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HK$3,541+ 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 18-11. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
10 Sep — 17 Sep1
1 adult

Flights to Boulder in 2025

Find the latest flights to Boulder in 2025, 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 5 September 2025.

Return from

HK$5,429

One-way from

HK$3,541

Popular in

May

Cheapest in

February

Average price

HK$6,903
United Airlines
  • United Airlines
  • 2-3-5-3
  • 3 total stops
  • 44h 55m total
  • Hong Kong to Denver
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18-11
  • 18-11
  • 2 total stops
  • 40h 14m total
  • Hong Kong to Boulder
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (HK$2,672 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (HK$1,875 potential savings vs. average return price).
Search Deals
Average for return flights in September 2025
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Find flight deals to Boulder

Best flights to Boulder
Discover carefully curated flight deals to Boulder that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 September 2025.

Mon 2-310:35HKG - DEN
1 stop24h 04mUnited Airlines
Thu 5-313:29DEN - HKG
2 stops26h 16mUnited Airlines
Deal found 2-9HK$5,429
Mon 2-313:15HKG - DEN
2 stops23h 46mAsiana Airlines
Thu 5-306:00DEN - HKG
2 stops25h 30mAsiana Airlines
Deal found 2-9HK$8,369
Sun 1-300:55HKG - DEN
2 stops34h 08mDelta
Thu 5-307:05DEN - HKG
2 stops25h 05mDelta
Deal found 2-9HK$10,366
Sun 1-300:55HKG - DEN
2 stops33h 24mKorean Air
Thu 5-307:00DEN - HKG
2 stops25h 10mKorean Air
Deal found 3-9HK$11,193

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 5 September 2025.
Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Hong Kong

Route

Departure

Return

Price

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Mon 2-3

10:35-19:39

1 stop24h 04m

Denver Intl

Thu 5-3

13:29-06:45

2 stops26h 16m

HK$5,429

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Mon 2-3

13:15-22:01

2 stops23h 46m

Denver Intl

Thu 5-3

06:00-22:30

2 stops25h 30m

HK$8,369

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Sun 1-3

00:55-20:03

2 stops34h 08m

Denver Intl

Thu 5-3

07:05-23:10

2 stops25h 05m

HK$10,366

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Sun 1-3

00:55-19:19

2 stops33h 24m

Denver Intl

Thu 5-3

07:00-23:10

2 stops25h 10m

HK$11,193

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Tue 18-11

22:45-23:59

2 stops40h 14m

HK$3,541

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Sun 12-10

23:00-10:19

2 stops49h 19m

HK$3,728

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Tue 30-9

18:20-17:13

2 stops36h 53m

HK$3,736

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Wed 10-9

20:00-04:00

3 stops46h 00m

HK$3,837

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Sat 22-11

22:45-16:48

2 stops57h 03m

HK$3,853

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Fri 12-9

18:20-08:58

3 stops28h 38m

HK$3,876

Flights are sorted by cheapest return flights first.

Deals found on 3-9

Showing 1-10 of 13 results
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 20 hours 56 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$831

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 5 September 2025.
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
8,935 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
United Airlines
7.4
Good
8,935 reviews
United Airlines
7.4
Good
8,935 reviews
Check prices

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.

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$1,141, however they can be found for as little as HK$108.

  • 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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