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$94+ 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 9/27. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
ag. 19 — ag. 261
dt. 8/19
dt. 8/26
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 63 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 agost 14, 2025.

Round-trip from

$162
(Priceline)

One-way from

$94
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$303
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 August 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 agost 14, 2025.

This Mytrip deal was found by Cheapflights users on 8/14. 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.
ds. 9/276:06 pmRDU - DEN
1 stop27h 58mFrontier
dg. 9/2812:04 amDEN - RDU
1 stop7h 49mFrontier
Deal found 8/14$162
This Booking.com deal was found by Cheapflights users on 8/14. 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.
ds. 9/136:06 pmRDU - DEN
1 stop16h 30mFrontier
dv. 9/1912:04 amDEN - RDU
1 stop7h 49mFrontier
Deal found 8/14$163
This Mytrip deal was found by Cheapflights users on 8/14. 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.
dc. 10/86:30 amRDU - DEN
1 stop18h 46mFrontier
dt. 10/1412:36 amDEN - RDU
1 stop8h 54mFrontier
Deal found 8/14$164
This Mytrip deal was found by Cheapflights users on 8/14. 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.
dg. 8/2412:09 pmRDU - DEN
1 stop21h 03mFrontier
dj. 8/287:00 amDEN - RDU
1 stop11h 30mFrontier
Deal found 8/14$165
This Booking.com deal was found by Cheapflights users on 8/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dc. 9/37:00 pmRDU - DEN
1 stop15h 09mFrontier
ds. 9/612:04 amDEN - RDU
1 stop7h 49mFrontier
Deal found 8/13$166
This Frontier deal was found by Cheapflights users on 8/14. 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.
dj. 10/169:44 pmRDU - DEN
1 stop12h 47mFrontier
ds. 10/1812:36 amDEN - RDU
1 stop7h 09mFrontier
Deal found 8/14$167
This Kiwi.com deal was found by Cheapflights users on 8/14. 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.
dv. 8/2211:52 amRDU - DEN
1 stop11h 43mFrontier
dg. 8/2411:59 pmDEN - RDU
1 stop12h 18mFrontier
Deal found 8/14$168
This CheapOair deal was found by Cheapflights users on 8/14. 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.
dv. 9/196:06 pmRDU - DEN
1 stop6h 47mFrontier
dc. 9/2412:59 amDEN - RDU
1 stop14h 39mFrontier
Deal found 8/14$169
This CheapOair deal was found by Cheapflights users on 8/14. 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.
dv. 9/125:23 pmRDU - DEN
Nonstop3h 55mFrontier
dt. 9/168:00 amDEN - RDU
2 stops34h 37mFrontier
Deal found 8/14$171
This FlightHub deal was found by Cheapflights users on 8/14. 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.
dj. 9/189:55 pmRDU - DEN
1 stop12h 41mFrontier
dt. 9/234:44 pmDEN - RDU
1 stop25h 53mFrontier
Deal found 8/14$172
This CheapOair deal was found by Cheapflights users on 8/13. 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.
ds. 8/235:27 pmRDU - DEN
Nonstop3h 54mFrontier
dg. 8/2412:54 amDEN - RDU
1 stop15h 29mFrontier
Deal found 8/13$173

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 agost 14, 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

dv. 10/17

5:39 pm-7:44 pm

Nonstop4h 05m

Denver Intl

dg. 10/19

12:59 am-1:21 pm

2 stops10h 22m

$165

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dj. 11/13

4:23 pm-9:49 pm

1 stop7h 26m

Denver Intl

dg. 11/16

12:34 am-3:01 pm

1 stop12h 27m

$165

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dj. 9/4

6:06 pm-10:53 pm

1 stop6h 47m

Denver Intl

dg. 9/7

12:04 am-9:53 am

1 stop7h 49m

$166

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

ds. 9/6

6:45 am-7:02 pm

1 stop14h 17m

Denver Intl

dc. 9/10

7:48 pm-11:31 am

1 stop13h 43m

$166

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dj. 11/6

4:23 pm-9:49 pm

1 stop7h 26m

Denver Intl

ds. 11/8

12:04 am-9:52 am

1 stop7h 48m

$166

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dv. 11/14

11:43 am-5:42 pm

1 stop7h 59m

Denver Intl

dg. 11/16

12:34 am-3:06 pm

1 stop12h 32m

$166

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dt. 9/9

6:45 am-9:06 am

1 stop28h 21m

Denver Intl

ds. 9/13

5:45 pm-9:00 pm

1 stop25h 15m

$166

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

ds. 9/20

3:15 pm-9:10 pm

1 stop7h 55m

Denver Intl

ds. 9/27

10:25 am-3:45 pm

Nonstop3h 20m

$167

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dv. 10/3

10:48 am-9:01 am

1 stop24h 13m

Denver Intl

dc. 10/8

8:03 pm-8:41 pm

1 stop22h 38m

$168

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

dl. 9/22

6:06 pm-10:53 pm

1 stop6h 47m

Denver Intl

dc. 9/24

7:48 pm-11:31 am

1 stop13h 43m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 23 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 August 8, 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 agost 14, 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 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.

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 agost 14, 2025.

The most flights from RDU to BD9 are scheduled on a Thursday (8 on average). You will have fewer flight options on Tuesday, 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 agost 14, 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
4,244 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,219 reviews
Southwest
8.0
Very good
4,244 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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 124 times in the past calendar month.

  • 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 (87%), Southwest (56%) and Frontier (45%).

  • What are the cheapest flights from Raleigh to Boulder?

    The cheapest flight price from Raleigh to Boulder is $97. On average you can expect to pay $830. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $161.

  • 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 agost 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$103Average$251FlexibilityNo cancel feeOn-time62%
DeltaCheapest$138Average$372FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$197Average$462FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$198Average$408FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$198Average$370FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$244Average$394FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$255Average$310FlexibilityNo cancel feeOn-time83%

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