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HK$3,645+ 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 20-6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
26 Apr — 3 May1
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 27 March 2026.

Thu 7-522:30
HKG
-
DEN
1 stop31h 13m
United Airlines
Thu 14-506:00
DEN
-
HKG
1 stop22h 30m
United Airlines
Deal found 23-3HK$6,344
Tue 10-1110:35
HKG
-
DEN
1 stop16h 55m
United Airlines
Sat 14-1111:24
DEN
-
HKG
2 stops28h 21m
United Airlines
Deal found 24-3HK$6,375
Fri 20-1119:45
HKG
-
DEN
2 stops43h 03m
星宇航空
Tue 24-1117:00
DEN
-
HKG
2 stops34h 30m
星宇航空
Deal found 26-3HK$7,752
Wed 24-600:45
HKG
-
DEN
2 stops37h 00m
Delta
Mon 29-605:40
DEN
-
HKG
2 stops27h 05m
Delta
Deal found 25-3HK$8,033
Mon 20-411:45
HKG
-
DEN
1 stop27h 00m
United Airlines
Mon 4-515:44
DEN
-
HKG
2 stops23h 16m
United Airlines
Deal found 24-3HK$8,049
Thu 25-622:30
HKG
-
DEN
1 stop27h 52m
United Airlines
Mon 29-606:04
DEN
-
HKG
1 stop22h 26m
United Airlines
Deal found 25-3HK$8,112
Tue 10-1109:45
HKG
-
DEN
2 stops23h 33m
Air Canada
Sat 14-1111:15
DEN
-
HKG
2 stops26h 55m
Air Canada
Deal found 23-3HK$8,456
Mon 6-713:30
HKG
-
DEN
2 stops25h 10m
Multiple Airlines
Mon 20-719:16
DEN
-
HKG
2 stops31h 04m
Multiple Airlines
Deal found 24-3HK$8,644
Mon 20-412:20
HKG
-
DEN
2 stops24h 39m
Multiple Airlines
Mon 4-512:51
DEN
-
HKG
2 stops32h 49m
Multiple Airlines
Deal found 24-3HK$8,651

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 27 March 2026.

Return from

HK$6,344

One-way from

HK$3,645

Popular in

January

Cheapest in

November

Average price

HK$7,799
United Airlines
  • United Airlines
  • 7-5-14-5
  • 2 total stops
  • 53h 43m total
  • Hong Kong to Denver
Search Deals
Delta
  • Delta
  • 21-6
  • 2 total stops
  • 37h 58m total
  • Hong Kong to Boulder
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (HK$761 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (HK$239 potential savings vs. average return price).
Search Deals
Average for return flights in March 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 27 March 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

Tue 8-9

11:45-18:10

1 stop20h 25m

Denver Intl

Sat 12-9

15:45-05:00

2 stops23h 15m

HK$6,375

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Mon 20-4

11:45-00:45

1 stop27h 00m

Denver Intl

Mon 4-5

15:44-05:00

2 stops23h 16m

HK$8,049

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Thu 25-6

22:30-08:35

1 stop24h 05m

Denver Intl

Mon 29-6

06:04-18:55

2 stops22h 51m

HK$8,816

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Tue 14-7

22:30-08:35

1 stop24h 05m

Denver Intl

Tue 1-9

06:00-18:55

2 stops22h 55m

HK$9,222

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Tue 2-6

13:30-22:45

2 stops23h 15m

Denver Intl

Mon 8-6

07:50-19:55

2 stops22h 05m

HK$9,637
Fastest return journey

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Mon 18-5

11:45-16:29

1 stop18h 44m

Denver Intl

Sat 23-5

10:02-18:30

1 stop18h 28m

HK$10,012

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Mon 20-4

00:55-22:45

2 stops35h 50m

Denver Intl

Tue 28-4

12:24-16:45

2 stops38h 21m

HK$10,278

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Thu 25-6

20:10-09:50

3 stops27h 40m

Denver Intl

Mon 29-6

21:15-09:15

2 stops22h 00m

HK$10,795

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Tue 2-6

23:05-16:15

1 stop31h 10m

Denver Intl

Mon 8-6

17:50-16:35

1 stop32h 45m

HK$11,068

Hong KongDenver

HKG - DEN

HKGDEN

Hong Kong Intl

Mon 18-5

16:05-21:59

1 stop19h 54m

Denver Intl

Sat 23-5

06:00-16:45

1 stop20h 45m

HK$11,225

Flights are sorted by cheapest return flights first.

Deals found on 22-3

Showing 1-10 of 18 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 44 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$4,872

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 27 March 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
9,491 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,491 reviews
United Airlines
7.4
Good
9,491 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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$1,541, 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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