How popular is this Raleigh to Boulder flight route?

Flights from Raleigh-Durham to Boulder have been viewed 87 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 Frontier, with whom users have recently found tickets for as low as $64. However, be on the lookout for offers from Delta and Southwest, as they are both options that can get you from Raleigh to Boulder for a low price.

Weekly flight availability from Raleigh to Boulder

The most flights from RDU to BD9 are scheduled on a Monday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

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.

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).

What are the cheapest flights from Raleigh to Boulder?

The cheapest flight price from Raleigh to Boulder is $113. On average you can expect to pay $744. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $153.

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 (95%), Southwest (81%) and Volaris (77%).

What are the most popular airlines that fly from Raleigh to Boulder?

Consider Frontier, United Airlines or Southwest when booking your flight. These represent the most popular airlines when flying from Raleigh to Boulder.

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 6 different airlines.

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.

Find Cheap Flights from Raleigh to Boulder

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Cheapflights Tip: The best prices from Raleigh-Durham to Boulder are usually found in January or February, booked 48 days in advance, depart on a Saturday or Thursday and return on a Friday

Find flight deals from Raleigh to Boulder

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Popular in	July
Cheapest in	January
Average price	$367

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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Highest demand for flights based on searches. 14% potential increase in price ($60 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).

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Average for round-trip flights in November 2026

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Cheapflights Insights

Everything you need to know about your flight from Raleigh to Boulder

Prices

Airlines

What is the cheapest time of day to fly from RDU to BD9?

One of the essential ways to save on airfare from Raleigh to Boulder is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 39% on airfare.

What is the cheapest day to fly from Raleigh to Boulder?

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

Reviews of airlines servicing Boulder

See what other customers who have flown with Southwest,Delta, andUnited 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

4,212 reviews

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

4,212 reviews

Southwest

8.0

Very good

4,212 reviews

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

7.8

Good

8,697 reviews

Southwest

8.0

Very good

4,212 reviews

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

7.3

Good

10,461 reviews

Southwest

8.0

Very good

4,212 reviews

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

7.0

Good

12,231 reviews

Southwest

8.0

Very good

4,212 reviews

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

5.5

Fair

2,511 reviews

Southwest

8.0

Very good

4,212 reviews

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

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 6 different airlines.
How popular is this Raleigh to Boulder flight route?
Flights from Raleigh-Durham to Boulder have been viewed 87 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 Frontier, with whom users have recently found tickets for as low as $64. However, be on the lookout for offers from Delta 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 (95%), Southwest (81%) and Volaris (77%).
What are the cheapest flights from Raleigh to Boulder?
The cheapest flight price from Raleigh to Boulder is $113. On average you can expect to pay $744. The most popular route, (Raleigh-Durham - Denver Intl), can usually be booked for $153.
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.

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Top 6 airlines flying from Raleigh to Boulder

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$98	Average$276	FlexibilityNo cancel fee	On-time62%
JetBlue	Cheapest$157	Average$398	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$219	Average$433	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$225	Average$487	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$226	Average$458	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$257	Average$491	FlexibilityNo cancel fee	On-time63%

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Cheap flights from Raleigh (RDU) to Boulder, CO

Find cheap flights from Raleigh to Boulder with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Raleigh to Boulder

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Popular in

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Cheapflights Insights

What is the cheapest time of day to fly from RDU to BD9?

One of the essential ways to save on airfare from Raleigh to Boulder is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 39% on airfare.

What is the cheapest day to fly from Raleigh to Boulder?

Travelers seeking maximum savings on their Raleigh to Boulder flight should consider departing on Tuesday 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

The most flights from RDU to BD9 are scheduled on a Monday (6 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

See what other customers who have flown with Southwest,Delta, andUnited 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.

Related info for your journey

What airport do you fly from for flights from Raleigh to Boulder?

How popular is this Raleigh to Boulder flight route?

What are the cheapest airlines to fly from Raleigh to Boulder one-way?

What are the most reliable airlines from Raleigh to Boulder?

What are the cheapest flights from Raleigh to Boulder?

Can I find deals for flights from Raleigh to Boulder that include hotel bookings?

How can I find direct flights from Raleigh to Boulder?

Can I find deals for business class flights from Raleigh to Boulder?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Raleigh to Boulder

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Complete your trip

Complete your trip to Boulder by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Raleigh to Boulder by cabin class

Find flights from Raleigh to Boulder, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Raleigh and Boulder flights

Browse other Raleigh and Boulder flight options. Last updated on November 4, 2026.

Other flights from Raleigh

Browse through other flights departing from Raleigh. Flights are based on user searches made on Cheapflights and were last updated on November 4, 2026.

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