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$109+ 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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Oct 25 — Nov 11
Sat 10/25
Sat 11/1
1 adult, Economy
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Cheapflights Tip: The best prices from Raleigh-Durham to Boulder are usually found in January or November, booked 62 days in advance, depart on a Thursday or Friday 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 September 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$149
(Booking.com)

One-way from

$109
(Southwest)

Popular in

December

Cheapest in

January

Average price

$277
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
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High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 25, 2025.

This Booking.com deal was found by Cheapflights users on 9/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2310:35 amRDU - DEN
1 stop22h 39mFrontier
Sun 10/267:00 amDEN - RDU
1 stop28h 32mFrontier
Deal found 9/23$149
This Frontier deal was found by Cheapflights users on 9/23. 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.
Mon 10/271:05 pmRDU - DEN
1 stop13h 46mFrontier
Sun 11/27:08 amDEN - RDU
1 stop12h 03mFrontier
Deal found 9/23$153
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 10/255:59 pmRDU - DEN
Nonstop4h 05mFrontier
Mon 11/38:28 amDEN - RDU
1 stop13h 27mFrontier
Deal found 9/23$154
This Priceline deal was found by Cheapflights users on 9/22. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:30 amRDU - DEN
1 stop8h 14mFrontier
Fri 10/246:00 amDEN - RDU
1 stop9h 47mFrontier
Deal found 9/22$155
This Frontier deal was found by Cheapflights users on 9/23. 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.
Tue 10/285:34 pmRDU - DEN
1 stop7h 42mFrontier
Fri 10/317:08 amDEN - RDU
1 stop12h 03mFrontier
Deal found 9/23$156
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 10/255:59 pmRDU - DEN
Nonstop4h 05mFrontier
Sun 11/211:15 pmDEN - RDU
1 stop6h 21mFrontier
Deal found 9/23$157
This Frontier deal was found by Cheapflights users on 9/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/319:38 amRDU - DEN
1 stop10h 52mFrontier
Mon 11/311:18 amDEN - RDU
1 stop7h 31mFrontier
Deal found 9/24$158
This Cheapflightsfares deal was found by Cheapflights users on 9/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/295:34 pmRDU - DEN
1 stop7h 42mFrontier
Sun 11/211:15 pmDEN - RDU
1 stop6h 21mFrontier
Deal found 9/25$159
This Frontier deal was found by Cheapflights users on 9/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:00 amRDU - DEN
1 stop10h 10mFrontier
Mon 11/102:56 pmDEN - RDU
1 stop6h 59mFrontier
Deal found 9/24$160
This Booking.com deal was found by Cheapflights users on 9/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/19:09 amRDU - DEN
1 stop26h 34mFrontier
Sun 11/212:34 amDEN - RDU
1 stop12h 32mFrontier
Deal found 9/23$161
This Booking.com deal was found by Cheapflights users on 9/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/29:02 pmRDU - DEN
1 stop28h 11mFrontier
Sat 10/46:59 pmDEN - RDU
1 stop14h 27mFrontier
Deal found 9/24$162

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 September 25, 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 10/24

6:15 pm-8:05 pm

Nonstop3h 50m

Denver Intl

Thu 10/30

6:30 pm-11:40 pm

Nonstop3h 10m

$217

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 10/30

7:25 am-9:15 am

Nonstop3h 50m

Denver Intl

Thu 11/6

6:45 pm-11:55 pm

Nonstop3h 10m

$217

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 10/30

7:25 am-9:15 am

Nonstop3h 50m

Denver Intl

Sat 11/1

11:00 am-4:10 pm

Nonstop3h 10m

$257

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 12/5

5:10 pm-11:04 pm

1 stop7h 54m

Denver Intl

Sun 12/7

11:59 pm-9:42 am

1 stop7h 43m

$259

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Wed 10/15

1:27 pm-8:58 pm

1 stop9h 31m

Denver Intl

Sun 10/19

12:50 am-8:48 am

1 stop5h 58m

$277

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 10/31

10:15 am-3:10 pm

1 stop6h 55m

Denver Intl

Sat 11/1

6:00 am-3:45 pm

2 stops7h 45m

$302

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 12/12

7:10 am-9:05 am

Nonstop3h 55m

Denver Intl

Tue 12/16

4:55 pm-10:05 pm

Nonstop3h 10m

$307

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 10/17

7:59 pm-11:59 pm

1 stop6h 00m

Denver Intl

Tue 10/21

6:05 am-1:59 pm

1 stop5h 54m

$318

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 10/31

8:00 am-10:04 am

Nonstop4h 04m

Denver Intl

Sat 11/1

5:25 pm-10:42 pm

Nonstop3h 17m

$337

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 11/6

6:50 am-1:10 pm

2 stops8h 20m

Denver Intl

Mon 11/10

7:50 am-4:00 pm

2 stops6h 10m

$347

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/23

Showing 1-10 of 22 results
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2
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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 September 19, 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, 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 September 25, 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 December 16, 2024.

Travelers seeking maximum savings on their Raleigh to Boulder flight should consider departing on Wednesday evenings 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.

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 September 25, 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 (1 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 September 25, 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
4,246 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
8.0
Very good
7,973 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
8,926 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
3,162 reviews
Southwest
8.0
Very good
4,246 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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 3 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 126 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 3h 50m. Southwest 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 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 $109. However, be on the lookout for offers from American Airlines and Frontier, 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 (88%), Southwest (63%) and Frontier (44%).

  • What are the cheapest flights from Raleigh to Boulder?

    The cheapest flight price from Raleigh to Boulder is $87. On average you can expect to pay $285. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $147.

  • 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 September 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$105Average$248FlexibilityNo cancel feeOn-time62%
DeltaCheapest$138Average$388FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$190Average$469FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$198Average$370FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$410FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$244Average$394FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$255Average$310FlexibilityNo cancel feeOn-time83%

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