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 (26 hours 40 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).

R18 285+ Flights to Boulder - Compare & Save Big

Flights to Boulder in 2025

Return from	R18 303
One-way from	R57 530
Popular in	August
Cheapest in	October
Average price	R19 400

14/5-17/5
2 total stops
58h 00m total
Johannesburg to Denver

Search Deals

Cathay Pacific
15/9
2 total stops
43h 07m total
Johannesburg to Boulder

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (R39 927 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (R7 067 potential savings vs. average return price).

Search Deals

Average for return flights in May 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 1 May 2025.

Sun 4/520:40JNB - DEN

2 stops30h 35mVirgin Atlantic

Thu 20/1112:20DEN - JNB

2 stops38h 10mVirgin Atlantic

Deal found 30/4R18 285

Wed 14/521:15JNB - DEN

1 stop27h 10mMultiple Airlines

Sat 17/518:35DEN - JNB

1 stop30h 50mMultiple Airlines

Deal found 30/4R18 303

Sat 14/619:25JNB - DEN

1 stop29h 00mBritish Airways

Sat 21/616:51DEN - JNB

2 stops32h 34mBritish Airways

Deal found 30/4R18 954

Sat 14/621:15JNB - DEN

2 stops30h 46mAmerican Airlines

Sat 21/616:51DEN - JNB

2 stops30h 09mAmerican Airlines

Deal found 30/4R19 158

Sun 2/1119:45JNB - DEN

2 stops31h 17mAir France

Sun 16/1112:20DEN - JNB

2 stops35h 55mAir France

Deal found 30/4R19 288

Sat 1/111:15JNB - DEN

2 stops54h 31mKenya Airways

Sun 16/1123:59DEN - JNB

2 stops49h 56mKenya Airways

Deal found 30/4R20 106

Wed 7/518:50JNB - DEN

1 stop28h 40mDelta

Thu 22/510:31DEN - JNB

2 stops26h 49mDelta

Deal found 30/4R21 983

Sun 4/521:20JNB - DEN

2 stops32h 44mUnited Airlines

Thu 20/1113:45DEN - JNB

1 stop19h 50mUnited Airlines

Deal found 30/4R24 008

Wed 7/522:50JNB - DEN

3 stops47h 57mEthiopian Air

Thu 22/513:55DEN - JNB

2 stops39h 10mEthiopian Air

Deal found 30/4R35 380

Sat 28/617:50JNB - DEN

1 stop32h 05mTurkish Airlines

Sat 19/719:50DEN - JNB

1 stop30h 45mTurkish Airlines

Deal found 30/4R40 007

Tue 6/513:45JNB - DEN

3 stops36h 53mSingapore Airlines

Tue 2/127:58DEN - JNB

2 stops61h 12mSingapore Airlines

Deal found 30/4R47 533

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 1 May 2025.

Wed 14/521:15JNB - DEN

1 stop27h 10mMultiple Airlines

Sat 17/518:35DEN - JNB

1 stop30h 50mMultiple Airlines

Deal found 30/4R18 303

Sat 14/619:25JNB - DEN

1 stop29h 00mBritish Airways

Sat 21/616:51DEN - JNB

2 stops32h 34mBritish Airways

Deal found 30/4R18 954

Sat 14/621:15JNB - DEN

2 stops30h 46mAmerican Airlines

Sat 21/616:51DEN - JNB

2 stops30h 09mAmerican Airlines

Deal found 30/4R19 158

Sat 10/523:15JNB - DEN

2 stops29h 57mDelta

Sat 24/510:31DEN - JNB

2 stops26h 49mDelta

Deal found 30/4R20 217

Tue 19/81:15JNB - DEN

2 stops49h 23mKenya Airways

Wed 27/823:59DEN - JNB

2 stops40h 16mKenya Airways

Deal found 30/4R24 751

Wed 20/822:50JNB - DEN

3 stops47h 34mEthiopian Air

Wed 27/813:52DEN - JNB

3 stops30h 03mEthiopian Air

Deal found 30/4R38 855

Sat 28/617:50JNB - DEN

1 stop32h 05mTurkish Airlines

Sat 19/719:50DEN - JNB

1 stop30h 45mTurkish Airlines

Deal found 30/4R40 007

Sat 28/619:00JNB - DEN

1 stop26h 25mUnited Airlines

Sat 19/720:57DEN - JNB

2 stops36h 48mUnited Airlines

Deal found 30/4R40 750

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated 1 May 2025 and is based on user searches.

Fri 2/521:15JNB - DEN

1 stop27h 10mBritish Airways

Thu 20/1114:49DEN - JNB

2 stops31h 41mBritish Airways

Deal found 30/4R19 493

Fri 2/512:10JNB - DEN

2 stops39h 43mKenya Airways

Thu 20/1123:59DEN - JNB

2 stops49h 56mKenya Airways

Deal found 30/4R21 072

Sun 4/520:40JNB - DEN

2 stops30h 35mVirgin Atlantic

Thu 20/1112:20DEN - JNB

2 stops38h 10mVirgin Atlantic

Deal found 30/4R18 285

Sun 4/521:20JNB - DEN

2 stops32h 44mUnited Airlines

Thu 20/1113:45DEN - JNB

1 stop19h 50mUnited Airlines

Deal found 30/4R24 008

Mon 5/520:40JNB - DEN

2 stops35h 00mVirgin Atlantic

Thu 20/1112:20DEN - JNB

2 stops38h 10mVirgin Atlantic

Deal found 30/4R18 285

Mon 5/518:50JNB - DEN

1 stop28h 40mAir France

Thu 20/1112:20DEN - JNB

2 stops35h 55mAir France

Deal found 30/4R19 511

Mon 5/521:15JNB - DEN

1 stop27h 10mBritish Airways

Thu 20/1117:30DEN - JNB

1 stop29h 00mBritish Airways

Deal found 30/4R19 808

Tue 6/521:15JNB - DEN

1 stop27h 10mMultiple Airlines

Tue 2/1217:30DEN - JNB

1 stop31h 50mMultiple Airlines

Deal found 30/4R19 771

Tue 6/513:45JNB - DEN

3 stops36h 53mSingapore Airlines

Tue 2/127:58DEN - JNB

2 stops61h 12mSingapore Airlines

Deal found 30/4R47 533

Wed 7/518:50JNB - DEN

1 stop28h 40mDelta

Thu 22/510:31DEN - JNB

2 stops26h 49mDelta

Deal found 30/4R21 983

Wed 7/521:20JNB - DEN

1 stop23h 23mUnited Airlines

Thu 22/512:25DEN - JNB

1 stop21h 20mUnited Airlines

Deal found 30/4R26 052

Wed 7/522:50JNB - DEN

3 stops47h 57mEthiopian Air

Thu 22/513:55DEN - JNB

2 stops39h 10mEthiopian Air

Deal found 30/4R35 380

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 1 May 2025.

Mon 15/911:20JNB - DEN

2 stops43h 07mCathay Pacific

Deal found 30/4R57 530

Sun 14/91:15JNB - DEN

2 stops49h 07mKenya Airways

Deal found 30/4R59 444

Mon 15/99:50JNB - DEN

3 stops37h 40mMultiple Airlines

Deal found 30/4R60 206

Mon 15/921:15JNB - DEN

1 stop27h 10mBritish Airways

Deal found 30/4R68 252

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

Wed 14/5

21:15-16:25

1 stop27h 10m

Denver Intl

Sat 17/5

18:35-9:25

1 stop30h 50m

R18 303

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 14/6

19:25-16:25

1 stop29h 00m

Denver Intl

Sat 21/6

16:51-9:25

2 stops32h 34m

R18 954

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 14/6

21:15-20:01

2 stops30h 46m

Denver Intl

Sat 21/6

16:51-7:00

2 stops30h 09m

R19 158

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 19/8

1:15-18:38

2 stops49h 23m

Denver Intl

Wed 27/8

23:59-0:15

2 stops40h 16m

R24 751

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 14/5

21:55-12:42

1 stop22h 47m

Denver Intl

Fri 16/5

0:59-19:40

1 stop34h 41m

R32 834

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 20/8

22:50-14:24

3 stops47h 34m

Denver Intl

Wed 27/8

13:52-3:55

3 stops30h 03m

R38 855

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 28/6

17:50-17:55

1 stop32h 05m

Denver Intl

Sat 19/7

19:50-10:35

1 stop30h 45m

R40 007

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 28/6

19:00-13:25

1 stop26h 25m

Denver Intl

Sat 19/7

20:57-17:45

2 stops36h 48m

R40 750

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 15/9

11:20-22:27

2 stops43h 07m

R57 530

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 14/9

1:15-18:22

2 stops49h 07m

R59 444

Flights are sorted by cheapest return flights first.

Deals found on 30/4

Showing 1-10 of 12 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 89 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 27 hours 10 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 United Airlines, British Airways and Air France.

United Airlines

From R925

British Airways

From R953

Air France

From R926

Kenya Airways

From R1 020

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 Delta, Cathay Pacific and United Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8,0

Very Good

7 934 reviews

Check prices

Reviews

1 / 20

10,0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8,0

Very Good

7 934 reviews

Delta

8,0

Very Good

7 934 reviews

Check prices

Reviews

1 / 20

10,0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Cathay Pacific

7,5

Good

855 reviews

Delta

8,0

Very Good

7 934 reviews

Check prices

Reviews

1 / 20

10,0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines

7,4

Good

8 696 reviews

Delta

8,0

Very Good

7 934 reviews

Check prices

Reviews

1 / 20

10,0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Turkish Airlines

7,3

Good

3 790 reviews

Delta

8,0

Very Good

7 934 reviews

Check prices

Reviews

1 / 20

10,0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

American Airlines

7,2

Good

10 000 reviews

Delta

8,0

Very Good

7 934 reviews

Check prices

Reviews

1 / 20

10,0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 (26 hours 40 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

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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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R18 285+ Cheap flights to Boulder

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/5. 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 594 507 searches and data was last updated on 1 May 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 1 May 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 1 May 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 1 May 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 25 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

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 1 May 2025.

Read through reviews of airlines servicing Boulder, such as Delta, Cathay Pacific and United Airlines. 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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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 1 May 2025.