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$99+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
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Cheapflights Tip: The best prices from Raleigh-Durham to Boulder are usually found in May or September, booked 84 days in advance, depart on a Thursday or Saturday and return on a Wednesday

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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$178
(CheapOair)

One-way from

$99
(United Airlines)

Popular in

December

Cheapest in

May

Average price

$347
Provider with most accurate pricing for Raleigh-Durham-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Raleigh-Durham-Denver Intl flights.
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From Raleigh-Durham to Boulder
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One-way flight from Raleigh-Durham to Boulder
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 26, 2025.

This CheapOair deal was found by Cheapflights users on 3/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/105:28 pmRDU - DEN
Nonstop4h 04mFrontier
Fri 5/1610:55 amDEN - RDU
Nonstop3h 33mFrontier
Deal found 3/25$178
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/104:15 pmRDU - DEN
Nonstop4h 05mUnited Airlines
Wed 5/145:55 pmDEN - RDU
Nonstop3h 21mUnited Airlines
Deal found 3/24$197
This American Airlines deal was found by Cheapflights users on 3/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:02 amRDU - DEN
1 stop8h 00mAmerican Airlines
Sat 5/106:15 amDEN - RDU
1 stop5h 45mAmerican Airlines
Deal found 3/26$217
This Mytrip deal was found by Cheapflights users on 3/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/165:24 pmRDU - DEN
Nonstop4h 11mMultiple Airlines
Sun 4/208:00 amDEN - RDU
1 stop8h 37mMultiple Airlines
Deal found 3/25$220
This Delta deal was found by Cheapflights users on 3/25. 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.
Sat 4/266:02 amRDU - DEN
1 stop6h 07mDelta
Sat 4/263:10 pmDEN - RDU
1 stop6h 42mDelta
Deal found 3/25$237
This JetBlue deal was found by Cheapflights users on 3/25. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/96:00 amRDU - DEN
1 stop9h 43mJetBlue
Tue 5/1311:59 pmDEN - RDU
1 stop7h 00mJetBlue
Deal found 3/25$245
This Southwest deal was found by Cheapflights users on 3/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/226:15 pmRDU - DEN
1 stop6h 50mSouthwest
Tue 4/2912:05 pmDEN - RDU
Nonstop3h 20mSouthwest
Deal found 3/24$247
This Sun Country Air deal was found by Cheapflights users on 3/25. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2112:27 pmRDU - DEN
1 stop8h 16mSun Country Air
Sun 11/236:17 pmDEN - RDU
1 stop14h 45mSun Country Air
Deal found 3/25$255
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/237:20 amRDU - DEN
2 stops15h 55mAlaska Airlines
Wed 4/302:39 pmDEN - RDU
1 stop13h 21mAlaska Airlines
Deal found 3/25$388

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 March 26, 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

Sat 5/10

5:28 pm-7:32 pm

Nonstop4h 04m

Denver Intl

Fri 5/16

10:55 am-4:28 pm

Nonstop3h 33m

$178

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sat 5/10

4:15 pm-6:20 pm

Nonstop4h 05m

Denver Intl

Wed 5/14

5:55 pm-11:16 pm

Nonstop3h 21m

$197

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Tue 5/6

5:02 am-11:02 am

1 stop8h 00m

Denver Intl

Sat 5/10

6:15 am-2:00 pm

1 stop5h 45m

$217

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 4/16

5:24 pm-7:35 pm

Nonstop4h 11m

Denver Intl

Sun 4/20

8:00 am-6:37 pm

1 stop8h 37m

$220

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sat 4/26

6:02 am-10:09 am

1 stop6h 07m

Denver Intl

Sat 4/26

3:10 pm-11:52 pm

1 stop6h 42m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 5/9

6:00 am-1:43 pm

1 stop9h 43m

Denver Intl

Tue 5/13

11:59 pm-8:59 am

1 stop7h 00m

$245

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 5/1

6:25 pm-10:27 am

1 stop18h 02m

Denver Intl

Sun 5/4

8:30 am-4:29 pm

1 stop5h 59m

$255

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 4/24

6:05 am-9:35 am

1 stop5h 30m

Denver Intl

Thu 5/1

11:35 pm-8:15 am

1 stop6h 40m

$257

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 4/23

7:20 am-9:15 pm

2 stops15h 55m

Denver Intl

Wed 4/30

2:39 pm-6:00 am

1 stop13h 21m

$388

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Tue 4/29

6:55 pm-8:45 pm

Nonstop3h 50m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Showing 1-10 of 19 results
1
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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 March 21, 2025.

To ensure you get the cheapest price possible for a flight from Raleigh to Boulder, you should look to book at least 84 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 March 26, 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. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 March 26, 2025.
See what other customers who have flown with Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Entertainment

7.6

Overall

8.1

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Entertainment

7.6

Overall

8.1

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,789 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Entertainment

7.6

Overall

8.1

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Entertainment

7.6

Overall

8.1

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Breeze Airways
8.0
Very good
156 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Entertainment

7.6

Overall

8.1

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Entertainment

7.6

Overall

8.1

Comfort

8.1

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 153 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 United Airlines, with whom users have recently found tickets for as low as $99. However, be on the lookout for offers from American Airlines and Sun Country Air, 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 Frontier (96%), United Airlines (88%) and Southwest (69%).

  • What are the cheapest flights from Raleigh to Boulder?

    The cheapest flight price from Raleigh to Boulder is $83. On average you can expect to pay $889. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $197.

  • 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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Sun Country AirCheapest$70Average$269FlexibilityNo cancel feeOn-time83%
FrontierCheapest$89Average$235FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$186Average$430FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$198Average$368FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$418FlexibilityNo cancel feeOn-time63%
DeltaCheapest$216Average$378FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$304Average$430FlexibilityNo cancel feeOn-time62%
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