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, SWISS 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, Johannesburg offers the quickest one-way flight (27 hours 10 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).

R13 640+ Flights to Boulder

Flights to Boulder in 2025

Return from	R20 372
One-way from	R15 561
Popular in	August
Cheapest in	October
Average price	R20 295

KLM
7/5-22/5
3 total stops
72h 20m total
Johannesburg to Denver

Search Deals

Qatar Airways
30/4
2 total stops
41h 04m total
Johannesburg to Boulder

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (R44 692 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (R7 577 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 11 April 2025.

Sat 8/1123:55JNB - DEN

2 stops32h 52mMultiple Airlines

Mon 17/1115:45DEN - JNB

2 stops32h 30mMultiple Airlines

Deal found 10/4R19 131

Sun 13/421:15JNB - DEN

1 stop27h 10mBritish Airways

Wed 3/1217:30DEN - JNB

1 stop29h 00mBritish Airways

Deal found 10/4R19 771

Wed 16/418:50JNB - DEN

1 stop28h 40mDelta

Wed 3/1212:20DEN - JNB

2 stops35h 55mDelta

Deal found 10/4R20 625

Fri 31/101:15JNB - DEN

2 stops54h 31mKenya Airways

Wed 12/1123:59DEN - JNB

2 stops49h 56mKenya Airways

Deal found 10/4R20 819

Wed 16/420:40JNB - DEN

2 stops35h 00mVirgin Atlantic

Wed 3/1212:20DEN - JNB

2 stops38h 10mVirgin Atlantic

Deal found 10/4R21 556

Wed 7/523:15JNB - DEN

2 stops32h 49mKLM

Thu 22/517:40DEN - JNB

2 stops43h 40mKLM

Deal found 10/4R21 672

Thu 10/421:20JNB - DEN

2 stops33h 24mUnited Airlines

Sat 7/68:05DEN - JNB

2 stops25h 40mUnited Airlines

Deal found 10/4R22 604

Wed 20/821:15JNB - DEN

1 stop27h 10mAmerican Airlines

Wed 27/818:35DEN - JNB

1 stop30h 50mAmerican Airlines

Deal found 10/4R23 166

Mon 14/419:00JNB - DEN

1 stop28h 55mLufthansa

Mon 1/1217:45DEN - JNB

1 stop30h 45mLufthansa

Deal found 10/4R25 262

Sat 10/518:50JNB - DEN

1 stop28h 40mAir France

Sat 24/512:35DEN - JNB

2 stops35h 50mAir France

Deal found 10/4R25 339

Wed 16/417:55JNB - DEN

1 stop32h 00mTurkish Airlines

Tue 2/1219:35DEN - JNB

1 stop30h 15mTurkish Airlines

Deal found 10/4R30 384

Thu 26/619:35JNB - DEN

1 stop28h 45mSWISS

Wed 9/717:50DEN - JNB

1 stop31h 30mSWISS

Deal found 10/4R30 714

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 11 April 2025.

Wed 7/518:50JNB - DEN

1 stop28h 40mMultiple Airlines

Thu 22/517:40DEN - JNB

2 stops43h 40mMultiple Airlines

Deal found 10/4R20 372

Wed 7/523:15JNB - DEN

2 stops32h 49mKLM

Thu 22/517:40DEN - JNB

2 stops43h 40mKLM

Deal found 10/4R21 672

Wed 20/821:15JNB - DEN

2 stops31h 32mBritish Airways

Wed 27/818:35DEN - JNB

1 stop28h 25mBritish Airways

Deal found 10/4R22 254

Wed 20/821:15JNB - DEN

1 stop27h 10mAmerican Airlines

Wed 27/818:35DEN - JNB

1 stop30h 50mAmerican Airlines

Deal found 10/4R23 166

Tue 19/81:15JNB - DEN

2 stops49h 23mKenya Airways

Wed 27/823:59DEN - JNB

2 stops40h 16mKenya Airways

Deal found 10/4R25 087

Sat 10/518:50JNB - DEN

1 stop28h 40mAir France

Sat 24/512:35DEN - JNB

2 stops35h 50mAir France

Deal found 10/4R25 339

Sat 28/620:40JNB - DEN

2 stops34h 06mVirgin Atlantic

Thu 10/712:20DEN - JNB

2 stops38h 00mVirgin Atlantic

Deal found 10/4R28 638

Thu 26/619:35JNB - DEN

1 stop28h 45mSWISS

Wed 9/717:50DEN - JNB

1 stop31h 30mSWISS

Deal found 10/4R30 714

Wed 20/822:50JNB - DEN

3 stops47h 53mEthiopian Air

Wed 27/814:10DEN - JNB

2 stops38h 55mEthiopian Air

Deal found 10/4R36 321

Sat 28/617:50JNB - DEN

1 stop32h 05mTurkish Airlines

Sat 19/719:50DEN - JNB

1 stop30h 45mTurkish Airlines

Deal found 10/4R37 892

Sat 10/518:50JNB - DEN

1 stop28h 40mDelta

Fri 23/50:55DEN - JNB

2 stops34h 45mDelta

Deal found 10/4R39 464

Sat 28/619:00JNB - DEN

1 stop28h 35mUnited Airlines

Sat 19/723:59DEN - JNB

2 stops33h 46mUnited Airlines

Deal found 10/4R42 045

Last-minute flights to Boulder
Discover last-minute flight deals to Boulder. Data last updated 11 April 2025 and is based on user searches.

Sat 12/41:15JNB - DEN

2 stops50h 38mKenya Airways

Sun 20/46:05DEN - JNB

2 stops44h 50mKenya Airways

Deal found 10/4R46 216

Sun 13/421:15JNB - DEN

1 stop27h 10mBritish Airways

Wed 3/1217:30DEN - JNB

1 stop29h 00mBritish Airways

Deal found 10/4R19 771

Mon 14/419:00JNB - DEN

1 stop28h 55mLufthansa

Fri 5/1217:45DEN - JNB

1 stop30h 45mLufthansa

Deal found 10/4R25 262

Wed 16/418:50JNB - DEN

1 stop28h 40mDelta

Wed 3/1212:20DEN - JNB

2 stops35h 55mDelta

Deal found 10/4R20 625

Wed 16/417:00JNB - DEN

2 stops34h 53mMultiple Airlines

Wed 3/1223:59DEN - JNB

2 stops39h 16mMultiple Airlines

Deal found 10/4R20 857

Wed 16/420:40JNB - DEN

2 stops35h 00mVirgin Atlantic

Wed 3/1212:20DEN - JNB

2 stops38h 10mVirgin Atlantic

Deal found 10/4R21 556

Wed 16/419:25JNB - DEN

1 stop29h 00mBritish Airways

Fri 5/1217:30DEN - JNB

1 stop31h 50mBritish Airways

Deal found 10/4R28 133

Wed 16/417:55JNB - DEN

1 stop32h 00mTurkish Airlines

Tue 2/1219:35DEN - JNB

1 stop30h 15mTurkish Airlines

Deal found 10/4R30 384

Sat 19/419:00JNB - DEN

1 stop28h 55mLufthansa

Fri 5/1217:45DEN - JNB

1 stop30h 45mLufthansa

Deal found 10/4R25 262

Sat 19/419:00JNB - DEN

1 stop28h 55mUnited Airlines

Thu 4/1211:30DEN - JNB

1 stop22h 05mUnited Airlines

Deal found 10/4R27 066

Sat 19/419:00JNB - DEN

1 stop28h 55mUnited Airlines

Sat 6/128:17DEN - JNB

2 stops25h 18mUnited Airlines

Deal found 10/4R27 260

Wed 7/518:50JNB - DEN

1 stop28h 40mMultiple Airlines

Thu 22/517:40DEN - JNB

2 stops43h 40mMultiple Airlines

Deal found 10/4R20 372

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 11 April 2025.

Wed 30/413:55JNB - DEN

2 stops41h 04mQatar Airways

Deal found 10/4R15 561

Wed 30/417:00JNB - DEN

3 stops32h 27mMultiple Airlines

Deal found 10/4R16 317

Tue 29/41:15JNB - DEN

2 stops50h 38mKenya Airways

Deal found 10/4R16 861

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 7/5

18:50-15:30

1 stop28h 40m

Denver Intl

Thu 22/5

17:40-21:20

2 stops43h 40m

R20 372

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 7/5

23:15-0:04

2 stops32h 49m

Denver Intl

Thu 22/5

17:40-21:20

2 stops43h 40m

R21 672

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 20/8

21:15-20:47

2 stops31h 32m

Denver Intl

Wed 27/8

18:35-7:00

1 stop28h 25m

R22 254

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 20/8

21:15-16:25

1 stop27h 10m

Denver Intl

Wed 27/8

18:35-9:25

1 stop30h 50m

R23 166

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

R25 087

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 10/5

18:50-15:30

1 stop28h 40m

Denver Intl

Sat 24/5

12:35-8:25

2 stops35h 50m

R25 339

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 28/6

20:40-22:46

2 stops34h 06m

Denver Intl

Thu 10/7

12:20-10:20

2 stops38h 00m

R28 638

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 26/6

19:35-16:20

1 stop28h 45m

Denver Intl

Wed 9/7

17:50-9:20

1 stop31h 30m

R30 714

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 20/8

22:50-14:43

3 stops47h 53m

Denver Intl

Wed 27/8

14:10-13:05

2 stops38h 55m

R36 321

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

R37 892

Flights are sorted by cheapest return flights first.

Deals found on 11/4

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 62 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 British Airways, United Airlines and Air France.

British Airways

From R956

United Airlines

From R924

Air France

From R926

Kenya Airways

From R1 017

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Johannesburg to Boulder are SWISS, KLM 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, KLM and SWISS. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8,0

Very Good

7 910 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

7 910 reviews

Delta

8,0

Very Good

7 910 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

KLM

7,8

Good

1 321 reviews

Delta

8,0

Very Good

7 910 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

SWISS

7,5

Good

1 575 reviews

Delta

8,0

Very Good

7 910 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

Qatar Airways

7,4

Good

3 549 reviews

Delta

8,0

Very Good

7 910 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

Air France

7,4

Good

1 428 reviews

Delta

8,0

Very Good

7 910 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, SWISS 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, Johannesburg offers the quickest one-way flight (27 hours 10 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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R13 640+ 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 26/9. 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 11 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 11 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 11 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 594 507 searches and data was last updated on 11 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 Johannesburg to Boulder. Price data was last updated on 4 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

Read through reviews of airlines servicing Boulder, such as Delta, KLM and SWISS. 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 11 April 2025.