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S$ 656+ 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 27-6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
17 Jul — 24 Jul1
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 17 June 2026.

Tue 7-707:00
SIN
-
DEN
1 stop24h 13m
Air Canada
Tue 14-719:45
DEN
-
SIN
1 stop19h 30m
Air Canada
Deal found 12-6S$ 1,112
Mon 12-1022:50
SIN
-
DEN
2 stops32h 08m
Air Canada
Wed 28-1019:00
DEN
-
SIN
1 stop22h 00m
Air Canada
Deal found 12-6S$ 1,121
Thu 10-907:00
SIN
-
DEN
1 stop23h 58m
Air Canada
Wed 23-919:50
DEN
-
SIN
2 stops25h 25m
Air Canada
Deal found 14-6S$ 1,185
Wed 16-908:10
SIN
-
DEN
2 stops22h 48m
Multiple Airlines
Wed 23-919:50
DEN
-
SIN
2 stops25h 25m
Multiple Airlines
Deal found 12-6S$ 1,189
Sat 20-607:00
SIN
-
DEN
2 stops39h 45m
Air Canada
Sun 5-707:51
DEN
-
SIN
1 stop31h 24m
Air Canada
Deal found 16-6S$ 1,228
Mon 12-1023:25
SIN
-
DEN
2 stops37h 43m
Multiple Airlines
Wed 28-1011:21
DEN
-
SIN
2 stops29h 39m
Multiple Airlines
Deal found 12-6S$ 1,239

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 17 June 2026.

Return from

S$ 1,112

One-way from

S$ 656

Popular in

July

Cheapest in

February

Average price

S$ 1,363
Air Canada
  • Air Canada
  • 7-7-14-7
  • 2 total stops
  • 43h 43m total
  • Singapore to Denver
Search Deals
Air Canada
  • Air Canada
  • 27-6
  • 2 total stops
  • 39h 30m total
  • Singapore to Boulder
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (S$ 182 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (S$ 85 potential savings vs. average return price).
Search Deals
Average for return flights in June 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 17 June 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

Wed 14-10

22:50-16:58

2 stops32h 08m

Denver Intl

Wed 28-10

19:00-07:00

1 stop22h 00m

S$ 1,121
Fastest return journey

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 7-7

07:00-17:13

1 stop24h 13m

Denver Intl

Tue 14-7

19:45-05:15

1 stop19h 30m

S$ 1,148

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Wed 16-9

08:10-16:58

2 stops22h 48m

Denver Intl

Wed 23-9

19:50-11:15

2 stops25h 25m

S$ 1,189

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 21-7

15:20-20:10

2 stops42h 50m

Denver Intl

Tue 6-10

07:05-11:55

2 stops38h 50m

S$ 1,421

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 21-7

07:00-17:13

1 stop24h 13m

Denver Intl

Tue 6-10

11:21-05:15

2 stops27h 54m

S$ 1,422
Cheapest one-way

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 28-6

07:00-08:30

2 stops39h 30m

S$ 656
Fastest single journey

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 25-6

07:00-14:50

1 stop21h 50m

S$ 758

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Wed 24-6

07:20-19:46

3 stops26h 26m

S$ 932

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 23-6

20:05-19:46

3 stops37h 41m

S$ 933

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 1-12

01:10-20:30

3 stops34h 20m

S$ 959

Flights are sorted by cheapest return flights first.

Deals found on 14-6

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 23 hours 19 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$ 1,117
Air Canada
Air Canada
From S$ 1,044

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 17 June 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
9,845 reviews
Check prices

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,845 reviews
United Airlines
7.4
Good
9,845 reviews
Check prices

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Air Canada
7.1
Good
11,200 reviews
United Airlines
7.4
Good
9,845 reviews
Check prices

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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$ 396, 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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