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HK$3,773+ Cheap flights to Boulder

— DEN
17 Oct — 24 Oct1
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

Wed 18-1100:55 -
2 stops31h 42m
Tue 24-1112:37 -
1 stop28h 03m
Deal found 17-9HK$5,397
Mon 14-1210:35 -
2 stops22h 19m
Thu 21-117:50 -
2 stops21h 55m
Deal found 16-9HK$5,413
Mon 14-1212:35 -
2 stops19h 44m
Wed 20-118:30 -
2 stops37h 40m
Deal found 16-9HK$5,452
Mon 26-1010:35 -
1 stop20h 01m
Thu 29-1016:05 -
1 stop24h 55m
Deal found 15-9HK$5,648
Mon 14-1210:35 -
1 stop24h 42m
Wed 20-107:58 -
1 stop20h 17m
Deal found 14-9HK$5,719
Fri 30-1000:55 -
2 stops37h 00m
Sat 7-1112:57 -
2 stops27h 43m
Deal found 15-9HK$6,197
Mon 26-1012:35 -
2 stops20h 59m
Thu 29-1007:05 -
2 stops26h 05m
Deal found 15-9HK$6,283
Fri 30-1010:35 -
1 stop23h 24m
Fri 6-1109:50 -
2 stops29h 55m
Deal found 14-9HK$6,448
Tue 15-1212:35 -
2 stops22h 57m
Tue 19-112:59 -
1 stop27h 41m
Deal found 13-9HK$6,581

Find flight deals to Boulder

Return from

HK$5,397

One-way from

HK$3,773

Popular in

June

Cheapest in

April

Average price

HK$5,570
Delta
  • Delta
  • 18-11-24-11
  • 3 total stops
  • 59h 45m total
  • Hong Kong to Denver
Search Deals
28-9-31-12
  • 28-9-31-12
  • 2 total stops
  • 28h 34m total
  • Hong Kong to Boulder
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (HK$2,621 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease (HK$760 potential savings vs. average return price).
Search Deals
Average for return flights in September 2026
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Cheapflights Fare Finder

 
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 Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Mon 14-12

00:55-17:37

2 stops31h 42m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$3,993

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Mon 28-9

00:45-23:47

2 stops37h 02m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$3,993

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Sun 13-12

00:55-23:48

2 stops37h 53m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$3,993
Fastest return journey

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Tue 15-12

11:25-17:54

1 stop21h 29m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,001

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Thu 1-10

21:45-22:29

1 stop38h 44m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,001

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Mon 14-12

22:30-22:15

1 stop38h 45m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,001

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Thu 1-10

09:25-23:54

1 stop28h 29m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,001

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Tue 29-9

11:45-10:03

1 stop36h 18m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,001

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Mon 28-9

09:25-11:22

1 stop39h 57m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,393

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Sat 24-10

21:45-12:13

1 stop28h 28m

Denver Intl

Wed 31-12

00:00-15:00

Nonstop0h 00m

HK$4,526

Flights are sorted by cheapest return flights first.

Deals found on 16-9

Showing 1-10 of 17 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

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 16 hours 55 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$4,885

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

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

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

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
10,214 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Food

6.7

Overall

7.4

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.4
Good
10,214 reviews
United Airlines
7.4
Good
10,214 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Food

6.7

Overall

7.4

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

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$1,545, however they can be found for as little as HK$413.

  • 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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