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S$ 743+ 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 31-5. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
28 May — 4 Jun1
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 28 April 2026.

Tue 8-920:35
SIN
-
DEN
2 stops33h 45m
United Airlines
Tue 22-905:00
DEN
-
SIN
1 stop23h 35m
United Airlines
Deal found 24-4S$ 1,309
Sat 19-1213:15
SIN
-
DEN
2 stops25h 33m
Multiple Airlines
Thu 7-117:00
DEN
-
SIN
2 stops28h 05m
Multiple Airlines
Deal found 28-4S$ 1,403
Wed 7-1006:15
SIN
-
DEN
1 stop19h 50m
United Airlines
Tue 20-1011:45
DEN
-
SIN
2 stops28h 30m
United Airlines
Deal found 24-4S$ 1,413
Thu 15-1014:00
SIN
-
DEN
2 stops23h 48m
STARLUX Airlines
Tue 27-1017:00
DEN
-
SIN
2 stops30h 25m
STARLUX Airlines
Deal found 24-4S$ 1,421
Tue 8-915:20
SIN
-
DEN
2 stops33h 45m
Multiple Airlines
Tue 22-919:28
DEN
-
SIN
2 stops28h 27m
Multiple Airlines
Deal found 24-4S$ 1,426
Tue 19-513:45
SIN
-
DEN
2 stops34h 19m
Multiple Airlines
Mon 22-612:32
DEN
-
SIN
2 stops34h 03m
Multiple Airlines
Deal found 28-4S$ 1,440
Thu 17-908:45
SIN
-
DEN
1 stop21h 55m
United Airlines
Mon 21-909:52
DEN
-
SIN
2 stops30h 23m
United Airlines
Deal found 23-4S$ 1,446
Wed 23-915:20
SIN
-
DEN
2 stops33h 45m
Multiple Airlines
Tue 6-1017:00
DEN
-
SIN
2 stops28h 55m
Multiple Airlines
Deal found 24-4S$ 1,452
Mon 13-714:00
SIN
-
DEN
2 stops22h 45m
STARLUX Airlines
Sat 19-919:28
DEN
-
SIN
2 stops27h 12m
STARLUX Airlines
Deal found 23-4S$ 1,465

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 28 April 2026.

Return from

S$ 1,309

One-way from

S$ 743

Popular in

July

Cheapest in

February

Average price

S$ 1,419
United Airlines
  • United Airlines
  • 8-9-22-9
  • 3 total stops
  • 57h 20m total
  • Singapore to Denver
Search Deals
31-5
  • 31-5
  • 3 total stops
  • 37h 44m total
  • Singapore to Boulder
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (S$ 225 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (S$ 79 potential savings vs. average return price).
Search Deals
Average for return flights in April 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 28 April 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 7-10

08:45-21:13

2 stops26h 28m

Denver Intl

Tue 20-10

05:00-06:40

2 stops35h 40m

S$ 1,417

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 17-9

20:35-08:40

1 stop26h 05m

Denver Intl

Mon 21-9

13:29-06:15

2 stops26h 46m

S$ 1,446

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Mon 13-7

14:00-22:45

2 stops22h 45m

Denver Intl

Sat 19-9

19:28-12:40

2 stops27h 12m

S$ 1,465

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 22-8

21:50-11:09

2 stops27h 19m

Denver Intl

Sun 30-8

06:25-00:20

2 stops27h 55m

S$ 1,496
Fastest return journey

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 11-6

13:10-22:55

2 stops23h 45m

Denver Intl

Fri 24-7

21:08-11:55

2 stops24h 47m

S$ 1,600

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Wed 16-9

01:55-16:32

2 stops28h 37m

Denver Intl

Mon 21-9

07:20-00:20

2 stops27h 00m

S$ 1,604

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 15-10

20:35-08:40

1 stop26h 05m

Denver Intl

Tue 27-10

07:45-20:15

1 stop22h 30m

S$ 1,613
Cheapest one-way

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 31-5

10:20-10:04

3 stops37h 44m

S$ 743

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Mon 8-6

02:40-10:02

2 stops45h 22m

S$ 863

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Wed 17-6

13:25-18:26

3 stops43h 01m

S$ 931

Flights are sorted by cheapest return flights first.

Deals found on 27-4

Showing 1-10 of 16 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 30 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$ 1,110
Air Canada
Air Canada
From S$ 1,038

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 28 April 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
9,672 reviews
Check prices

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,672 reviews
United Airlines
7.4
Good
9,672 reviews
Check prices

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Air Canada
7.1
Good
10,975 reviews
United Airlines
7.4
Good
9,672 reviews
Check prices

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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$ 393, however they can be found for as little as S$ 356.

  • 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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