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HK$3,489+ Cheap flights to Boulder

— DEN
19 Sep — 26 Sep1
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

Thu 3-922:30 -
1 stop25h 33m
Wed 16-921:23 -
1 stop18h 17m
Deal found 18-8HK$5,583
Thu 5-1122:30 -
1 stop16h 29m
Mon 9-1111:43 -
2 stops28h 02m
Deal found 17-8HK$5,646
Thu 3-911:45 -
1 stop27h 14m
Wed 16-910:05 -
1 stop18h 25m
Deal found 18-8HK$5,654
Fri 2-1011:45 -
1 stop22h 19m
Fri 9-1013:30 -
2 stops25h 30m
Deal found 18-8HK$6,446
Thu 3-912:20 -
2 stops21h 41m
Wed 16-908:06 -
1 stop30h 59m
Deal found 18-8HK$6,571
Mon 7-909:25 -
1 stop28h 33m
Sun 20-919:55 -
1 stop19h 10m
Deal found 19-8HK$6,587
Thu 5-1112:35 -
2 stops26h 18m
Mon 9-1106:25 -
2 stops25h 45m
Deal found 16-8HK$6,657
Tue 25-812:40 -
1 stop19h 18m
Sat 29-809:36 -
1 stop19h 19m
Deal found 18-8HK$6,767
Sun 25-1014:00 -
2 stops22h 37m
Fri 30-1017:57 -
2 stops26h 33m
Deal found 20-8HK$7,410
Wed 30-900:45 -
2 stops30h 48m
Thu 8-1018:42 -
2 stops38h 03m
Deal found 17-8HK$7,426
Sat 3-1000:45 -
2 stops36h 50m
Sun 11-1006:05 -
2 stops26h 40m
Deal found 19-8HK$7,434

Find flight deals to Boulder

Return from

HK$5,583

One-way from

HK$3,489

Popular in

June

Cheapest in

April

Average price

HK$7,096
Lufthansa
  • Lufthansa
  • 3-9-16-9
  • 2 total stops
  • 43h 50m total
  • Hong Kong to Denver
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16-9
  • 16-9
  • 2 total stops
  • 34h 16m total
  • Hong Kong to Boulder
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (HK$2,407 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (HK$663 potential savings vs. average return price).
Search Deals
Average for return flights in August 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

Thu 1-10

11:45-20:04

1 stop22h 19m

Denver Intl

Thu 8-10

08:00-18:55

2 stops20h 55m

HK$5,646

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Thu 5-11

22:30-23:59

1 stop16h 29m

Denver Intl

Mon 9-11

13:30-07:00

1 stop26h 30m

HK$5,646
Fastest return journey

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Wed 9-9

11:45-20:07

1 stop22h 22m

Denver Intl

Thu 8-10

21:18-05:40

1 stop18h 22m

HK$5,646

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Sun 25-10

10:35-22:10

1 stop25h 35m

Denver Intl

Fri 30-10

09:50-19:15

1 stop19h 25m

HK$6,446

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Fri 2-10

22:30-08:40

1 stop24h 10m

Denver Intl

Fri 9-10

21:18-05:40

1 stop18h 22m

HK$6,446

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Sun 6-9

00:45-20:01

2 stops33h 16m

Denver Intl

Sun 20-9

12:25-05:05

1 stop26h 40m

HK$6,571

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Thu 5-11

12:35-23:53

2 stops26h 18m

Denver Intl

Mon 9-11

06:25-23:10

2 stops25h 45m

HK$6,657
Cheapest one-way

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Tue 1-12

12:35-23:47

2 stops26h 12m

HK$4,376
Fastest single journey

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Mon 14-9

09:25-18:11

1 stop22h 46m

HK$4,391

Hong KongDenver

HKG Hong Kong Intl - DEN Denver Intl

HKGDEN

Hong Kong Intl

Wed 18-11

10:45-18:54

1 stop23h 09m

HK$4,423

Flights are sorted by cheapest return flights first.

Deals found on 17-8

Showing 1-10 of 14 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 29 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$4,883

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
10,102 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.7

Overall

7.4

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
10,102 reviews
United Airlines
7.4
Good
10,102 reviews
Check prices

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Food

6.7

Overall

7.4

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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