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$ 443, however they can be found for as little as S$ 116.

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).

S$ 645+ Flights to Boulder

Flights to Boulder in 2025

Return from	S$ 1,355
One-way from	S$ 724
Popular in	January
Cheapest in	February
Average price	S$ 1,376

United Airlines
5-5-11-5
3 total stops
52h 39m total
Singapore to Denver

Search Deals

5-6
2 total stops
32h 33m total
Singapore to Boulder

Search Deals

Highest demand for flights based on searches. 8% potential increase in price (S$ 191 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (S$ 57 potential savings vs. average return price).

Search Deals

Average for return flights in April 2025

Search Deals

Find flight deals to Boulder

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 16 April 2025.

Sun 21-909:10SIN - DEN

1 stop21h 23mAir Canada

Thu 25-911:35DEN - SIN

1 stop29h 30mAir Canada

Deal found 14-4S$ 1,080

Sat 20-901:50SIN - DEN

2 stops33h 33mMultiple Airlines

Thu 25-919:05DEN - SIN

1 stop22h 00mMultiple Airlines

Deal found 14-4S$ 1,117

Sun 18-509:00SIN - DEN

1 stop19h 59mUnited Airlines

Wed 28-508:02DEN - SIN

1 stop20h 23mUnited Airlines

Deal found 14-4S$ 1,491

Sat 28-601:55SIN - DEN

2 stops35h 14mJapan Airlines

Sun 20-706:00DEN - SIN

2 stops34h 10mJapan Airlines

Deal found 14-4S$ 1,493

Sun 18-523:30SIN - DEN

2 stops34h 25mSWISS

Wed 28-517:50DEN - SIN

2 stops38h 05mSWISS

Deal found 14-4S$ 1,654

Sat 17-501:10SIN - DEN

2 stops31h 09mDelta

Wed 28-518:45DEN - SIN

2 stops38h 55mDelta

Deal found 15-4S$ 2,136

Sat 28-600:05SIN - DEN

1 stop32h 30mLufthansa

Sun 20-716:15DEN - SIN

1 stop34h 25mLufthansa

Deal found 14-4S$ 2,352

Sat 20-902:00SIN - DEN

3 stops50h 43mEthiopian Air

Thu 25-913:52DEN - SIN

3 stops34h 58mEthiopian Air

Deal found 14-4S$ 3,035

Sat 17-501:55SIN - DEN

2 stops23h 07mAmerican Airlines

Wed 28-518:35DEN - SIN

1 stop31h 30mAmerican Airlines

Deal found 14-4S$ 4,914

Thu 6-1119:45SIN - DEN

2 stops54h 54mPhilippine Airlines

Sat 22-1119:19DEN - SIN

2 stops27h 21mPhilippine Airlines

Deal found 15-4S$ 5,983

Wed 5-1123:25SIN - DEN

1 stop33h 15mTurkish Airlines

Sat 22-1119:35DEN - SIN

1 stop31h 00mTurkish Airlines

Deal found 15-4S$ 6,417

Tue 4-1101:30SIN - DEN

2 stops31h 39mKorean Air

Sat 22-1106:30DEN - SIN

2 stops55h 30mKorean Air

Deal found 15-4S$ 7,167

Best flights to Boulder
Discover carefully curated flight deals to Boulder that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 April 2025.

Mon 5-509:00SIN - DEN

1 stop19h 59mUnited Airlines

Sun 11-519:45DEN - SIN

2 stops32h 40mUnited Airlines

Deal found 15-4S$ 1,355

Sat 17-501:55SIN - DEN

2 stops31h 54mJapan Airlines

Wed 28-520:20DEN - SIN

2 stops31h 10mJapan Airlines

Deal found 14-4S$ 1,631

Sun 18-523:30SIN - DEN

2 stops34h 25mSWISS

Wed 28-517:50DEN - SIN

2 stops40h 45mSWISS

Deal found 15-4S$ 1,654

Sun 4-501:10SIN - DEN

2 stops31h 51mDelta

Sun 11-519:17DEN - SIN

2 stops43h 43mDelta

Deal found 15-4S$ 1,676

Sun 18-520:45SIN - DEN

2 stops34h 42mMultiple Airlines

Wed 28-512:15DEN - SIN

3 stops33h 30mMultiple Airlines

Deal found 14-4S$ 1,784

Fri 30-508:05SIN - DEN

2 stops26h 11mAmerican Airlines

Fri 6-607:20DEN - SIN

2 stops27h 00mAmerican Airlines

Deal found 15-4S$ 2,044

Thu 29-501:45SIN - DEN

2 stops31h 38mAir Canada

Fri 6-619:15DEN - SIN

1 stop21h 50mAir Canada

Deal found 15-4S$ 2,178

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated 16 April 2025 and is based on user searches.

Fri 16-502:15SIN - DEN

2 stops47h 12mMultiple Airlines

Sun 25-519:15DEN - SIN

1 stop21h 50mMultiple Airlines

Deal found 13-4S$ 1,717

Fri 16-500:05SIN - DEN

1 stop32h 35mLufthansa

Sun 25-515:50DEN - SIN

1 stop34h 35mLufthansa

Deal found 13-4S$ 2,986

Sat 17-501:55SIN - DEN

2 stops31h 54mJapan Airlines

Wed 28-520:20DEN - SIN

2 stops31h 10mJapan Airlines

Deal found 14-4S$ 1,631

Sat 17-501:10SIN - DEN

2 stops31h 09mDelta

Wed 28-518:45DEN - SIN

2 stops38h 55mDelta

Deal found 15-4S$ 2,136

Sat 17-501:55SIN - DEN

2 stops23h 07mAmerican Airlines

Wed 28-518:35DEN - SIN

1 stop31h 30mAmerican Airlines

Deal found 14-4S$ 4,914

Sun 18-509:00SIN - DEN

1 stop19h 59mUnited Airlines

Wed 28-508:02DEN - SIN

1 stop20h 23mUnited Airlines

Deal found 14-4S$ 1,491

Sun 18-523:30SIN - DEN

2 stops34h 25mSWISS

Wed 28-517:50DEN - SIN

2 stops40h 45mSWISS

Deal found 15-4S$ 1,654

Thu 29-509:10SIN - DEN

1 stop21h 28mAir Canada

Thu 5-619:15DEN - SIN

1 stop21h 50mAir Canada

Deal found 14-4S$ 1,192

One-way flights to Boulder
Search for one-way flight options to Boulder. Find affordable one-way fares based on user searches. Data last updated 16 April 2025.

Thu 5-615:15SIN - DEN

2 stops32h 33mMultiple Airlines

Deal found 15-4S$ 724

Wed 28-514:00SIN - DEN

2 stops24h 05mSTARLUX Airlines

Deal found 15-4S$ 870

Sat 14-609:10SIN - DEN

2 stops37h 33mAir Canada

Deal found 15-4S$ 881

Tue 27-501:10SIN - DEN

2 stops32h 48mDelta

Deal found 15-4S$ 965

Fri 6-610:15SIN - DEN

1 stop45h 40mTurkish Airlines

Deal found 15-4S$ 1,088

Tue 27-502:00SIN - DEN

3 stops50h 32mEthiopian Air

Deal found 15-4S$ 2,324

Wed 4-600:05SIN - DEN

1 stop32h 30mLufthansa

Deal found 15-4S$ 3,040

Thu 5-601:25SIN - DEN

1 stop28h 55mSWISS

Deal found 15-4S$ 3,270

Mon 5-523:20SIN - DEN

1 stop31h 05mBritish Airways

Deal found 15-4S$ 3,981

Cheapflights Fare Finder

Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Route

Depart

Return

Price

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 21-9

09:10-16:33

1 stop21h 23m

Denver Intl

Thu 25-9

11:35-07:05

1 stop29h 30m

S$ 1,080

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 20-9

01:50-21:23

2 stops33h 33m

Denver Intl

Thu 25-9

19:05-07:05

1 stop22h 00m

S$ 1,117

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 18-5

09:00-14:59

1 stop19h 59m

Denver Intl

Wed 28-5

08:02-18:25

1 stop20h 23m

S$ 1,491

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 28-6

01:55-23:09

2 stops35h 14m

Denver Intl

Sun 20-7

06:00-06:10

2 stops34h 10m

S$ 1,493

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sun 18-5

23:30-19:55

2 stops34h 25m

Denver Intl

Wed 28-5

17:50-00:35

2 stops40h 45m

S$ 1,654

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 17-5

01:10-18:19

2 stops31h 09m

Denver Intl

Wed 28-5

18:45-23:40

2 stops38h 55m

S$ 2,136

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 28-6

00:05-18:35

1 stop32h 30m

Denver Intl

Sun 20-7

16:15-16:40

1 stop34h 25m

S$ 2,352

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 20-9

02:00-14:43

3 stops50h 43m

Denver Intl

Thu 25-9

13:52-14:50

3 stops34h 58m

S$ 3,035

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Sat 17-5

01:55-11:02

2 stops23h 07m

Denver Intl

Wed 28-5

18:35-16:05

1 stop31h 30m

S$ 4,914

SingaporeDenver

SIN - DEN

SINDEN

Singapore Changi

Thu 29-5

09:10-19:23

1 stop24h 13m

S$ 645

Flights are sorted by cheapest return flights first.

Deals found on 14-4

Showing 1-10 of 18 results

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

When is the best time to book a flight to Boulder?

To ensure you get the cheapest price possible for a flight to Boulder, you should look to book at least 39 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

How long is the flight to Boulder?

On average, a flight from Singapore to Boulder takes 19 hours 59 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, Japan Airlines and Air Canada.

United Airlines

From S$ 934

Japan Airlines

From S$ 1,086

Air Canada

From S$ 984

ANA

From S$ 986

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Singapore to Boulder are United Airlines, Air Canada and ANA.

Rainfall in Boulder 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

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

STARLUX Airlines

9.1

Wonderful

Check prices

Reviews

1 / 5

10.0

Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

STARLUX Airlines

9.1

Wonderful

STARLUX Airlines

9.1

Wonderful

Check prices

Reviews

1 / 5

10.0

Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Japan Airlines

8.3

Very Good

1,440 reviews

STARLUX Airlines

9.1

Wonderful

Check prices

Reviews

1 / 5

10.0

Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Delta

8.0

Very Good

7,918 reviews

STARLUX Airlines

9.1

Wonderful

Check prices

Reviews

1 / 5

10.0

Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

SWISS

7.5

Good

1,580 reviews

STARLUX Airlines

9.1

Wonderful

Check prices

Reviews

1 / 5

10.0

Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

United Airlines

7.4

Good

8,658 reviews

STARLUX Airlines

9.1

Wonderful

Check prices

Reviews

1 / 5

10.0

Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

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$ 443, however they can be found for as little as S$ 116.
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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How does Cheapflights help users find flights to Boulder?

Cheapflights makes it easy to find Boulder flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets to Boulder?

Cheapflights simply makes it quick and affordable to book flights to Boulder by bringing together all flight options from hundreds of airlines and agencies online — and we put them in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights to Boulder with no change fees?

Yes! Cheapflights helps users easily find flights to Boulder with no change fees.

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S$ 645+ 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 29-5. Fares are subject to change and may not be available on all flights or dates of travel.

Flights to Boulder in 2025

Find the latest flights to Boulder in 2025, 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 16 April 2025.

Return from

One-way from

Popular in

Cheapest in

Average price

Find flight deals to Boulder

Cheapest flights to BoulderExplore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on 16 April 2025.

Explore the most affordable flight options available to Boulder. Find the lowest fares based on data from user searches, with prices last updated on 16 April 2025.

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 16 April 2025.

Use the filters below to find and compare flights to Boulder that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight to Boulder

When is the best time to book a flight to Boulder?

Use this chart to determine the optimal time to book a return flight from Singapore to Boulder. Price data was last updated on 11 April 2025.

How long is the flight to Boulder?

What are the most popular airlines that fly to Boulder?

What are the cheapest airlines that fly to Boulder?

Rainfall in Boulder by month

Plan your trip to Boulder by taking into account the average rainfall totals by month.

Temperature in Boulder by month

Plan your trip to Boulder by taking into account the average temperature totals by month.

Reviews of airlines servicing Boulder

FAQs about flying to Boulder

Can I find cheaper flights to Boulder if I am willing to have stopovers?

What is the best airline to fly to Boulder?

How much is a return flight to Boulder?

Does Denver Intl have rental cars?

Are there hotels close to Denver Intl?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Search flights to Boulder by cabin class

Find flights to Boulder, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights to Boulder?

Why should you use Cheapflights to find cheap flight tickets to Boulder?

Can Cheapflights find flights to Boulder with no change fees?

Can Cheapflights notify me if prices for flights to Boulder become cheaper?

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Book with Flexibility

Travel Smart

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 16 April 2025.