$92+ 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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Mar 14 — Mar 211
1 adult, Economy
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Find cheap flights from Raleigh to Boulder with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Raleigh-Durham to Boulder are usually found in January or September, booked 59 days in advance, depart on a Thursday or Friday and return on a Thursday
Cheap flight deals from Raleigh to Boulder
Cheapest
Best
Last-minute
One-way
Cheapest flights from Raleigh to BoulderExplore 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 February 12, 2026.
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 February 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 4/215:55 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Tue 4/2111:59 pm
DEN
- RDU
1 stop8h 00m
Frontier
Deal found 2/9![Frontier logo]()
$118
This WAYA deal was found by Cheapflights users on 2/9. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/114:12 pm
RDU
- DEN
1 stop8h 52m
Frontier
Wed 3/1812:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/9![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Wed 5/65:55 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Fri 5/83:45 pm
DEN
- RDU
Nonstop3h 19m
Frontier
Deal found 2/11![Frontier logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Sun 4/269:47 pm
RDU
- DEN
1 stop17h 11m
Frontier
Sat 5/23:45 pm
DEN
- RDU
Nonstop3h 19m
Frontier
Deal found 2/10![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 2/12. 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.
Mon 5/119:59 pm
RDU
- DEN
Nonstop4h 10m
Frontier
Tue 5/191:09 pm
DEN
- RDU
1 stop9h 06m
Frontier
Deal found 2/12![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 4/73:57 pm
RDU
- DEN
1 stop9h 07m
Frontier
Tue 4/2111:40 am
DEN
- RDU
Nonstop3h 25m
Frontier
Deal found 2/10![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/206:43 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Wed 3/2512:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/11![Frontier logo]()
$128
This Frontier deal was found by Cheapflights users on 2/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:43 pm
RDU
- DEN
Nonstop4h 06m
Frontier
Thu 4/233:45 pm
DEN
- RDU
Nonstop3h 19m
Frontier
Deal found 2/10![Frontier logo]()
$129
This Orbitz deal was found by Cheapflights users on 2/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/269:59 pm
RDU
- DEN
Nonstop4h 10m
Frontier
Thu 4/309:06 pm
DEN
- RDU
1 stop21h 04m
Frontier
Deal found 2/11![Frontier logo]()
$130
This Super.com deal was found by Cheapflights users on 2/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/155:55 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Sun 4/193:45 pm
DEN
- RDU
Nonstop3h 19m
Frontier
Deal found 2/11![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 3/104:12 pm
RDU
- DEN
1 stop21h 57m
Frontier
Tue 3/1712:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/10![Frontier logo]()
$132
Best flights from Raleigh to BoulderDiscover carefully curated flight deals from Raleigh to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 12, 2026.
Discover carefully curated flight deals from Raleigh to Boulder that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 12, 2026.
This Frontier deal was found by Cheapflights users on 2/12. 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.
Sat 4/259:59 pm
RDU
- DEN
Nonstop4h 10m
Frontier
Thu 4/303:45 pm
DEN
- RDU
Nonstop3h 19m
Frontier
Deal found 2/12![Frontier logo]()
$133
This Southwest deal was found by Cheapflights users on 2/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/145:20 pm
RDU
- DEN
Nonstop3h 50m
Southwest
Tue 4/216:15 pm
DEN
- RDU
Nonstop3h 30m
Southwest
Deal found 2/10![Southwest logo]()
$177
This JetBlue deal was found by Cheapflights users on 2/9. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:00 pm
RDU
- DEN
1 stop10h 59m
JetBlue
Mon 4/611:15 pm
DEN
- RDU
1 stop10h 50m
JetBlue
Deal found 2/9![JetBlue logo]()
$221
This United Airlines deal was found by Cheapflights users on 2/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:00 am
RDU
- DEN
Nonstop4h 03m
United Airlines
Fri 4/245:50 pm
DEN
- RDU
Nonstop3h 29m
United Airlines
Deal found 2/11![United Airlines logo]()
$254
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:22 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Mon 3/238:00 am
DEN
- RDU
1 stop9h 51m
Frontier
Deal found 2/11![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Thu 3/126:43 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Mon 3/1611:59 pm
DEN
- RDU
1 stop8h 06m
Frontier
Deal found 2/11![Frontier logo]()
$197
This Southwest deal was found by Cheapflights users on 2/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/245:40 am
RDU
- DEN
Nonstop4h 00m
Southwest
Tue 3/316:10 pm
DEN
- RDU
Nonstop3h 10m
Southwest
Deal found 2/11![Southwest logo]()
$217
This Southwest deal was found by Cheapflights users on 2/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:40 am
RDU
- DEN
Nonstop3h 50m
Southwest
Sun 4/127:05 pm
DEN
- RDU
Nonstop3h 15m
Southwest
Deal found 2/9![Southwest logo]()
$257
This Expedia deal was found by Cheapflights users on 2/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2711:41 am
RDU
- DEN
1 stop10h 19m
Frontier
Sat 4/411:59 pm
DEN
- RDU
1 stop6h 47m
Frontier
Deal found 2/11![Frontier logo]()
$250
This Southwest deal was found by Cheapflights users on 2/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/55:00 am
RDU
- DEN
Nonstop3h 55m
Southwest
Sun 3/87:55 pm
DEN
- RDU
Nonstop3h 05m
Southwest
Deal found 2/10![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 2/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/135:00 am
RDU
- DEN
Nonstop3h 55m
Southwest
Mon 3/167:15 pm
DEN
- RDU
Nonstop3h 05m
Southwest
Deal found 2/9![Southwest logo]()
$277
This Southwest deal was found by Cheapflights users on 2/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/115:40 am
RDU
- DEN
Nonstop4h 00m
Southwest
Mon 3/167:15 pm
DEN
- RDU
Nonstop3h 05m
Southwest
Deal found 2/8![Southwest logo]()
$277
Last-minute flights from Raleigh to BoulderDiscover last-minute flight deals from Raleigh to Boulder. Data last updated February 12, 2026 and is based on user searches.
Discover last-minute flight deals from Raleigh to Boulder. Data last updated February 12, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 2/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:41 pm
RDU
- DEN
1 stop20h 50m
Frontier
Sat 3/712:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/11![Frontier logo]()
$140
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:25 am
RDU
- DEN
1 stop7h 31m
Frontier
Sat 3/712:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/11![Frontier logo]()
$129
This Expedia deal was found by Cheapflights users on 2/9. 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.
Wed 3/49:25 pm
RDU
- DEN
1 stop12h 30m
Frontier
Fri 3/612:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/9![Frontier logo]()
$138
This Super.com deal was found by Cheapflights users on 2/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:43 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Sat 3/712:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/10![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 3/104:12 pm
RDU
- DEN
1 stop21h 57m
Frontier
Tue 3/1712:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/10![Frontier logo]()
$132
This WAYA deal was found by Cheapflights users on 2/9. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/114:12 pm
RDU
- DEN
1 stop8h 52m
Frontier
Wed 3/1812:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/9![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 2/9. 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.
Thu 3/126:43 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Wed 3/1812:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/9![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/206:43 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Wed 3/2512:30 pm
DEN
- RDU
Nonstop3h 18m
Frontier
Deal found 2/11![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 3/262:26 pm
RDU
- DEN
1 stop9h 51m
Frontier
Wed 4/1511:40 am
DEN
- RDU
Nonstop3h 25m
Frontier
Deal found 2/10![Frontier logo]()
$133
One-way flights from Raleigh to BoulderSearch for one-way flight options from Raleigh to Boulder. Find affordable one-way fares based on user searches. Data last updated February 12, 2026.
Search for one-way flight options from Raleigh to Boulder. Find affordable one-way fares based on user searches. Data last updated February 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Tue 4/73:57 pm
RDU
- DEN
1 stop9h 07m
Frontier
Deal found 2/11![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 3/25:10 pm
RDU
- DEN
2 stops20h 04m
Frontier
Deal found 2/9![Frontier logo]()
$93
This Priceline deal was found by Cheapflights users on 2/12. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/135:55 pm
RDU
- DEN
Nonstop4h 12m
Frontier
Deal found 2/12![Frontier logo]()
$94
This Mytrip deal was found by Cheapflights users on 2/9. 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.
Thu 4/96:00 am
RDU
- DEN
1 stop8h 09m
Frontier
Deal found 2/9![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Mon 2/235:10 pm
RDU
- DEN
1 stop20h 46m
Frontier
Deal found 2/10![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 4/2010:38 pm
RDU
- DEN
2 stops15h 31m
Frontier
Deal found 2/11![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Tue 3/244:12 pm
RDU
- DEN
2 stops17h 01m
Frontier
Deal found 2/12![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Fri 5/86:50 pm
RDU
- DEN
2 stops19h 19m
Frontier
Deal found 2/12![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Mon 3/3012:06 pm
RDU
- DEN
1 stop30h 31m
Frontier
Deal found 2/10![Frontier logo]()
$100
This Booking.com deal was found by Cheapflights users on 2/9. 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 2/267:09 pm
RDU
- DEN
1 stop21h 53m
Frontier
Deal found 2/9![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Fri 3/67:06 pm
RDU
- DEN
1 stop13h 56m
Frontier
Deal found 2/9![Frontier logo]()
$102
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 February 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $118 (Kiwi.com) |
One-way from | $92 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $307 |
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 February 12, 2026.
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
Sat 4/25
9:59 pm-12:09 am
Nonstop4h 10m
Denver Intl
Thu 4/30
3:45 pm-9:04 pm
Nonstop3h 19m
$133
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Tue 4/14
5:20 pm-7:10 pm
Nonstop3h 50m
Denver Intl
Tue 4/21
6:15 pm-11:45 pm
Nonstop3h 30m
$177
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Mon 3/16
6:22 pm-8:34 pm
Nonstop4h 12m
Denver Intl
Mon 3/23
8:00 am-7:51 pm
1 stop9h 51m
$179
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Thu 3/12
6:43 pm-8:55 pm
Nonstop4h 12m
Denver Intl
Mon 3/16
11:59 pm-10:05 am
1 stop8h 06m
$197
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Tue 3/24
5:40 am-7:40 am
Nonstop4h 00m
Denver Intl
Tue 3/31
6:10 pm-11:20 pm
Nonstop3h 10m
$217
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Tue 3/31
2:00 pm-10:59 pm
1 stop10h 59m
Denver Intl
Mon 4/6
11:15 pm-12:05 pm
1 stop10h 50m
$221
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Fri 3/27
11:41 am-8:00 pm
1 stop10h 19m
Denver Intl
Sat 4/4
11:59 pm-8:46 am
1 stop6h 47m
$250
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Fri 4/24
8:00 am-10:03 am
Nonstop4h 03m
Denver Intl
Fri 4/24
5:50 pm-11:19 pm
Nonstop3h 29m
$254
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Wed 4/8
5:40 am-7:30 am
Nonstop3h 50m
Denver Intl
Sun 4/12
7:05 pm-12:20 am
Nonstop3h 15m
$257
RaleighDenver
RDU - DEN
RDUDEN
Raleigh-Durham
Thu 3/5
5:00 am-6:55 am
Nonstop3h 55m
Denver Intl
Sun 3/8
7:55 pm-1:00 am
Nonstop3h 05m
$257
Showing 1-10 of 23 results
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.
RDU-DEN
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
RDU-BD9
RDU-DEN
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 February 6, 2026.
To ensure you get the cheapest price possible for a flight from Raleigh to Boulder, you should look to book at least 59 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 $86). Flying from Raleigh to Boulder in June is currently the most expensive (average of $172). 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 February 12, 2026.
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 at noon could potentially save you up to 47% 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 February 7, 2026.
Travelers seeking maximum savings on their Raleigh to Boulder flight should consider departing on Thursday 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.
How much does it cost to fly round-trip from Raleigh to Boulder?
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 February 12, 2026.
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.
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
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Alternative routes for Raleigh to Boulder
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Complete your trip
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Search flights from Raleigh to Boulder by cabin class
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Raleigh and Boulder flights
Browse other Raleigh and Boulder flight options. Last updated on February 12, 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 February 12, 2026.
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Raleigh to Boulder flights
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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 February 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$99 | Average$242 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$357 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$157 | Average$335 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$180 | Average$436 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$207 | Average$372 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$212 | Average$415 | FlexibilityNo cancel fee | On-time63% |