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$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 2/20. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — DEN
janv. 26 — févr. 21
dim. 1/26
dim. 2/2
1 adult, Economy
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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 Wednesday

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 janvier 21, 2025.

Round-trip from

$66
(Cheapflightsfares)

One-way from

$48
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$138
From Portland to Boulder
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One-way flight from Portland to Boulder
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Highest demand for flights based on searches. 4% potential increase in price ($7 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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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 janvier 21, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 1/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 2/266:32 amPDX - DEN
Nonstop2h 41mFrontier
dim. 3/210:45 pmDEN - PDX
Nonstop2h 52mFrontier
Deal found 1/21$70
This Travelocity deal was found by Cheapflights users on 1/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 3/75:15 pmPDX - DEN
1 stop5h 34mMultiple Airlines
dim. 3/910:45 pmDEN - PDX
Nonstop2h 52mMultiple Airlines
Deal found 1/20$167
This Delta deal was found by Cheapflights users on 1/20. 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.
mer. 2/195:10 amPDX - DEN
1 stop5h 27mDelta
sam. 3/17:50 pmDEN - PDX
1 stop5h 08mDelta
Deal found 1/20$177
This Southwest deal was found by Cheapflights users on 1/21. 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.
mar. 2/117:20 amPDX - DEN
1 stop5h 15mSouthwest
mar. 2/114:30 pmDEN - PDX
1 stop6h 30mSouthwest
Deal found 1/21$211

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 janvier 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PortlandDenver

PDX - DEN

PDXDEN

Portland

mer. 6/18

6:20 am-9:57 am

Nonstop2h 37m

Denver Intl

mer. 6/25

7:20 am-9:12 am

Nonstop2h 52m

$66

PortlandDenver

PDX - DEN

PDXDEN

Portland

ven. 3/7

5:15 pm-11:49 pm

1 stop5h 34m

Denver Intl

dim. 3/9

10:45 pm-12:37 am

Nonstop2h 52m

$167

PortlandDenver

PDX - DEN

PDXDEN

Portland

mer. 2/19

5:15 pm-12:17 am

1 stop6h 02m

Denver Intl

mer. 2/26

7:50 pm-11:58 pm

1 stop5h 08m

$177

PortlandDenver

PDX - DEN

PDXDEN

Portland

mar. 2/11

7:20 am-1:35 pm

1 stop5h 15m

Denver Intl

mar. 2/11

4:30 pm-10:00 pm

1 stop6h 30m

$211

PortlandDenver

PDX - DEN

PDXDEN

Portland

lun. 3/31

1:45 pm-10:44 pm

1 stop7h 59m

Denver Intl

ven. 4/4

8:00 am-9:47 am

Nonstop2h 47m

$238

PortlandDenver

PDX - DEN

PDXDEN

Portland

jeu. 2/20

6:32 am-10:13 am

Nonstop2h 41m

$48

PortlandDenver

PDX - DEN

PDXDEN

Portland

mar. 2/25

5:15 pm-11:29 pm

1 stop5h 14m

$88

PortlandDenver

PDX - DEN

PDXDEN

Portland

mer. 2/19

5:20 pm-10:47 pm

1 stop4h 27m

$89

PortlandDenver

PDX - DEN

PDXDEN

Portland

lun. 4/21

7:10 pm-10:45 pm

Nonstop2h 35m

$99

PortlandDenver

PDX - DEN

PDXDEN

Portland

mar. 4/1

1:39 pm-10:44 pm

1 stop8h 05m

$104

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 12 results
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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 January 17, 2025.

To ensure you get the cheapest price possible for a flight from Portland to Boulder, you should look to book at least 83 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 $278). 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 janvier 21, 2025.

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 janvier 21, 2025.

The most flights from PDX to BD9 are scheduled on a Monday (17 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 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 janvier 21, 2025.
See what other customers who have flown with Frontier, United Airlines and Delta 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
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Entertainment

7.7

Boarding

8.2

Overall

8.1

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
4,662 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Entertainment

7.7

Boarding

8.2

Overall

8.1

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
9,706 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Entertainment

7.7

Boarding

8.2

Overall

8.1

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
8,521 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Entertainment

7.7

Boarding

8.2

Overall

8.1

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
8,985 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Entertainment

7.7

Boarding

8.2

Overall

8.1

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.

Sun Country Air
7.0
Good
386 reviews
Southwest
8.1
Very good
4,662 reviews

Comfort

8.1

Crew

8.7

Food

7.2

Entertainment

7.7

Boarding

8.2

Overall

8.1

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 10 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, 254 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 $89 one-way.

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

    Consider Frontier (91%), Lufthansa (89%) or United Airlines (87%) 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 $983, our data indicates the cheapest price to be $52. The most popular route (Portland - Denver Intl), is priced around $98.

  • 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 $278). 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

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Alternative routes for Portland to Boulder

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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 janvier 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$55Average$114FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$115Average$253FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$141Average$388FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$146Average$320FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$157Average$276FlexibilityNo cancel feeOn-time71%
DeltaCheapest$176Average$296FlexibilityNo cancel feeOn-timeN/A
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