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S$ 728+ 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 10-10. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
9 Sep — 16 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 10 August 2026.

Sun 23-807:00 -
1 stop30h 52m
Tue 8-909:10 -
1 stop30h 05m
Deal found 6-8S$ 1,140
Thu 13-807:00 -
1 stop30h 52m
Thu 27-819:45 -
1 stop19h 30m
Deal found 8-8S$ 1,154
Thu 24-907:00 -
1 stop30h 08m
Thu 1-1009:40 -
1 stop29h 35m
Deal found 10-8S$ 1,178
Thu 13-807:00 -
1 stop30h 52m
Fri 28-809:10 -
1 stop30h 05m
Deal found 7-8S$ 1,180
Thu 10-907:00 -
1 stop23h 58m
Wed 23-909:10 -
1 stop25h 20m
Deal found 9-8S$ 1,183
Tue 20-1020:50 -
2 stops34h 08m
Mon 26-1008:15 -
2 stops37h 00m
Deal found 6-8S$ 1,205
Tue 22-920:50 -
2 stops40h 18m
Tue 29-909:10 -
1 stop30h 05m
Deal found 6-8S$ 1,211

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 10 August 2026.

Return from

S$ 1,140

One-way from

S$ 728

Popular in

October

Cheapest in

September

Average price

S$ 1,533
Air Canada
  • Air Canada
  • 23-8-8-9
  • 2 total stops
  • 60h 57m total
  • Singapore to Denver
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Air Canada
  • Air Canada
  • 10-10
  • 2 total stops
  • 39h 47m total
  • Singapore to Boulder
Search Deals
Highest demand for flights based on searches. 2% potential increase in price.
Search Deals
Cheapest flight prices on average. 1% potential price decrease (S$ 24 potential savings vs. average return price).
Search Deals
Average for return flights in August 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 200,618 searches and data was last updated on 10 August 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
Fastest return journey

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Sun 20-12

08:40-12:38

1 stop18h 58m

Denver Intl

Fri 8-1

15:43-07:00

1 stop24h 17m

S$ 1,240

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Mon 7-9

07:30-22:55

2 stops29h 25m

Denver Intl

Mon 14-9

13:40-23:55

2 stops44h 15m

S$ 1,269

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Mon 2-11

22:20-19:30

2 stops36h 10m

Denver Intl

Mon 7-12

05:15-20:15

1 stop24h 00m

S$ 1,311

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Sun 23-8

07:00-08:34

2 stops39h 34m

Denver Intl

Tue 8-9

10:05-05:15

2 stops29h 10m

S$ 1,392

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Tue 22-9

07:30-23:47

2 stops30h 17m

Denver Intl

Sat 26-9

19:55-05:00

2 stops43h 05m

S$ 1,421

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Tue 22-9

08:45-15:54

1 stop21h 09m

Denver Intl

Sat 26-9

16:15-06:15

2 stops24h 00m

S$ 1,504
Cheapest one-way

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Fri 5-2

08:40-08:39

2 stops38h 59m

S$ 741
Fastest single journey

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Sun 29-11

08:40-12:38

1 stop18h 58m

S$ 758

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Thu 3-9

07:30-12:04

2 stops42h 34m

S$ 774

SingaporeDenver

SIN Singapore Changi - DEN Denver Intl

SINDEN

Singapore Changi

Wed 2-9

07:30-20:01

2 stops26h 31m

S$ 774

Flights are sorted by cheapest return flights first.

Deals found on 9-8

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 30 hours 5 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 airline flying from Singapore to Boulder is United Airlines.

United Airlines
United Airlines
From S$ 1,113

What are the cheapest airlines that fly to Boulder?

The cheapest airline flying from Singapore 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 10 August 2026.
Read reviews from past customers who have flown United Airlines 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
10,099 reviews
Check prices

Food

6.7

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

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
10,099 reviews
United Airlines
7.4
Good
10,099 reviews
Check prices

Food

6.7

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

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 S$ 359, however they can be found for as little as S$ 359.

  • 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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