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HK$3,862+ Cheap flights to Boulder

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 21-6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
21 Jun — 28 Jun1
1 adult
1 adult, Economy, 0 bags

Flights to Boulder in 2026

Enter your travel dates to find the best prices.

Cheapest flights to Boulder
Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on 22 May 2026.

Wed 17-611:45
HKG
-
DEN
1 stop20h 27m
United Airlines
Wed 8-713:26
DEN
-
HKG
2 stops25h 34m
United Airlines
Deal found 19-5HK$5,178
Sun 14-609:45
HKG
-
DEN
2 stops38h 48m
Air Canada
Mon 22-619:18
DEN
-
HKG
2 stops43h 57m
Air Canada
Deal found 18-5HK$6,369
Thu 3-912:20
HKG
-
DEN
2 stops20h 50m
Delta
Wed 23-905:40
DEN
-
HKG
2 stops33h 25m
Delta
Deal found 22-5HK$6,494
Tue 1-912:20
HKG
-
DEN
2 stops20h 50m
Delta
Sun 20-907:05
DEN
-
HKG
2 stops32h 00m
Delta
Deal found 22-5HK$6,502
Sat 5-909:25
HKG
-
DEN
1 stop22h 45m
Delta
Mon 21-919:15
DEN
-
HKG
1 stop19h 50m
Delta
Deal found 22-5HK$6,510
Sat 5-909:25
HKG
-
DEN
2 stops19h 46m
Delta
Sun 20-915:40
DEN
-
HKG
2 stops23h 25m
Delta
Deal found 22-5HK$6,517
Wed 2-911:45
HKG
-
DEN
1 stop22h 22m
United Airlines
Sun 6-917:45
DEN
-
HKG
2 stops21h 15m
United Airlines
Deal found 17-5HK$6,799
Wed 17-609:05
HKG
-
DEN
2 stops25h 23m
Multiple Airlines
Wed 8-709:10
DEN
-
HKG
2 stops23h 35m
Multiple Airlines
Deal found 19-5HK$7,121
Sun 14-621:45
HKG
-
DEN
1 stop24h 37m
Multiple Airlines
Mon 22-605:20
DEN
-
HKG
1 stop23h 35m
Multiple Airlines
Deal found 18-5HK$7,967
Wed 22-711:45
HKG
-
DEN
1 stop24h 59m
United Airlines
Tue 27-1019:45
DEN
-
HKG
1 stop33h 30m
United Airlines
Deal found 18-5HK$7,974
Wed 2-911:20
HKG
-
DEN
2 stops25h 56m
星宇航空
Sun 6-919:30
DEN
-
HKG
2 stops24h 25m
星宇航空
Deal found 19-5HK$8,045

Find flight deals to Boulder

Find the latest flights to Boulder in 2026, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 70,647 searches and data was last updated on 22 May 2026.

Return from

HK$5,178

One-way from

HK$3,862

Popular in

June

Cheapest in

April

Average price

HK$5,538
United Airlines
  • United Airlines
  • 17-6-8-7
  • 3 total stops
  • 46h 01m total
  • Hong Kong to Denver
Search Deals
Delta
  • Delta
  • 21-6
  • 2 total stops
  • 27h 16m total
  • Hong Kong to Boulder
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (HK$669 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (HK$305 potential savings vs. average return price).
Search Deals
Average for return flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Locate flights to Boulder that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 70,647 searches and data was last updated on 22 May 2026.
Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Route

Departure

Return

Price

Cheapest return flight

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Fri 26-6

11:45-20:01

1 stop22h 16m

Denver Intl

Fri 24-7

13:26-05:40

1 stop26h 14m

HK$5,178

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Wed 17-6

11:45-18:12

1 stop20h 27m

Denver Intl

Wed 8-7

13:26-05:00

2 stops25h 34m

HK$5,178

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Thu 3-9

00:45-19:10

2 stops32h 25m

Denver Intl

Mon 21-9

19:15-05:05

1 stop19h 50m

HK$6,494

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Thu 3-9

00:45-19:10

2 stops32h 25m

Denver Intl

Sun 20-9

07:05-05:05

2 stops32h 00m

HK$6,502
Fastest return journey

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Sat 5-9

09:25-18:10

1 stop22h 45m

Denver Intl

Mon 21-9

19:15-05:05

1 stop19h 50m

HK$6,510

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Wed 2-9

11:45-16:25

1 stop18h 40m

Denver Intl

Sun 6-9

13:30-05:00

2 stops25h 30m

HK$6,799

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Wed 22-7

11:45-23:43

1 stop25h 58m

Denver Intl

Tue 27-10

11:24-05:45

2 stops28h 21m

HK$7,974

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Wed 22-7

11:45-23:43

1 stop25h 58m

Denver Intl

Wed 21-10

17:45-05:40

1 stop21h 55m

HK$7,974

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Wed 2-9

11:20-23:16

2 stops25h 56m

Denver Intl

Sun 6-9

19:30-09:55

2 stops24h 25m

HK$8,045
Cheapest one-way

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Sun 21-6

09:25-17:58

1 stop22h 33m

HK$3,862

Flights are sorted by cheapest return flights first.

Deals found on 19-5

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Best time to book a flight to Boulder

Have a flexible travel schedule? Discover the best time to fly to Boulder with our price prediction graph.
Estimated return 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 to Boulder

How long is the flight to Boulder?

On average, a flight from Hong Kong to Boulder takes 18 hours 40 minutes. Flights to Boulder from other popular cities in Hong Kong will vary in length. Below are a few examples of popular routes and their flight times.

What are the most popular airlines that fly to Boulder?

The most popular airline flying from Hong Kong to Boulder is United Airlines.

United Airlines
United Airlines
From HK$4,879

What are the cheapest airlines that fly to Boulder?

The cheapest airline flying from Hong Kong to Boulder is United Airlines.

Rainfall in Boulder by month

Plan your trip to Boulder by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Boulder ranges from 13.0 - 58.0 mm per month. May is typically the wettest month, when rainfall can reach 58.0 mm. January is typically the driest time to visit Boulder when rainfall is around 13.0 mm.

Temperature in Boulder by month

Plan your trip to Boulder by taking into account the average temperature totals by month.

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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

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 22 May 2026.
Check out reviews from past customers who have flown United Airlines to the United States to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,751 reviews
Check prices

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,751 reviews
United Airlines
7.4
Good
9,751 reviews
Check prices

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

FAQs about flying to Boulder

  • Can I find cheaper flights to Boulder if I am willing to have stopovers?

    Yes, flights with stopovers are often cheaper than direct flights. Keep an eye out for flight deals to Boulder on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to Boulder?

    Based on reviews from Cheapflights users, United Airlines is rated the highest out of the airlines that fly to Boulder.

  • How much is a return flight to Boulder?

    A return flight to Boulder will typically cost around HK$1,543, however they can be found for as little as HK$412.

  • Does Denver Intl have rental cars?

    Yes. Those touching down at Denver Intl can take advantage of the car hire services offered upon their arrival.

  • Are there hotels close to Denver Intl?

    Yes. Denver Intl has hotels nearby for those requiring accommodations. The Westin Denver International Airport is the closest property to Denver Intl (0.0 km away from Denver Intl).

See more FAQs

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