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R11 542+ 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 15/2. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
Feb 26 — Mar 51
1 adult
1 adult, Economy, 0 bags

Flights to Boulder in 2026

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 27 January 2026.

Thu 12/219:45
JNB
-
DEN
2 stops29h 51m
United Airlines
Fri 27/27:45
DEN
-
JNB
2 stops25h 50m
United Airlines
Deal found 27/1R15 490
Mon 25/521:15
JNB
-
DEN
1 stop27h 15m
American Airlines
Fri 5/618:40
DEN
-
JNB
1 stop30h 45m
American Airlines
Deal found 27/1R15 618
Sun 1/222:00
JNB
-
DEN
2 stops31h 05m
Delta
Sun 15/213:10
DEN
-
JNB
2 stops34h 25m
Delta
Deal found 24/1R15 698
Thu 12/221:30
JNB
-
DEN
2 stops31h 35m
Delta
Fri 27/26:00
DEN
-
JNB
1 stop28h 00m
Delta
Deal found 26/1R15 730
Mon 25/521:15
JNB
-
DEN
2 stops28h 10m
British Airways
Fri 5/615:11
DEN
-
JNB
2 stops34h 14m
British Airways
Deal found 27/1R16 001
Thu 30/421:15
JNB
-
DEN
2 stops27h 37m
American Airlines
Wed 10/618:40
DEN
-
JNB
1 stop28h 20m
American Airlines
Deal found 26/1R16 049
Thu 12/319:20
JNB
-
DEN
2 stops36h 19m
Delta
Thu 19/312:51
DEN
-
JNB
2 stops25h 14m
Delta
Deal found 26/1R16 145
Sun 1/219:35
JNB
-
DEN
1 stop28h 55m
British Airways
Sun 15/217:25
DEN
-
JNB
1 stop32h 00m
British Airways
Deal found 24/1R16 241
Thu 12/310:25
JNB
-
DEN
2 stops33h 47m
United Airlines
Thu 19/312:33
DEN
-
JNB
1 stop22h 02m
United Airlines
Deal found 26/1R16 305
Fri 13/319:45
JNB
-
DEN
2 stops32h 03m
United Airlines
Fri 20/37:45
DEN
-
JNB
2 stops26h 50m
United Airlines
Deal found 26/1R16 545

Find flight deals to Boulder

Find the latest flights to Boulder in 2026, 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 27 January 2026.

Return from

R15 490

One-way from

R11 542

Popular in

June

Cheapest in

January

Average price

R15 778
United Airlines
  • United Airlines
  • 12/2-27/2
  • 4 total stops
  • 55h 41m total
  • Johannesburg to Denver
Search Deals
15/2
  • 15/2
  • 3 total stops
  • 51h 56m total
  • Johannesburg to Boulder
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (R1 184 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (R329 potential savings vs. average return price).
Search Deals
Average for return flights in January 2026
Search Deals

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 27 January 2026.
Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Johannesburg

Route

Depart

Return

Price

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 12/2

19:45-16:36

2 stops29h 51m

Denver Intl

Fri 27/2

7:45-18:35

2 stops25h 50m

R15 490

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 25/5

21:15-16:30

1 stop27h 15m

Denver Intl

Fri 5/6

18:40-9:25

1 stop30h 45m

R15 618

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 12/2

21:30-0:23

2 stops35h 53m

Denver Intl

Fri 27/2

6:00-19:00

1 stop28h 00m

R15 730

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Fri 13/2

22:00-21:06

2 stops32h 06m

Denver Intl

Fri 27/2

6:00-19:00

1 stop28h 00m

R15 730

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 30/4

21:15-16:30

1 stop27h 15m

Denver Intl

Wed 10/6

18:40-7:00

1 stop28h 20m

R15 890

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 30/4

20:25-16:55

2 stops28h 30m

Denver Intl

Wed 10/6

11:40-21:35

2 stops25h 55m

R15 890

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 15/2

17:00-11:56

3 stops51h 56m

R11 542

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 20/6

18:00-15:40

1 stop29h 40m

R13 747

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 15/2

19:35-15:30

1 stop28h 55m

R14 067

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 20/6

12:10-22:49

2 stops42h 39m

R14 083

Flights are sorted by cheapest return flights first.

Deals found on 27/1

Showing 1-10 of 14 results
1
2

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?

Use this chart to determine the optimal time to book a return flight from Johannesburg to Boulder. Price data was last updated on 23 January 2026.

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 31 hours 35 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.

British Airways
British Airways
From R15 612
United Airlines
United Airlines
From R14 758
Virgin Atlantic
Virgin Atlantic
From R14 079
KLM
KLM
From R15 143

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Johannesburg to Boulder are Lufthansa, American Airlines and Virgin Atlantic.

Rainfall in Boulder by month

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

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

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 27 January 2026.
See what other customers who have flown with KLM, Virgin Atlantic, andUnited Airlines 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
1 443 reviews
Check prices

Entertainment

7,1

Comfort

7,6

Food

7,3

Crew

8,4

Overall

7,7

Boarding

7,8

Reviews

1 / 20
10,0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7,7
Good
1 443 reviews
KLM
7,7
Good
1 443 reviews
Check prices

Entertainment

7,1

Comfort

7,6

Food

7,3

Crew

8,4

Overall

7,7

Boarding

7,8

Reviews

1 / 20
10,0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Virgin Atlantic
7,5
Good
678 reviews
KLM
7,7
Good
1 443 reviews
Check prices

Entertainment

7,1

Comfort

7,6

Food

7,3

Crew

8,4

Overall

7,7

Boarding

7,8

Reviews

1 / 20
10,0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
United Airlines
7,4
Good
9 205 reviews
KLM
7,7
Good
1 443 reviews
Check prices

Entertainment

7,1

Comfort

7,6

Food

7,3

Crew

8,4

Overall

7,7

Boarding

7,8

Reviews

1 / 20
10,0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Lufthansa
6,8
Okay
7 749 reviews
KLM
7,7
Good
1 443 reviews
Check prices

Entertainment

7,1

Comfort

7,6

Food

7,3

Crew

8,4

Overall

7,7

Boarding

7,8

Reviews

1 / 20
10,0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
British Airways
6,7
Okay
7 702 reviews
KLM
7,7
Good
1 443 reviews
Check prices

Entertainment

7,1

Comfort

7,6

Food

7,3

Crew

8,4

Overall

7,7

Boarding

7,8

Reviews

1 / 20
10,0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

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 R3 304, however they can be found for as little as R3 038.

  • 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 20 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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