$109+ Cheap flights from Raleigh (RDU) to Boulder, CO
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Oct 19 — Oct 261
Round-trip
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 February, booked 48 days in advance, depart on a Thursday or Saturday and return on a Friday
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 September 19, 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 September 19, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/216:30 am -
2 stops11h 24m
Wed 10/2810:43 am -
1 stop11h 14m
Deal found 9/16![Frontier logo]()
$194
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Fri 10/231:16 pm -
1 stop20h 50m
Wed 10/2810:43 am -
1 stop23h 41m
Deal found 9/16![Frontier logo]()
$196
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Sat 10/101:40 pm -
1 stop10h 09m
Mon 10/191:18 pm -
Nonstop3h 24m
Deal found 9/18![Frontier logo]()
$197
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Fri 10/167:37 pm -
Nonstop4h 06m
Tue 10/2010:40 am -
1 stop26h 25m
Deal found 9/18![Frontier logo]()
$198
This deal was found by Cheapflights users on 9/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/174:49 pm -
1 stop7h 19m
Sat 9/196:40 am -
1 stop7h 51m
Deal found 9/16![Frontier logo]()
$199
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Tue 10/135:26 pm -
1 stop16h 41m
Wed 10/2110:38 am -
1 stop7h 57m
Deal found 9/18![Frontier logo]()
$200
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Mon 10/125:26 pm -
1 stop8h 52m
Sat 10/1710:58 am -
Nonstop3h 26m
Deal found 9/18![Frontier logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/134:20 pm -
1 stop17h 46m
Tue 10/206:57 pm -
1 stop18h 24m
Deal found 9/17![Frontier logo]()
$202
This Mytrip deal was found by Cheapflights users on 9/16. 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.
Tue 10/206:30 am -
2 stops11h 24m
Tue 10/276:10 am -
2 stops14h 39m
Deal found 9/16![Frontier logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/206:30 am -
2 stops13h 04m
Wed 10/2810:43 am -
1 stop11h 14m
Deal found 9/17![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/175:26 pm -
1 stop8h 52m
Wed 10/2810:48 am -
1 stop7h 47m
Deal found 9/18![Frontier logo]()
$205
This FlightHub deal was found by Cheapflights users on 9/16. 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.
Sat 10/101:40 pm -
1 stop10h 09m
Sat 10/1710:38 am -
1 stop7h 57m
Deal found 9/16![Frontier logo]()
$206
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 September 19, 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 September 19, 2026.
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:21 pm -
1 stop6h 23m
Wed 10/2112:59 am -
1 stop5h 46m
Deal found 9/17![Delta logo]()
$286
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:15 am -
Nonstop3h 50m
Wed 10/219:54 am -
Nonstop3h 27m
Deal found 9/14![United Airlines logo]()
$351
This Southwest deal was found by Cheapflights users on 9/15. 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 10/275:40 pm -
Nonstop3h 50m
Tue 11/310:50 am -
Nonstop3h 10m
Deal found 9/15![Southwest logo]()
$351
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/75:10 pm -
2 stops27h 16m
Mon 12/141:54 pm -
1 stop25h 36m
Deal found 9/14![Alaska Airlines logo]()
$538
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Thu 10/228:15 am -
Nonstop3h 50m
Tue 10/279:51 am -
Nonstop3h 20m
Deal found 9/17![United Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 9/15. 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 10/225:50 pm -
2 stops8h 00m
Mon 10/261:45 pm -
2 stops7h 55m
Deal found 9/15![Southwest logo]()
$437
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/24:27 pm -
Nonstop3h 52m
Tue 10/69:54 am -
Nonstop3h 27m
Deal found 9/17![United Airlines logo]()
$481
This Southwest deal was found by Cheapflights users on 9/15. 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 12/318:05 am -
2 stops7h 40m
Wed 1/66:00 am -
1 stop7h 30m
Deal found 9/15![Southwest logo]()
$484
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/155:10 pm -
2 stops23h 14m
Sat 12/199:42 pm -
2 stops18h 02m
Deal found 9/15![Alaska Airlines logo]()
$599
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/234:27 pm -
Nonstop3h 52m
Mon 10/264:18 pm -
Nonstop3h 17m
Deal found 9/14![United Airlines logo]()
$522
This Southwest deal was found by Cheapflights users on 9/18. 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 10/166:15 pm -
Nonstop3h 50m
Sun 10/187:35 pm -
Nonstop3h 20m
Deal found 9/18![Southwest logo]()
$583
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 10/284:17 pm -
Nonstop4h 05m
Sun 11/19:51 am -
Nonstop3h 20m
Deal found 9/16![United Airlines logo]()
$557
Last-minute flights from Raleigh to BoulderDiscover last-minute flight deals from Raleigh to Boulder. Data last updated September 19, 2026 and is based on user searches.
Discover last-minute flight deals from Raleigh to Boulder. Data last updated September 19, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Sat 10/101:40 pm -
1 stop10h 09m
Mon 10/191:18 pm -
Nonstop3h 24m
Deal found 9/18![Frontier logo]()
$197
This FlightHub deal was found by Cheapflights users on 9/16. 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.
Sat 10/101:40 pm -
1 stop10h 09m
Sat 10/1710:38 am -
1 stop7h 57m
Deal found 9/16![Frontier logo]()
$206
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Mon 10/125:26 pm -
1 stop8h 52m
Sat 10/1710:58 am -
Nonstop3h 26m
Deal found 9/18![Frontier logo]()
$201
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Tue 10/135:26 pm -
1 stop16h 41m
Wed 10/2110:38 am -
1 stop7h 57m
Deal found 9/18![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/134:20 pm -
1 stop17h 46m
Tue 10/206:57 pm -
1 stop18h 24m
Deal found 9/17![Frontier logo]()
$202
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Fri 10/167:37 pm -
Nonstop4h 06m
Tue 10/2010:40 am -
1 stop26h 25m
Deal found 9/18![Frontier logo]()
$198
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/175:26 pm -
1 stop8h 52m
Wed 10/2810:48 am -
1 stop7h 47m
Deal found 9/18![Frontier logo]()
$205
This Mytrip deal was found by Cheapflights users on 9/16. 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.
Tue 10/206:30 am -
2 stops11h 24m
Tue 10/276:10 am -
2 stops14h 39m
Deal found 9/16![Frontier logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/206:30 am -
2 stops13h 04m
Wed 10/2810:43 am -
1 stop11h 14m
Deal found 9/17![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/216:30 am -
2 stops11h 24m
Wed 10/2810:43 am -
1 stop11h 14m
Deal found 9/16![Frontier logo]()
$194
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Fri 10/231:16 pm -
1 stop20h 50m
Wed 10/2810:43 am -
1 stop23h 41m
Deal found 9/16![Frontier logo]()
$196
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 September 19, 2026.
Search for one-way flight options from Raleigh to Boulder. Find affordable one-way fares based on user searches. Data last updated September 19, 2026.
This Frontier deal was found by Cheapflights users on 9/18. 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 10/175:26 pm -
1 stop8h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$109
This Expedia deal was found by Cheapflights users on 9/16. 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.
Sat 10/101:40 pm -
1 stop10h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 11/51:19 pm -
2 stops45h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$112
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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.
Thu 10/229:27 pm -
1 stop24h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$113
This Booking.com deal was found by Cheapflights users on 9/14. 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.
Tue 10/134:20 pm -
1 stop7h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$114
This Mytrip deal was found by Cheapflights users on 9/17. 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.
Wed 10/286:30 am -
2 stops11h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/59:35 pm -
2 stops36h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 10/259:46 pm -
2 stops36h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Multiple Airlines logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/259:27 pm -
2 stops36h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$123
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 September 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $194 (Kiwi.com) |
One-way from | $109 (Frontier) |
Popular in | July |
Cheapest in | January |
Average price | $376 |
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 7,457,451 searches. Data last updated September 19, 2026.
Use the filters below to find and compare flights from Raleigh to Boulder that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Thu 2/25
6:30 pm-11:19 pm
1 stop6h 49m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$139
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Sat 1/30
6:15 am-10:35 am
1 stop6h 20m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$175
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Thu 12/24
5:40 am-7:40 am
Nonstop4h 00m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$192
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Tue 10/13
6:40 am-11:25 am
2 stops6h 45m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$197
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Sat 10/24
4:27 pm-6:19 pm
Nonstop3h 52m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$221
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Tue 12/22
7:35 am-1:15 pm
2 stops7h 40m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$230
Quickest round-trip
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Tue 10/13
8:15 am-10:05 am
Nonstop3h 50m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$248
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Thu 12/24
4:10 pm-6:16 pm
Nonstop4h 06m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$270
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Fri 10/16
7:21 pm-11:44 pm
1 stop6h 23m
Denver Intl
Wed 10/21
12:59 am-8:45 am
1 stop5h 46m
$286
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Sun 11/15
5:45 am-7:45 am
Nonstop4h 00m
Denver Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$292
Showing 1-10 of 22 resultsSorted by cheapest first
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
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 19, 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 in the evening could potentially save you up to 39% on airfare.
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 19, 2026.
The most flights from RDU to BD9 are scheduled on a Friday (7 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).
How much does it cost to fly round-trip from Raleigh to Boulder?
Airfare is below average for this route at the moment.
Raleigh to Boulder flights typically cost between $248 and $481 in October.The cheapest round-trip price found within the last 5 days was $194 on Frontier (Oct 21-Oct 28).
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 September 12, 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.
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 19, 2026.
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.
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Boarding
8.1
Overall
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
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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Raleigh and 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 7,457,451 searches. Data last updated September 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$274 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$342 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$434 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$200 | Average$433 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$211 | Average$478 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$229 | Average$477 | FlexibilityNo cancel fee | On-time63% |