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S$ 706+ 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 18-5. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
19 May — 26 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 19 April 2026.

Tue 9-620:35
SIN
-
DEN
2 stops26h 08m
United Airlines
Tue 11-813:25
DEN
-
SIN
1 stop26h 50m
United Airlines
Deal found 17-4S$ 1,309
Thu 24-906:15
SIN
-
DEN
1 stop19h 50m
United Airlines
Mon 28-911:24
DEN
-
SIN
2 stops28h 51m
United Airlines
Deal found 15-4S$ 1,414
Tue 2-613:10
SIN
-
DEN
2 stops36h 14m
Multiple Airlines
Thu 9-708:40
DEN
-
SIN
2 stops37h 15m
Multiple Airlines
Deal found 16-4S$ 1,447
Mon 26-1008:15
SIN
-
DEN
2 stops26h 17m
Japan Airlines
Fri 30-1006:43
DEN
-
SIN
2 stops33h 52m
Japan Airlines
Deal found 17-4S$ 1,514
Sat 19-913:45
SIN
-
DEN
2 stops35h 20m
Multiple Airlines
Sat 26-919:28
DEN
-
SIN
2 stops27h 07m
Multiple Airlines
Deal found 15-4S$ 1,521
Tue 2-620:35
SIN
-
DEN
2 stops32h 16m
United Airlines
Thu 9-705:15
DEN
-
SIN
1 stop23h 20m
United Airlines
Deal found 16-4S$ 1,528
Mon 9-1102:00
SIN
-
DEN
2 stops52h 16m
China Airlines
Sun 13-1207:00
DEN
-
SIN
2 stops39h 05m
China Airlines
Deal found 15-4S$ 1,531

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 19 April 2026.

Return from

S$ 1,309

One-way from

S$ 706

Popular in

July

Cheapest in

February

Average price

S$ 1,414
United Airlines
  • United Airlines
  • 9-6-11-8
  • 3 total stops
  • 52h 58m total
  • Singapore to Denver
Search Deals
18-5
  • 18-5
  • 2 total stops
  • 54h 37m total
  • Singapore to Boulder
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (S$ 229 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (S$ 78 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 19 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

Thu 24-9

08:45-19:30

2 stops24h 45m

Denver Intl

Mon 28-9

05:15-06:40

2 stops35h 25m

S$ 1,418
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$ 1,583

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 16-6

22:00-23:45

2 stops39h 45m

Denver Intl

Tue 7-7

18:39-23:55

2 stops39h 16m

S$ 1,592

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Wed 24-6

08:45-23:43

1 stop28h 58m

Denver Intl

Mon 13-7

19:20-18:35

2 stops33h 15m

S$ 1,749

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Mon 22-6

11:05-23:38

2 stops26h 33m

Denver Intl

Mon 13-7

05:15-18:35

1 stop23h 20m

S$ 1,766
Cheapest one-way

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 16-6

11:05-23:36

2 stops26h 31m

S$ 842

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Tue 16-6

23:40-13:30

1 stop27h 50m

S$ 963

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Fri 24-4

19:00-10:54

2 stops53h 54m

S$ 1,001

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Fri 24-4

01:30-21:49

2 stops34h 19m

S$ 1,005

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Wed 22-4

01:30-23:04

2 stops35h 34m

S$ 1,126

Flights are sorted by cheapest return flights first.

Deals found on 14-4

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$ 1,106
Air Canada
Air Canada
From S$ 1,034

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 19 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
9,605 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

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
9,605 reviews
United Airlines
7.4
Good
9,605 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

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
10,939 reviews
United Airlines
7.4
Good
9,605 reviews
Check prices

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

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$ 392, however they can be found for as little as S$ 355.

  • 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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