue 1/28

10:15 pm-12:07 am

Nonstop2h 52m

$123

PortlandDenver

PDX - DEN

PDXDEN

Portland

Tue 1/7

5:00 am-8:32 am

Nonstop2h 32m

Denver Intl

Thu 1/9

8:00 am-9:54 am

Nonstop2h 54m

$139

PortlandDenver

PDX - DEN

PDXDEN

Portland

Wed 2/19

10:19 am-1:54 pm

Nonstop2h 35m

Denver Intl

Tue 2/25

7:00 am-10:54 am

1 stop4h 54m

$166

PortlandDenver

PDX - DEN

PDXDEN

Portland

Sat 2/1

10:16 am-3:20 pm

1 stop4h 04m

Denver Intl

Sat 2/8

7:50 pm-11:58 pm

1 stop5h 08m

$196

PortlandDenver

PDX - DEN

PDXDEN

Portland

Sat 2/15

6:35 am-4:35 pm

2 stops9h 00m

Denver Intl

Mon 2/17

7:50 am-9:40 am

Nonstop2h 50m

$242

PortlandDenver

PDX - DEN

PDXDEN

Portland

Thu 1/16

12:03 pm-3:37 pm

Nonstop2h 34m

$48

PortlandDenver

PDX - DEN

PDXDEN

Portland

Wed 1/22

3:00 pm-11:29 pm

1 stop7h 29m

$88

PortlandDenver

PDX - DEN

PDXDEN

Portland

Wed 1/15

5:15 pm-11:42 pm

1 stop5h 27m

$98

PortlandDenver

PDX - DEN

PDXDEN

Portland

Mon 4/14

6:59 pm-10:35 pm

Nonstop2h 36m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 14 results
1
2

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.
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.

Travel insights for flights from Portland to Boulder

Get recent, data-driven insights about flights from Portland to Boulder including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Portland to Boulder?

Use this chart to determine the optimal time to book a round-trip flight from Portland to Boulder. Price data was last updated on December 13, 2024.

To ensure you get the cheapest price possible for a flight from Portland to Boulder, you should look to book at least 30 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Portland to Boulder?

Currently, October is the cheapest month in which you can book a flight from Portland to Boulder (average of $197). Flying from Portland to Boulder in March is currently the most expensive (average of $271). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PDX to BD9?

Find hourly flight availability from Portland to Boulder. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2024.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portland to Boulder as you normally would.

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 2, 2024.

Travelers seeking maximum savings on their Portland to Boulder flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday afternoons 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 December 18, 2024.

The most flights from PDX to BD9 are scheduled on a Wednesday (15 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Boulder by month

Plan your trip to Boulder by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Boulder ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Boulder when rainfall is around 0.5 in.

Temperature in Boulder by month

Plan your trip to Boulder by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Boulder, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 December 18, 2024.
See what other customers who have flown with Delta, Frontier and United Airlines from Portland to Boulder have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,552 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,059 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.

  • What airport do you fly from for flights from Portland to Boulder?

    Most people fly from Portland (PDX) if they book a flight from Portland to Boulder. On average, Portland has 5 outbound flights to Boulder per day from 6 airlines. Portland is conveniently located just 6.0 mi from Portland’s city center.

  • How popular is this Portland to Boulder flight route?

    Within the past month, 249 users have taken a look at flights from Portland to Boulder.

  • What are the cheapest airlines to fly from Portland to Boulder one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $48. Alaska Airlines flights start at $88 while deals on Delta start at $98 one-way.

  • What are the most reliable airlines from Portland to Boulder?

    Consider United Airlines (93%), Lufthansa (93%) or Copa Airlines (92%) when booking your flight. These represent the most reliable airlines when flying from Portland to Boulder.

  • What are the cheapest flights from Portland to Boulder?

    Looking for the cheapest flight from Portland to Boulder? While on average our users pay $811, our data indicates the cheapest price to be $55. The most popular route (Portland - Denver Intl), is priced around $87.

  • Can I find deals for flights from Portland to Boulder that include hotel bookings?

    Yes. In addition to deals on Portland to Boulder flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Boulder?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Boulder.

  • Can I find deals for business class flights from Portland to Boulder?

    Yes. Cheapflights offers flight deals from Portland to Boulder by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland to Boulder?

    Currently, October is the cheapest month in which you can book a flight from Portland to Boulder (average of $197). Flying from Portland to Boulder in March is currently the most expensive (average of $271). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Boulder

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Denver flights
Redmond to Denver flights
Eugene to Denver flights
Boise to Denver flights
Medford to Denver flights
Portland to Grand Junction flights
Portland to Aspen flights
Portland to Colorado Springs flights
Portland to Montrose flights
Portland to Durango flights
Portland to Vail flights
Portland to Hayden flights
Boise to Colorado Springs flights
Medford to Durango flights
Redmond to Colorado Springs flights
Eugene to Colorado Springs flights
Redmond to Aspen flights
North Bend to Denver flights
Portland to Gunnison flights
Medford to Colorado Springs flights
Redmond to Durango flights
Yakima to Denver flights
Medford to Grand Junction flights
Boise to Montrose flights
Medford to Gunnison flights
Medford to Vail flights
Medford to Montrose flights
Medford to Hayden flights
Medford to Aspen flights
Eugene to Montrose flights
Eugene to Gunnison flights

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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$113FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$110Average$250FlexibilityNo cancel feeOn-time75%
DeltaCheapest$131Average$297FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$139Average$389FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$140Average$315FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$157Average$262FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.