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$112+ 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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Cheapflights Tip: The best prices from Raleigh-Durham to Boulder are usually found in January or September, booked 62 days in advance, depart on a Thursday or Friday and return on a Thursday

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 November 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:26 pmRDU - DEN
Nonstop4h 14mFrontier
Tue 12/1611:59 pmDEN - RDU
1 stop14h 45mFrontier
Deal found 11/12$143
This CheapOair deal was found by Cheapflights users on 11/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/213:47 pmRDU - DEN
1 stop9h 26mFrontier
Sat 12/278:45 pmDEN - RDU
1 stop10h 30mFrontier
Deal found 11/12$144
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:39 pmRDU - DEN
1 stop9h 44mFrontier
Wed 12/1011:59 pmDEN - RDU
1 stop8h 32mFrontier
Deal found 11/12$145
This CheapOair deal was found by Cheapflights users on 11/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:26 pmRDU - DEN
Nonstop4h 14mFrontier
Tue 12/236:00 amDEN - RDU
1 stop26h 12mFrontier
Deal found 11/13$146
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 12/65:45 amRDU - DEN
1 stop29h 17mFrontier
Tue 12/911:59 pmDEN - RDU
1 stop14h 45mFrontier
Deal found 11/11$147
This Kiwi.com deal was found by Cheapflights users on 11/11. 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.
Mon 11/2412:05 pmRDU - DEN
1 stop12h 54mFrontier
Fri 11/2811:07 amDEN - RDU
Nonstop3h 24mFrontier
Deal found 11/11$148
This Super.com deal was found by Cheapflights users on 11/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/76:26 pmRDU - DEN
Nonstop4h 14mFrontier
Wed 12/1011:59 pmDEN - RDU
1 stop8h 32mFrontier
Deal found 11/12$150
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:26 pmRDU - DEN
Nonstop4h 14mFrontier
Thu 12/117:00 amDEN - RDU
1 stop9h 21mFrontier
Deal found 11/10$152
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/65:39 pmRDU - DEN
1 stop9h 44mFrontier
Fri 12/126:00 amDEN - RDU
1 stop7h 45mFrontier
Deal found 11/10$153
This Frontier deal was found by Cheapflights users on 11/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:26 pmRDU - DEN
Nonstop4h 14mFrontier
Thu 12/181:21 pmDEN - RDU
Nonstop3h 20mFrontier
Deal found 11/12$154
This Super.com deal was found by Cheapflights users on 11/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:26 pmRDU - DEN
Nonstop4h 14mFrontier
Sun 12/712:11 pmDEN - RDU
Nonstop3h 20mFrontier
Deal found 11/12$155

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 November 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$141
(CheapOair)

One-way from

$112
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$317
Provider with most accurate pricing for Raleigh-Durham-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Raleigh-Durham-Denver Intl flights.
Search Deals
From Raleigh-Durham to Boulder
Search Deals
One-way flight from Raleigh-Durham to Boulder
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 13, 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

Fri 1/23

4:07 pm-6:18 pm

Nonstop4h 11m

Denver Intl

Fri 1/30

5:51 pm-11:15 pm

Nonstop3h 24m

$217

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 1/22

8:03 am-10:13 am

Nonstop4h 10m

Denver Intl

Mon 1/26

5:51 pm-11:15 pm

Nonstop3h 24m

$217

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 1/7

1:01 pm-5:26 pm

1 stop6h 25m

Denver Intl

Tue 1/13

7:05 am-2:01 pm

1 stop4h 56m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sat 2/7

6:49 pm-12:25 am

1 stop7h 36m

Denver Intl

Fri 2/13

12:59 am-11:08 am

1 stop8h 09m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Mon 1/19

9:59 am-1:37 pm

1 stop5h 38m

Denver Intl

Thu 1/22

12:30 am-8:52 am

1 stop6h 22m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sun 1/18

1:01 pm-5:26 pm

1 stop6h 25m

Denver Intl

Fri 1/23

12:30 am-8:54 am

1 stop6h 24m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sat 1/10

6:15 pm-11:01 pm

1 stop6h 46m

Denver Intl

Tue 1/20

2:42 pm-12:18 am

1 stop7h 36m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Tue 1/20

1:13 pm-5:28 pm

1 stop6h 15m

Denver Intl

Sat 1/24

6:00 am-1:51 pm

1 stop5h 51m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 1/28

9:59 am-1:37 pm

1 stop5h 38m

Denver Intl

Tue 2/3

4:43 pm-12:18 am

1 stop5h 35m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sun 1/18

6:00 am-10:33 am

1 stop6h 33m

Denver Intl

Thu 1/22

12:30 am-8:52 am

1 stop6h 22m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 21 results
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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 November 7, 2025.

To ensure you get the cheapest price possible for a flight from Raleigh to Boulder, you should look to book at least 62 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, February is the cheapest month in which you can book a flight from Raleigh to Boulder (average of $90). Flying from Raleigh to Boulder in July is currently the most expensive (average of $176). 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 November 13, 2025.

One of the essential ways to save on airfare from Raleigh to Boulder is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 35% on airfare.

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 December 16, 2024.

Travelers seeking maximum savings on their Raleigh to Boulder flight should consider departing on Monday afternoons 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 November 13, 2025.

The most flights from RDU to BD9 are scheduled on a Thursday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

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 November 13, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Raleigh 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
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
8,007 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
9,017 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,051 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,109 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 5 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 117 times in the past calendar month.

  • How long is the flight from Raleigh to Boulder?

    A quick flight from Raleigh to Boulder can take about 4h 11m. United Airlines provides one of the quickest options available for as low as $217. Raleigh and Boulder are separated by a distance of 1432 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 (93%), Southwest (79%) and Frontier (65%).

  • What are the cheapest flights from Raleigh to Boulder?

    The cheapest flight price from Raleigh to Boulder is $101. On average you can expect to pay $1,017. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $127.

  • 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, February is the cheapest month in which you can book a flight from Raleigh to Boulder (average of $90). Flying from Raleigh to Boulder in July is currently the most expensive (average of $176). 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$252FlexibilityNo cancel feeOn-time62%
DeltaCheapest$138Average$387FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$200Average$379FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$201Average$471FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$205Average$410FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$244Average$394FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$255Average$310FlexibilityNo cancel feeOn-time83%

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