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$117+ Cheap flights from Raleigh (RDU) 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Raleigh-Durham to Boulder are usually found in September or October, booked 63 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from Raleigh to Boulder

Keep the following information in mind while searching for Raleigh to Boulder flight deals. Data was last updated June 12, 2025.

Round-trip from

$180
(FlightHub)

One-way from

$117
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$357
From Raleigh-Durham to Boulder
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One-way flight from Raleigh-Durham to Boulder
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Raleigh to Boulder

Cheapest flights from Raleigh to Boulder
Explore the most affordable flight options available from Raleigh to Boulder. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/97:56 pmRDU - DEN
1 stop19h 01mFrontier
Fri 7/1111:05 amDEN - RDU
Nonstop3h 33mFrontier
Deal found 6/9$180
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/235:20 pmRDU - DEN
1 stop7h 34mAmerican Airlines
Wed 7/2311:55 pmDEN - RDU
1 stop7h 32mAmerican Airlines
Deal found 6/12$211
This Delta deal was found by Cheapflights users on 6/10. 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 7/236:35 pmRDU - DEN
1 stop6h 31mDelta
Tue 7/296:30 amDEN - RDU
1 stop6h 16mDelta
Deal found 6/10$237
This Southwest deal was found by Cheapflights users on 6/9. 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 7/276:35 amRDU - DEN
Nonstop3h 40mSouthwest
Sat 8/26:15 pmDEN - RDU
Nonstop3h 20mSouthwest
Deal found 6/9$267
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/244:28 pmRDU - DEN
Nonstop3h 50mUnited Airlines
Mon 9/295:21 pmDEN - RDU
Nonstop3h 24mUnited Airlines
Deal found 6/10$291
This Mytrip deal was found by Cheapflights users on 6/10. 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.
Fri 7/49:20 amRDU - DEN
2 stops23h 56mMultiple Airlines
Thu 7/106:00 amDEN - RDU
1 stop9h 05mMultiple Airlines
Deal found 6/10$323

Cheapflights Fare Finder

Customize your flight search to find flights from Raleigh 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 June 12, 2025.
Use the filters below to find and compare flights from Raleigh to Boulder that are best for you.

Fly from

Raleigh

Fly to

Boulder

Route

Depart

Return

Price

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 7/9

7:56 pm-12:57 pm

1 stop19h 01m

Denver Intl

Fri 7/11

11:05 am-4:38 pm

Nonstop3h 33m

$180

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 7/23

5:20 pm-10:54 pm

1 stop7h 34m

Denver Intl

Wed 7/23

11:55 pm-9:27 am

1 stop7h 32m

$211

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 7/23

6:00 am-12:47 pm

1 stop8h 47m

Denver Intl

Mon 8/4

12:55 am-8:44 am

1 stop5h 49m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sun 7/27

6:35 am-8:15 am

Nonstop3h 40m

Denver Intl

Sat 8/2

6:15 pm-11:35 pm

Nonstop3h 20m

$267

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sun 7/27

7:00 am-8:51 am

Nonstop3h 51m

Denver Intl

Mon 7/28

11:50 pm-5:15 am

Nonstop3h 25m

$317

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 7/4

9:20 am-7:16 am

2 stops23h 56m

Denver Intl

Thu 7/10

6:00 am-5:05 pm

1 stop9h 05m

$323

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Mon 8/18

9:10 am-3:21 pm

1 stop8h 11m

$117

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 7/11

6:11 pm-8:56 pm

1 stop28h 45m

$118

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Mon 7/14

4:30 pm-6:16 pm

Nonstop3h 46m

$119

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sun 7/27

8:15 pm-12:20 am

1 stop6h 05m

$129

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 14 results
1
2

Best time to book a flight from Raleigh to Boulder

Have a flexible travel schedule? Discover the best time to fly to Boulder from Raleigh 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.

Cheapflights Insights

Everything you need to know about your flight from Raleigh to Boulder

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

Use this chart to determine the optimal time to book a round-trip flight from Raleigh to Boulder. Price data was last updated on June 9, 2025.

To ensure you get the cheapest price possible for a flight from Raleigh to Boulder, you should look to book at least 63 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 Raleigh to Boulder?

Currently, October is the cheapest month in which you can book a flight from Raleigh to Boulder (average of $197). Flying from Raleigh 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 RDU to BD9?

Find hourly flight availability from Raleigh 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 June 12, 2025.

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

What is the cheapest day to fly from Raleigh to Boulder?

Use this chart to determine the cheapest time to fly round-trip from Raleigh to Boulder. Price data was last updated on June 30, 2024.

Travelers seeking maximum savings on their Raleigh to Boulder flight should consider departing on Friday at noon when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Raleigh to Boulder

Explore weekly flight availability from Raleigh 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 June 12, 2025.

The most flights from RDU to BD9 are scheduled on a Monday (6 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 June 12, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Raleigh to Boulder have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
JetBlue
7.3
Good
2,925 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Entertainment

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Raleigh 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 Raleigh to Boulder?

    Located just 11.1 mi from the city center, Raleigh-Durham is the airport most travelers will use when flying to Boulder from Raleigh. Booking flights from Raleigh-Durham (RDU) to Boulder should be relatively easy as there are 4 daily outbound flights to Boulder from 7 different airlines.

  • How popular is this Raleigh to Boulder flight route?

    Flights from Raleigh-Durham to Boulder have been viewed 130 times in the past calendar month.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $117. However, be on the lookout for offers from Sun Country Air and United Airlines, as they are both options that can get you from Raleigh to Boulder for a low price.

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

    The top 3 most reliable airlines when flying from Raleigh to Boulder are United Airlines (84%), Southwest (66%) and Frontier (56%).

  • What are the cheapest flights from Raleigh to Boulder?

    The cheapest flight price from Raleigh to Boulder is $102. On average you can expect to pay $702. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $185.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Raleigh 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 Raleigh to Boulder?

    Currently, October is the cheapest month in which you can book a flight from Raleigh to Boulder (average of $197). Flying from Raleigh 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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Top 7 airlines flying from Raleigh to Boulder

Discover the top 7 airlines that operate flights from Raleigh 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$93Average$244FlexibilityNo cancel feeOn-time62%
DeltaCheapest$149Average$364FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$190Average$424FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$198Average$357FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$209Average$415FlexibilityNo cancel feeOn-time63%
Sun Country AirCheapest$220Average$310FlexibilityNo cancel feeOn-time83%
JetBlueCheapest$244Average$394FlexibilityNo cancel feeOn-time62%

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