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S$ 744+ 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 12-11. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
29 Aug — 5 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
Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on 30 July 2026.

Thu 10-922:00
SIN
-
DEN
2 stops39h 58m
Korean Air
Fri 25-906:00
DEN
-
SIN
2 stops27h 55m
Korean Air
Deal found 29-7S$ 1,197
Thu 10-920:50
SIN
-
DEN
2 stops34h 08m
Air Canada
Fri 25-909:10
DEN
-
SIN
1 stop30h 05m
Air Canada
Deal found 29-7S$ 1,198
Thu 10-907:00
SIN
-
DEN
2 stops39h 47m
Air Canada
Thu 24-919:16
DEN
-
SIN
2 stops43h 59m
Air Canada
Deal found 25-7S$ 1,205
Sun 13-907:00
SIN
-
DEN
1 stop23h 58m
Multiple Airlines
Sat 19-919:50
DEN
-
SIN
2 stops25h 55m
Multiple Airlines
Deal found 27-7S$ 1,209
Sat 29-807:00
SIN
-
DEN
2 stops39h 47m
Air Canada
Fri 11-907:51
DEN
-
SIN
1 stop31h 24m
Air Canada
Deal found 26-7S$ 1,217
Tue 13-1007:00
SIN
-
DEN
1 stop23h 58m
Air Canada
Fri 30-1019:00
DEN
-
SIN
1 stop22h 00m
Air Canada
Deal found 27-7S$ 1,240
Thu 3-1208:40
SIN
-
DEN
1 stop18h 58m
Air Canada
Sun 27-1208:15
DEN
-
SIN
1 stop31h 45m
Air Canada
Deal found 28-7S$ 1,248

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 200,618 searches and data was last updated on 30 July 2026.

Return from

S$ 1,197

One-way from

S$ 744

Popular in

January

Cheapest in

September

Average price

S$ 1,619
Korean Air
  • Korean Air
  • 10-9-25-9
  • 4 total stops
  • 67h 53m total
  • Singapore to Denver
Search Deals
12-11
  • 12-11
  • 2 total stops
  • 39h 43m total
  • Singapore to Boulder
Search Deals
Highest demand for flights based on searches. 0% potential increase in price.
Search Deals
Cheapest flight prices on average. 1% potential price decrease (S$ 18 potential savings vs. average return price).
Search Deals
Average for return flights in July 2026
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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 200,618 searches and data was last updated on 30 July 2026.
Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 10-9

07:00-18:18

1 stop25h 18m

Denver Intl

Thu 24-9

07:51-05:15

1 stop31h 24m

S$ 1,245

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Fri 11-9

22:50-23:08

2 stops38h 18m

Denver Intl

Sun 20-9

19:50-11:45

2 stops25h 55m

S$ 1,259

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 20-12

08:40-18:04

2 stops48h 24m

Denver Intl

Fri 8-1

08:15-07:00

1 stop31h 45m

S$ 1,291

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Fri 11-9

08:45-19:45

2 stops25h 00m

Denver Intl

Sun 20-9

19:25-18:35

1 stop33h 10m

S$ 1,312

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 22-8

07:00-12:36

2 stops43h 36m

Denver Intl

Sat 29-8

19:45-14:30

2 stops28h 45m

S$ 1,382
Fastest return journey

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 19-12

08:40-12:38

1 stop18h 58m

Denver Intl

Thu 7-1

19:00-07:00

1 stop21h 00m

S$ 1,395

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Mon 17-8

08:45-00:59

1 stop30h 14m

Denver Intl

Fri 4-9

09:45-06:15

2 stops30h 30m

S$ 1,418
Cheapest one-way

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 24-1

23:45-14:30

1 stop29h 45m

S$ 746

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Fri 11-9

22:50-23:08

2 stops38h 18m

S$ 771

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 10-9

01:10-17:32

3 stops54h 22m

S$ 784

Flights are sorted by cheapest return flights first.

Deals found on 29-7

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
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 Singapore to Boulder takes 24 hours 18 minutes. Flights to Boulder from other popular cities in Singapore 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 airlines flying from Singapore to Boulder are United Airlines and Air Canada.

United Airlines
United Airlines
From S$ 1,125
Air Canada
Air Canada
From S$ 1,052

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Singapore to Boulder are Air Canada and 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 30 July 2026.
Read reviews from past customers who have flown United Airlines and Air Canada to the United States. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,046 reviews
Check prices

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

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
10,046 reviews
United Airlines
7.4
Good
10,046 reviews
Check prices

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

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
Air Canada
7.1
Good
11,406 reviews
United Airlines
7.4
Good
10,046 reviews
Check prices

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

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, Air Canada 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 S$ 363, however they can be found for as little as S$ 363.

  • 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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