$125+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — DEN
Sep 5 — Sep 121
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 49 days in advance, depart on a Thursday or Friday 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 August 6, 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 August 6, 2026.
This Frontier deal was found by Cheapflights users on 8/4. 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 9/55:58 pm -
1 stop23h 20m
Fri 9/1111:46 am -
Nonstop3h 36m
Deal found 8/4![Frontier logo]()
$238
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 8/246:05 am -
2 stops10h 38m
Tue 8/251:38 pm -
Nonstop3h 31m
Deal found 8/3![Frontier logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 11/1212:48 pm -
Nonstop4h 04m
Sat 11/146:30 am -
1 stop6h 28m
Deal found 8/4![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 8/246:05 am -
2 stops10h 38m
Wed 8/261:38 pm -
Nonstop3h 31m
Deal found 8/3![Frontier logo]()
$241
This Frontier deal was found by Cheapflights users on 8/3. 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 9/57:54 pm -
Nonstop3h 55m
Wed 9/911:46 am -
Nonstop3h 36m
Deal found 8/3![Frontier logo]()
$242
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/277:54 pm -
Nonstop3h 55m
Sun 8/301:28 pm -
Nonstop3h 31m
Deal found 8/4![Frontier logo]()
$243
This Frontier deal was found by Cheapflights users on 8/1. 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 9/116:17 pm -
Nonstop3h 58m
Mon 9/1411:46 am -
Nonstop3h 36m
Deal found 8/1![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 8/227:54 pm -
Nonstop3h 55m
Tue 8/251:38 pm -
Nonstop3h 31m
Deal found 8/2![Frontier logo]()
$245
This Frontier deal was found by Cheapflights users on 8/1. 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 9/129:35 pm -
1 stop12h 02m
Wed 9/169:19 pm -
1 stop11h 51m
Deal found 8/1![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 8/5. 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 9/191:56 pm -
1 stop9h 28m
Sat 9/2610:28 am -
1 stop8h 10m
Deal found 8/5![Frontier logo]()
$247
This Frontier deal was found by Cheapflights users on 8/4. 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 9/191:56 pm -
1 stop9h 28m
Thu 9/249:19 pm -
1 stop11h 51m
Deal found 8/4![Frontier logo]()
$248
This Frontier deal was found by Cheapflights users on 8/3. 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.
Thu 9/174:49 pm -
1 stop7h 19m
Thu 9/2410:44 am -
1 stop11h 45m
Deal found 8/3![Frontier logo]()
$249
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 August 6, 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 August 6, 2026.
This Southwest deal was found by Cheapflights users on 8/6. 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.
Sat 9/51:55 pm -
Nonstop3h 40m
Fri 9/116:50 pm -
Nonstop3h 25m
Deal found 8/6![Southwest logo]()
$317
This United Airlines deal was found by Cheapflights users on 8/1. 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 9/38:15 am -
Nonstop3h 50m
Mon 9/75:55 pm -
Nonstop3h 31m
Deal found 8/1![United Airlines logo]()
$395
This Alaska Airlines deal was found by Cheapflights users on 8/3. 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.
Sun 11/85:19 pm -
1 stop31h 31m
Fri 11/132:55 pm -
2 stops24h 54m
Deal found 8/3![Alaska Airlines logo]()
$448
This Delta deal was found by Cheapflights users on 8/1. 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.
Sun 12/205:50 pm -
1 stop6h 27m
Fri 12/2510:45 am -
1 stop5h 02m
Deal found 8/1![Delta logo]()
$450
This Southwest deal was found by Cheapflights users on 8/1. 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.
Sat 10/176:00 am -
2 stops9h 50m
Wed 10/2110:55 am -
2 stops7h 00m
Deal found 8/1![Southwest logo]()
$375
This Southwest deal was found by Cheapflights users on 8/4. 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 stops7h 55m
Sat 10/2411:30 am -
2 stops6h 50m
Deal found 8/4![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 8/1. 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 12/258:15 am -
Nonstop3h 59m
Thu 12/315:35 pm -
Nonstop3h 30m
Deal found 8/1![United Airlines logo]()
$421
This Southwest deal was found by Cheapflights users on 8/2. 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 11/118:05 am -
2 stops7h 40m
Mon 11/1610:50 am -
2 stops8h 10m
Deal found 8/2![Southwest logo]()
$375
This United Airlines deal was found by Cheapflights users on 8/5. 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 9/24:23 pm -
Nonstop3h 57m
Mon 9/75:55 pm -
Nonstop3h 31m
Deal found 8/5![United Airlines logo]()
$422
This Southwest deal was found by Cheapflights users on 8/5. 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.
Mon 1/255:55 am -
Nonstop4h 05m
Fri 1/298:55 am -
2 stops7h 25m
Deal found 8/5![Southwest logo]()
$410
This Southwest deal was found by Cheapflights users on 8/3. 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.
Mon 10/56:10 am -
1 stop5h 40m
Mon 10/511:25 am -
2 stops7h 40m
Deal found 8/3![Southwest logo]()
$420
This Southwest deal was found by Cheapflights users on 8/5. 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 10/215:40 pm -
Nonstop3h 50m
Sun 10/2510:30 am -
Nonstop3h 25m
Deal found 8/5![Southwest logo]()
$444
Last-minute flights from Raleigh to BoulderDiscover last-minute flight deals from Raleigh to Boulder. Data last updated August 6, 2026 and is based on user searches.
Discover last-minute flight deals from Raleigh to Boulder. Data last updated August 6, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 8/227:54 pm -
Nonstop3h 55m
Tue 8/251:38 pm -
Nonstop3h 31m
Deal found 8/2![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 8/246:05 am -
2 stops10h 38m
Tue 8/251:38 pm -
Nonstop3h 31m
Deal found 8/3![Frontier logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 8/246:05 am -
2 stops10h 38m
Wed 8/261:38 pm -
Nonstop3h 31m
Deal found 8/3![Frontier logo]()
$241
This Super.com deal was found by Cheapflights users on 8/4. 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 8/269:26 am -
1 stop6h 10m
Tue 9/81:38 pm -
Nonstop3h 31m
Deal found 8/4![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/277:54 pm -
Nonstop3h 55m
Sun 8/301:28 pm -
Nonstop3h 31m
Deal found 8/4![Frontier logo]()
$243
This Frontier deal was found by Cheapflights users on 8/4. 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 9/55:58 pm -
1 stop23h 20m
Fri 9/1111:46 am -
Nonstop3h 36m
Deal found 8/4![Frontier logo]()
$238
This Frontier deal was found by Cheapflights users on 8/3. 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 9/57:54 pm -
Nonstop3h 55m
Wed 9/911:46 am -
Nonstop3h 36m
Deal found 8/3![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 8/1. 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 9/116:17 pm -
Nonstop3h 58m
Mon 9/1411:46 am -
Nonstop3h 36m
Deal found 8/1![Frontier logo]()
$244
This Frontier deal was found by Cheapflights users on 8/1. 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 9/129:35 pm -
1 stop12h 02m
Wed 9/169:19 pm -
1 stop11h 51m
Deal found 8/1![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 8/3. 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.
Thu 9/174:49 pm -
1 stop7h 19m
Thu 9/2410:44 am -
1 stop11h 45m
Deal found 8/3![Frontier logo]()
$249
This Frontier deal was found by Cheapflights users on 8/5. 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 9/191:56 pm -
1 stop9h 28m
Sat 9/2610:28 am -
1 stop8h 10m
Deal found 8/5![Frontier logo]()
$247
This Frontier deal was found by Cheapflights users on 8/4. 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 9/191:56 pm -
1 stop9h 28m
Thu 9/249:19 pm -
1 stop11h 51m
Deal found 8/4![Frontier logo]()
$248
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 August 6, 2026.
Search for one-way flight options from Raleigh to Boulder. Find affordable one-way fares based on user searches. Data last updated August 6, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/119:03 pm -
2 stops26h 21m
Deal found 8/3![Multiple Airlines logo]()
$125
This Super.com deal was found by Cheapflights users on 8/4. 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.
Mon 9/77:54 pm -
Nonstop3h 55m
Deal found 8/4![Frontier logo]()
$126
This iWofly deal was found by Cheapflights users on 8/4. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:17 pm -
Nonstop3h 58m
Deal found 8/4![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 8/4. 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.
Wed 9/27:54 pm -
Nonstop3h 55m
Deal found 8/4![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 10/19:46 pm -
2 stops25h 38m
Deal found 8/3![Multiple Airlines logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 9/78:29 pm -
2 stops27h 36m
Deal found 8/4![Multiple Airlines logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/244:02 pm -
1 stop19h 17m
Deal found 8/4![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 9/239:35 pm -
2 stops21h 41m
Deal found 8/2![Frontier logo]()
$133
This CheapOair deal was found by Cheapflights users on 8/1. 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.
Mon 12/712:31 pm -
1 stop29h 55m
Deal found 8/1![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/3010:11 pm -
2 stops18h 32m
Deal found 8/4![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/2510:11 pm -
2 stops17h 09m
Deal found 8/4![Frontier logo]()
$136
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 August 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $238 (Frontier) |
One-way from | $125 (Kiwi.com) |
Popular in | July |
Cheapest in | January |
Average price | $346 |
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 August 6, 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
Quickest round-trip
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Sat 9/5
1:55 pm-3:35 pm
Nonstop3h 40m
Denver Intl
Fri 9/11
6:50 pm-12:15 am
Nonstop3h 25m
$317
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Sat 10/17
6:00 am-1:50 pm
2 stops9h 50m
Denver Intl
Wed 10/21
10:55 am-7:55 pm
2 stops7h 00m
$375
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Thu 10/22
5:50 pm-11:45 pm
2 stops7h 55m
Denver Intl
Sat 10/24
11:30 am-8:20 pm
2 stops6h 50m
$375
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Wed 11/11
8:05 am-1:45 pm
2 stops7h 40m
Denver Intl
Mon 11/16
10:50 am-9:00 pm
2 stops8h 10m
$375
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Thu 9/3
8:15 am-10:05 am
Nonstop3h 50m
Denver Intl
Mon 9/7
5:55 pm-11:26 pm
Nonstop3h 31m
$395
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Mon 1/25
5:55 am-8:00 am
Nonstop4h 05m
Denver Intl
Fri 1/29
8:55 am-6:20 pm
2 stops7h 25m
$410
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Mon 10/5
6:10 am-9:50 am
1 stop5h 40m
Denver Intl
Mon 10/5
11:25 am-9:05 pm
2 stops7h 40m
$420
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Fri 12/25
8:15 am-10:14 am
Nonstop3h 59m
Denver Intl
Thu 12/31
5:35 pm-11:05 pm
Nonstop3h 30m
$421
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Wed 9/2
4:23 pm-6:20 pm
Nonstop3h 57m
Denver Intl
Mon 9/7
5:55 pm-11:26 pm
Nonstop3h 31m
$422
RaleighDenver
RDU Raleigh-Durham - DEN Denver Intl
RDUDEN
Raleigh-Durham
Wed 10/21
5:40 pm-7:30 pm
Nonstop3h 50m
Denver Intl
Sun 10/25
10:30 am-3:55 pm
Nonstop3h 25m
$444
Showing 1-10 of 23 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 August 6, 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.
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 August 6, 2026.
The most flights from RDU to BD9 are scheduled on a Wednesday (6 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 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 $243 and $465 in September.The cheapest round-trip price found within the last 5 days was $238 on Frontier (Sep 5-Sep 11).
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 August 1, 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 August 6, 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.
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Food
7.0
Comfort
8.0
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 2,558,603 searches. Data last updated August 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$265 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$374 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$444 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$200 | Average$426 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$208 | Average$471 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$217 | Average$467 | FlexibilityNo cancel fee | On-time63% |