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 June . 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 R1 783, however they can be found for as little as R1 629.

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 (22 hours 38 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).

R10 045+ Cheap Flights to Boulder

Flights to Boulder in 2025

Return from	R15 601
One-way from	R10 045
Popular in	June
Cheapest in	February
Average price	R17 356

American Airlines
17/11-28/11
2 total stops
60h 55m total
Johannesburg to Denver

Search Deals

25/11
3 total stops
35h 30m total
Johannesburg to Boulder

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (R1 217 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (R313 potential savings vs. average return price).

Search Deals

Average for return flights in October 2025

Search Deals

Find flight deals to Boulder

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 29 October 2025.

Mon 17/1119:35JNB - DEN

1 stop28h 55mAmerican Airlines

Fri 28/1117:25DEN - JNB

1 stop32h 00mAmerican Airlines

Deal found 28/10R15 601

Thu 13/1122:00JNB - DEN

2 stops31h 17mAmerican Airlines

Mon 17/1116:51DEN - JNB

2 stops29h 44mAmerican Airlines

Deal found 28/10R15 739

Mon 10/1122:00JNB - DEN

2 stops31h 17mAmerican Airlines

Thu 13/1116:10DEN - JNB

2 stops30h 25mAmerican Airlines

Deal found 27/10R15 980

Mon 10/1119:05JNB - DEN

1 stop31h 30mTurkish Airlines

Thu 13/1119:20DEN - JNB

1 stop30h 30mTurkish Airlines

Deal found 27/10R16 169

Tue 25/1122:00JNB - DEN

2 stops30h 55mAmerican Airlines

Tue 2/1216:56DEN - JNB

2 stops29h 39mAmerican Airlines

Deal found 28/10R16 410

Tue 25/1110:10JNB - DEN

1 stop41h 45mLufthansa

Tue 2/1220:20DEN - JNB

1 stop25h 45mLufthansa

Deal found 28/10R16 909

Sun 2/1123:59JNB - DEN

2 stops30h 42mDelta

Sun 16/1111:08DEN - JNB

2 stops36h 32mDelta

Deal found 27/10R16 977

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 29 October 2025.

Mon 17/1119:35JNB - DEN

1 stop28h 55mAmerican Airlines

Fri 28/1117:25DEN - JNB

1 stop32h 00mAmerican Airlines

Deal found 28/10R15 601

Mon 10/1119:05JNB - DEN

1 stop31h 30mTurkish Airlines

Thu 13/1119:20DEN - JNB

1 stop30h 30mTurkish Airlines

Deal found 27/10R16 169

Tue 18/1120:15JNB - DEN

2 stops32h 40mMultiple Airlines

Fri 28/1116:20DEN - JNB

1 stop29h 45mMultiple Airlines

Deal found 29/10R16 530

Wed 19/1122:00JNB - DEN

2 stops34h 35mDelta

Fri 28/117:10DEN - JNB

2 stops40h 30mDelta

Deal found 29/10R16 840

Tue 18/1110:10JNB - DEN

1 stop37h 25mLufthansa

Fri 28/1116:20DEN - JNB

1 stop29h 45mLufthansa

Deal found 29/10R16 943

Thu 13/1119:35JNB - DEN

2 stops29h 11mAmerican Airlines

Mon 17/1114:49DEN - JNB

2 stops31h 46mAmerican Airlines

Deal found 26/10R15 825

Sun 16/1122:00JNB - DEN

2 stops30h 31mDelta

Fri 28/1111:49DEN - JNB

2 stops35h 51mDelta

Deal found 29/10R16 840

Mon 10/1122:00JNB - DEN

2 stops31h 17mAmerican Airlines

Thu 13/1116:10DEN - JNB

2 stops30h 25mAmerican Airlines

Deal found 27/10R15 980

Mon 17/1122:00JNB - DEN

2 stops31h 43mDelta

Fri 28/116:15DEN - JNB

2 stops41h 25mDelta

Deal found 29/10R16 840

Tue 18/1122:00JNB - DEN

2 stops28h 45mAmerican Airlines

Fri 28/1116:36DEN - JNB

2 stops32h 49mAmerican Airlines

Deal found 29/10R16 410

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated 29 October 2025 and is based on user searches.

Mon 10/1122:00JNB - DEN

2 stops31h 17mAmerican Airlines

Thu 13/1116:10DEN - JNB

2 stops30h 25mAmerican Airlines

Deal found 27/10R15 980

Mon 10/1119:05JNB - DEN

1 stop31h 30mTurkish Airlines

Thu 13/1119:20DEN - JNB

1 stop30h 30mTurkish Airlines

Deal found 27/10R16 169

Thu 13/1122:00JNB - DEN

2 stops31h 17mAmerican Airlines

Mon 17/1116:51DEN - JNB

2 stops29h 44mAmerican Airlines

Deal found 28/10R15 739

Sun 16/1122:00JNB - DEN

2 stops30h 31mDelta

Fri 28/1111:49DEN - JNB

2 stops35h 51mDelta

Deal found 29/10R16 840

Mon 17/1119:35JNB - DEN

1 stop28h 55mAmerican Airlines

Fri 28/1117:25DEN - JNB

1 stop32h 00mAmerican Airlines

Deal found 28/10R15 601

Tue 18/1120:15JNB - DEN

2 stops32h 40mMultiple Airlines

Fri 28/1116:20DEN - JNB

1 stop29h 45mMultiple Airlines

Deal found 29/10R16 530

Tue 25/1119:35JNB - DEN

2 stops31h 17mAmerican Airlines

Tue 2/1212:27DEN - JNB

2 stops34h 08mAmerican Airlines

Deal found 28/10R16 410

Tue 25/1110:10JNB - DEN

1 stop41h 45mLufthansa

Tue 2/1220:20DEN - JNB

1 stop25h 45mLufthansa

Deal found 28/10R16 909

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 29 October 2025.

Tue 25/1123:00JNB - DEN

3 stops35h 30mMultiple Airlines

Deal found 28/10R10 045

Tue 25/1122:00JNB - DEN

1 stop26h 30mAmerican Airlines

Deal found 28/10R15 085

Mon 24/111:35JNB - DEN

2 stops50h 12mKenya Airways

Deal found 28/10R16 410

Fly from

Route

Depart

Return

Price

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 17/11

19:35-15:30

1 stop28h 55m

Denver Intl

Fri 28/11

17:25-10:25

1 stop32h 00m

R15 601

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 13/11

19:35-15:46

2 stops29h 11m

Denver Intl

Mon 17/11

14:49-7:35

2 stops31h 46m

R15 825

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 10/11

22:00-20:17

2 stops31h 17m

Denver Intl

Thu 13/11

16:10-7:35

2 stops30h 25m

R15 980

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 10/11

19:05-17:35

1 stop31h 30m

Denver Intl

Thu 13/11

19:20-10:50

1 stop30h 30m

R16 169

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 18/11

22:00-17:45

2 stops28h 45m

Denver Intl

Fri 28/11

16:36-10:25

2 stops32h 49m

R16 410

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 18/11

20:15-19:55

2 stops32h 40m

Denver Intl

Fri 28/11

16:20-7:05

1 stop29h 45m

R16 530

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 19/11

22:00-23:35

2 stops34h 35m

Denver Intl

Fri 28/11

7:10-8:40

2 stops40h 30m

R16 840

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 16/11

22:00-19:31

2 stops30h 31m

Denver Intl

Fri 28/11

11:49-8:40

2 stops35h 51m

R16 840

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 17/11

22:00-20:43

2 stops31h 43m

Denver Intl

Fri 28/11

6:15-8:40

2 stops41h 25m

R16 840

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 18/11

10:10-14:35

1 stop37h 25m

Denver Intl

Fri 28/11

16:20-7:05

1 stop29h 45m

R16 943

Flights are sorted by cheapest return flights first.

Deals found on 28/10

Showing 1-10 of 13 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 14 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 26 hours 30 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 Turkish Airlines, United Airlines and SWISS.

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

See what other customers who have flown with KLM, Virgin Atlantic, andAir France to the United States have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

KLM

7,7

Good

1 406 reviews

Check prices

Reviews

1 / 20

2,0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

KLM

7,7

Good

1 406 reviews

KLM

7,7

Good

1 406 reviews

Check prices

Reviews

1 / 20

2,0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Virgin Atlantic

7,5

Good

670 reviews

KLM

7,7

Good

1 406 reviews

Check prices

Reviews

1 / 20

2,0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Air France

7,4

Good

1 482 reviews

KLM

7,7

Good

1 406 reviews

Check prices

Reviews

1 / 20

2,0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

United Airlines

7,4

Good

9 001 reviews

KLM

7,7

Good

1 406 reviews

Check prices

Reviews

1 / 20

2,0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

British Airways

6,7

Okay

7 483 reviews

KLM

7,7

Good

1 406 reviews

Check prices

Reviews

1 / 20

2,0

Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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 R1 783, however they can be found for as little as R1 629.
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 (22 hours 38 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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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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R10 045+ 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 25/11. 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 29 October 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 29 October 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 29 October 2025.

Cheapflights Fare Finder

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 24 October 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

See what other customers who have flown with KLM, Virgin Atlantic, andAir France to the United States have to say. You can also see how each airline compares 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 29 October 2025.