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$93+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
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

Cheap 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 December 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:22 pmRDU - DEN
2 stops37h 33mMultiple Airlines
Mon 1/56:00 amDEN - RDU
1 stop11h 12mMultiple Airlines
Deal found 12/25$307
This Frontier deal was found by Cheapflights users on 12/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/288:04 pmRDU - DEN
1 stop14h 20mFrontier
Fri 1/301:21 pmDEN - RDU
Nonstop3h 23mFrontier
Deal found 12/26$315
This Frontier deal was found by Cheapflights users on 12/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:05 pmRDU - DEN
1 stop13h 51mFrontier
Wed 1/76:33 pmDEN - RDU
1 stop11h 20mFrontier
Deal found 12/26$353
This Frontier deal was found by Cheapflights users on 12/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/291:15 pmRDU - DEN
1 stop10h 53mFrontier
Wed 1/76:33 pmDEN - RDU
1 stop11h 20mFrontier
Deal found 12/26$383
This Expedia deal was found by Cheapflights users on 12/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/291:15 pmRDU - DEN
1 stop10h 53mFrontier
Fri 1/26:30 amDEN - RDU
1 stop6h 22mFrontier
Deal found 12/26$387
This Kiwi.com deal was found by Cheapflights users on 12/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:54 pmRDU - DEN
1 stop9h 29mFrontier
Wed 1/76:00 amDEN - RDU
2 stops11h 19mFrontier
Deal found 12/26$401
This Frontier deal was found by Cheapflights users on 12/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:07 pmRDU - DEN
1 stop12h 00mFrontier
Fri 1/212:14 amDEN - RDU
1 stop8h 01mFrontier
Deal found 12/26$407
This CheapOair deal was found by Cheapflights users on 12/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/283:47 pmRDU - DEN
1 stop9h 26mFrontier
Fri 1/26:30 amDEN - RDU
1 stop6h 22mFrontier
Deal found 12/26$408

Find flight deals from Raleigh to Boulder

Keep the following information in mind while searching for Raleigh to Boulder flight deals. Data was last updated December 28, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$124
(Frontier)

One-way from

$93
(Super.com)

Popular in

June

Cheapest in

January

Average price

$377
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 December 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 December 28, 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 4/3

1:00 pm-10:17 pm

1 stop11h 17m

Denver Intl

Tue 4/7

11:15 pm-12:05 pm

1 stop10h 50m

$221

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 1/22

5:30 pm-7:35 pm

Nonstop4h 05m

Denver Intl

Thu 2/12

6:40 pm-11:50 pm

Nonstop3h 10m

$237

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 1/29

8:03 am-10:13 am

Nonstop4h 10m

Denver Intl

Sun 2/1

5:51 pm-11:15 pm

Nonstop3h 24m

$248

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 2/6

8:03 am-10:13 am

Nonstop4h 10m

Denver Intl

Mon 2/9

5:51 pm-11:15 pm

Nonstop3h 24m

$277

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 5/8

6:00 am-3:30 pm

1 stop11h 30m

Denver Intl

Fri 5/15

11:08 pm-8:08 am

1 stop7h 00m

$305

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 5/14

6:00 am-3:30 pm

1 stop11h 30m

Denver Intl

Sun 5/17

11:08 pm-8:08 am

1 stop7h 00m

$306

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sun 1/25

4:07 pm-6:18 pm

Nonstop4h 11m

Denver Intl

Thu 1/29

9:44 am-3:05 pm

Nonstop3h 21m

$317

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Thu 1/15

5:40 am-12:10 pm

2 stops8h 30m

Denver Intl

Sun 1/18

9:10 am-5:50 pm

1 stop6h 40m

$322

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Fri 1/23

6:50 am-3:30 pm

2 stops10h 40m

Denver Intl

Sun 1/25

8:20 am-6:35 pm

1 stop8h 15m

$322

RaleighDenver

RDU - DEN

RDUDEN

Raleigh-Durham

Sat 5/9

5:48 pm-12:06 pm

1 stop20h 18m

Denver Intl

Tue 5/12

7:00 am-6:10 am

2 stops21h 10m

$348

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/26

Showing 1-10 of 22 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 December 26, 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, January is the cheapest month in which you can book a flight from Raleigh to Boulder (average of $89). Flying from Raleigh to Boulder in July is currently the most expensive (average of $175). 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 December 28, 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 42% 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 27, 2025.

Travelers seeking maximum savings on their Raleigh to Boulder flight should consider departing on Wednesday 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 December 28, 2025.

The most flights from RDU to BD9 are scheduled on a Saturday (6 on average). You will have fewer flight options on Wednesday, 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 December 28, 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
4,256 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,256 reviews
Southwest
8.0
Very good
4,256 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,019 reviews
Southwest
8.0
Very good
4,256 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,113 reviews
Southwest
8.0
Very good
4,256 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,072 reviews
Southwest
8.0
Very good
4,256 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,065 reviews
Southwest
8.0
Very good
4,256 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 6 different airlines.

  • How popular is this Raleigh to Boulder flight route?

    Flights from Raleigh-Durham to Boulder have been viewed 125 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 05m. JetBlue provides one of the quickest options available for as low as $237. 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 Frontier, with whom users have recently found tickets for as low as $60. However, be on the lookout for offers from American Airlines and Southwest, 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%), Frontier (73%) and Southwest (64%).

  • What are the cheapest flights from Raleigh to Boulder?

    The cheapest flight price from Raleigh to Boulder is $89. On average you can expect to pay $299. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $140.

  • 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, January is the cheapest month in which you can book a flight from Raleigh to Boulder (average of $89). Flying from Raleigh to Boulder in July is currently the most expensive (average of $175). 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 6 airlines flying from Raleigh to Boulder

Discover the top 6 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 December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$252FlexibilityNo cancel feeOn-time62%
DeltaCheapest$138Average$383FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$157Average$379FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$203Average$451FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$207Average$378FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$212Average$410FlexibilityNo cancel feeOn-time63%

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