What is the cheapest month to fly to Boulder?

Currently, the cheapest month for flights to Boulder is January . The most expensive month for flights is August . The cheapest prices are shown above but prices will vary according to departure times, airlines, class and how early you book.

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, Virgin Atlantic 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 R149, however they can be found for as little as R149.

Where does the fastest flight to Boulder depart from?

For those looking to save time traveling to Boulder, Cape Town Intl offers the quickest one-way flight (24 hours 7 minutes).

Does Denver Intl have car hire?

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).

R12 855+ Flights to Boulder

Flights to Boulder in 2025

Return from	R18 843
One-way from	R12 855
Popular in	August
Cheapest in	October
Average price	R23 128

British Airways
29/7-5/8
3 total stops
60h 30m total
Johannesburg to Denver

Search Deals

Turkish Airlines
19/6
1 total stop
32h 05m total
Johannesburg to Boulder

Search Deals

Highest demand for flights based on searches. 10% potential increase in price (R44 641 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (R6 600 potential savings vs. average return price).

Search Deals

Average for return flights in June 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 15 June 2025.

Tue 29/721:15JNB - DEN

2 stops32h 05mBritish Airways

Tue 5/818:35DEN - JNB

1 stop28h 25mBritish Airways

Deal found 14/6R18 843

Mon 28/721:15JNB - DEN

2 stops30h 45mAmerican Airlines

Mon 4/817:32DEN - JNB

2 stops31h 53mAmerican Airlines

Deal found 13/6R19 058

Fri 31/101:15JNB - DEN

2 stops54h 31mKenya Airways

Wed 12/1123:59DEN - JNB

2 stops30h 51mKenya Airways

Deal found 14/6R19 166

Sun 2/1119:45JNB - DEN

1 stop29h 15mUnited Airlines

Sun 16/1110:20DEN - JNB

2 stops23h 15mUnited Airlines

Deal found 13/6R19 453

Thu 19/617:50JNB - DEN

1 stop32h 05mTurkish Airlines

Sun 6/719:50DEN - JNB

1 stop30h 45mTurkish Airlines

Deal found 13/6R19 865

Mon 23/619:00JNB - DEN

1 stop28h 35mMultiple Airlines

Mon 30/617:50DEN - JNB

1 stop31h 30mMultiple Airlines

Deal found 14/6R20 403

Mon 28/723:15JNB - DEN

2 stops28h 38mDelta

Sun 3/80:59DEN - JNB

1 stop34h 41mDelta

Deal found 13/6R22 214

Sat 1/1122:50JNB - DEN

3 stops46h 08mEthiopian Air

Wed 12/1113:35DEN - JNB

2 stops38h 30mEthiopian Air

Deal found 14/6R25 692

Sun 2/1113:45JNB - DEN

3 stops37h 13mSingapore Airlines

Sun 16/1117:40DEN - JNB

2 stops39h 55mSingapore Airlines

Deal found 14/6R30 891

Mon 14/718:50JNB - DEN

2 stops28h 42mAir France

Tue 15/717:40DEN - JNB

1 stop31h 10mAir France

Deal found 13/6R32 792

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 15 June 2025.

Tue 29/721:15JNB - DEN

2 stops32h 05mBritish Airways

Tue 5/818:35DEN - JNB

1 stop28h 25mBritish Airways

Deal found 14/6R18 843

Mon 28/721:15JNB - DEN

2 stops30h 45mAmerican Airlines

Mon 4/817:32DEN - JNB

2 stops31h 53mAmerican Airlines

Deal found 13/6R19 058

Fri 31/101:15JNB - DEN

2 stops54h 31mKenya Airways

Wed 12/1123:59DEN - JNB

2 stops30h 51mKenya Airways

Deal found 14/6R19 166

Sun 2/1119:45JNB - DEN

1 stop29h 15mUnited Airlines

Sun 16/1110:20DEN - JNB

2 stops23h 15mUnited Airlines

Deal found 13/6R19 453

Sun 6/721:55JNB - DEN

1 stop22h 41mDelta

Mon 14/76:00DEN - JNB

1 stop29h 40mDelta

Deal found 15/6R21 748

Mon 14/712:10JNB - DEN

2 stops38h 55mMultiple Airlines

Tue 15/723:59DEN - JNB

2 stops31h 51mMultiple Airlines

Deal found 13/6R24 849

Sat 1/1122:50JNB - DEN

3 stops46h 08mEthiopian Air

Wed 12/1113:35DEN - JNB

2 stops38h 30mEthiopian Air

Deal found 14/6R25 692

Mon 7/718:50JNB - DEN

1 stop28h 40mAir France

Tue 15/717:40DEN - JNB

1 stop31h 10mAir France

Deal found 15/6R29 027

Wed 9/719:00JNB - DEN

1 stop28h 35mLufthansa

Wed 16/717:59DEN - JNB

1 stop30h 36mLufthansa

Deal found 15/6R29 529

Tue 8/719:35JNB - DEN

1 stop28h 45mSWISS

Fri 18/717:50DEN - JNB

1 stop31h 30mSWISS

Deal found 15/6R30 568

Sun 2/1113:45JNB - DEN

3 stops37h 13mSingapore Airlines

Sun 16/1117:40DEN - JNB

2 stops39h 55mSingapore Airlines

Deal found 14/6R30 891

Tue 8/717:50JNB - DEN

1 stop32h 05mTurkish Airlines

Wed 16/719:50DEN - JNB

1 stop30h 45mTurkish Airlines

Deal found 15/6R42 437

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated 15 June 2025 and is based on user searches.

Thu 19/617:50JNB - DEN

1 stop32h 05mTurkish Airlines

Sun 6/719:50DEN - JNB

1 stop30h 45mTurkish Airlines

Deal found 13/6R19 865

Thu 19/618:50JNB - DEN

1 stop28h 40mDelta

Sun 6/76:05DEN - JNB

2 stops31h 15mDelta

Deal found 13/6R23 182

Thu 19/613:45JNB - DEN

3 stops37h 55mSingapore Airlines

Sun 6/719:25DEN - JNB

2 stops39h 10mSingapore Airlines

Deal found 13/6R56 852

Sun 22/61:25JNB - DEN

2 stops49h 17mKenya Airways

Mon 30/623:59DEN - JNB

2 stops31h 51mKenya Airways

Deal found 14/6R37 937

Mon 23/619:00JNB - DEN

1 stop28h 35mMultiple Airlines

Mon 30/617:50DEN - JNB

1 stop31h 30mMultiple Airlines

Deal found 14/6R20 403

Sat 28/619:00JNB - DEN

1 stop28h 35mUnited Airlines

Sat 19/712:35DEN - JNB

1 stop21h 10mUnited Airlines

Deal found 14/6R34 943

Sat 28/614:30JNB - DEN

3 stops32h 12mEthiopian Air

Sat 19/713:25DEN - JNB

3 stops30h 30mEthiopian Air

Deal found 13/6R52 549

Sun 13/71:25JNB - DEN

2 stops49h 40mKenya Airways

Tue 15/723:59DEN - JNB

2 stops31h 51mKenya Airways

Deal found 13/6R22 572

Mon 14/718:50JNB - DEN

2 stops28h 42mAir France

Tue 15/717:40DEN - JNB

1 stop31h 10mAir France

Deal found 13/6R32 792

Mon 28/721:15JNB - DEN

2 stops30h 45mAmerican Airlines

Mon 4/817:32DEN - JNB

2 stops31h 53mAmerican Airlines

Deal found 13/6R19 058

Mon 28/723:15JNB - DEN

2 stops28h 38mDelta

Sun 3/80:59DEN - JNB

1 stop34h 41mDelta

Deal found 13/6R22 214

Tue 29/721:15JNB - DEN

2 stops32h 05mBritish Airways

Tue 5/818:35DEN - JNB

1 stop28h 25mBritish Airways

Deal found 14/6R18 843

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 15 June 2025.

Thu 19/617:50JNB - DEN

1 stop32h 05mTurkish Airlines

Deal found 14/6R12 855

Mon 14/716:50JNB - DEN

3 stops36h 27mMultiple Airlines

Deal found 13/6R13 733

Mon 14/79:50JNB - DEN

2 stops43h 34mEtihad Airways

Deal found 13/6R13 984

Sat 4/1013:55JNB - DEN

2 stops41h 09mQatar Airways

Deal found 13/6R14 809

Sun 13/71:25JNB - DEN

2 stops29h 24mKenya Airways

Deal found 13/6R15 580

Sat 4/1014:30JNB - DEN

3 stops29h 43mEthiopian Air

Deal found 13/6R23 074

Thu 19/613:45JNB - DEN

3 stops37h 55mSingapore Airlines

Deal found 14/6R35 983

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

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 29/7

21:15-21:20

2 stops32h 05m

Denver Intl

Tue 5/8

18:35-7:00

1 stop28h 25m

R18 843

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 28/7

21:15-20:00

2 stops30h 45m

Denver Intl

Mon 4/8

17:32-9:25

2 stops31h 53m

R19 058

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Fri 31/10

1:15-23:46

2 stops54h 31m

Denver Intl

Wed 12/11

23:59-15:50

2 stops30h 51m

R19 166

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 2/11

19:45-16:00

1 stop29h 15m

Denver Intl

Sun 16/11

10:20-18:35

2 stops23h 15m

R19 453

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 1/11

1:15-23:46

2 stops54h 31m

Denver Intl

Sun 16/11

23:59-15:50

2 stops30h 51m

R21 909

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 28/7

23:15-19:53

2 stops28h 38m

Denver Intl

Sun 3/8

0:59-19:40

1 stop34h 41m

R22 214

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 1/11

22:50-12:58

3 stops46h 08m

Denver Intl

Wed 12/11

13:35-13:05

2 stops38h 30m

R25 692

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 2/11

13:45-17:58

3 stops37h 13m

Denver Intl

Sun 16/11

17:40-18:35

2 stops39h 55m

R30 891

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 14/7

18:50-15:32

2 stops28h 42m

Denver Intl

Tue 15/7

17:40-8:50

1 stop31h 10m

R32 792

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 19/6

17:50-17:55

1 stop32h 05m

R12 855

Flights are sorted by cheapest return flights first.

Deals found on 14/6

Showing 1-10 of 16 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 35 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 Johannesburg to Boulder takes 28 hours 40 minutes. Flights to Boulder from other popular cities in South Africa 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 Johannesburg to Boulder are British Airways, United Airlines and Virgin Atlantic.

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Johannesburg to Boulder are KLM, Turkish Airlines and Delta.

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

Read through reviews of airlines servicing Boulder, such as Singapore Airlines, Delta and Air France. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8,1

Very Good

1 308 reviews

Check prices

Reviews

1 / 20

6,0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Singapore Airlines

8,1

Very Good

1 308 reviews

Singapore Airlines

8,1

Very Good

1 308 reviews

Check prices

Reviews

1 / 20

6,0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Delta

8,0

Very Good

7 961 reviews

Singapore Airlines

8,1

Very Good

1 308 reviews

Check prices

Reviews

1 / 20

6,0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Air France

7,5

Good

1 463 reviews

Singapore Airlines

8,1

Very Good

1 308 reviews

Check prices

Reviews

1 / 20

6,0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

SWISS

7,5

Good

1 627 reviews

Singapore Airlines

8,1

Very Good

1 308 reviews

Check prices

Reviews

1 / 20

6,0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

Qatar Airways

7,4

Good

3 586 reviews

Singapore Airlines

8,1

Very Good

1 308 reviews

Check prices

Reviews

1 / 20

6,0

Good

Pierre,Apr 2025

MLE - SIN

3 boarding pass checkpoints at the gate. Long line before boarding. Poor leg room in economy.. Flight crew rounds practically non existent during flight.

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, Virgin Atlantic 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 R149, however they can be found for as little as R149.
Where does the fastest flight to Boulder depart from?
For those looking to save time traveling to Boulder, Cape Town Intl offers the quickest one-way flight (24 hours 7 minutes).
Does Denver Intl have car hire?
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

Browse thousands of different options on Cheapflights for your next trip

Search flights to Boulder by cabin class

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How does Cheapflights help users find flights to Boulder?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights to Boulder. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Millions of users choose and trust Cheapflights to book the best flight deals to Boulder for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights to Boulder with no change fees?

Need flexible booking options for your flight to Boulder ? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Boulder flights so you can book your flight when prices are ideal. Enable price alerts by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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R12 855+ 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 19/6. 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 594 507 searches and data was last updated on 15 June 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 15 June 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 15 June 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 594 507 searches and data was last updated on 15 June 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 Johannesburg to Boulder. Price data was last updated on 9 June 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

Read through reviews of airlines servicing Boulder, such as Singapore Airlines, Delta and Air France. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

Where does the fastest flight to Boulder depart from?

Does Denver Intl have car hire?

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 15 June 2025.