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R11 393+ 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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
May 28 — Jun 41
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 28 April 2026.

Mon 11/517:00
JNB
-
DEN
2 stops37h 40m
Kenya Airways
Tue 8/923:59
DEN
-
JNB
2 stops50h 56m
Kenya Airways
Deal found 27/4R18 691
Sun 13/1210:10
JNB
-
DEN
1 stop37h 25m
Lufthansa
Mon 4/112:30
DEN
-
JNB
1 stop21h 05m
Lufthansa
Deal found 25/4R18 707
Thu 7/512:10
JNB
-
DEN
2 stops38h 37m
Multiple Airlines
Wed 5/823:59
DEN
-
JNB
2 stops31h 51m
Multiple Airlines
Deal found 24/4R19 087
Mon 11/521:15
JNB
-
DEN
1 stop27h 05m
American Airlines
Tue 8/918:40
DEN
-
JNB
1 stop28h 20m
American Airlines
Deal found 23/4R19 268
Tue 5/522:00
JNB
-
DEN
1 stop29h 07m
United Airlines
Tue 4/810:02
DEN
-
JNB
1 stop24h 28m
United Airlines
Deal found 25/4R19 318

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 28 April 2026.

Return from

R18 691

One-way from

R11 393

Popular in

March

Cheapest in

February

Average price

R19 285
Kenya Airways
  • Kenya Airways
  • 11/5-8/9
  • 4 total stops
  • 88h 36m total
  • Johannesburg to Denver
Search Deals
7/6
  • 7/6
  • 3 total stops
  • 58h 58m total
  • Johannesburg to Boulder
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (R1 091 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (R534 potential savings vs. average return price).
Search Deals
Average for return flights in April 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 28 April 2026.
Use the filters below to find and compare flights to Boulder that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 11/5

17:00-22:40

2 stops37h 40m

Denver Intl

Tue 8/9

23:59-10:55

2 stops50h 56m

R18 691

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 11/5

17:00-22:59

2 stops37h 59m

Denver Intl

Tue 8/9

23:59-15:50

2 stops31h 51m

R19 351

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 11/5

8:45-14:20

1 stop37h 35m

Denver Intl

Tue 8/9

17:40-8:35

1 stop30h 55m

R22 389

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Mon 25/5

19:25-19:36

2 stops32h 11m

Denver Intl

Wed 10/6

20:00-9:25

2 stops29h 25m

R23 248

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 23/5

20:25-20:15

2 stops31h 50m

Denver Intl

Thu 11/6

11:10-21:20

2 stops26h 10m

R24 568

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 23/5

18:50-15:40

1 stop28h 50m

Denver Intl

Wed 10/6

17:40-10:20

1 stop32h 40m

R25 163
Fastest return journey

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 9/6

19:25-16:25

1 stop29h 00m

Denver Intl

Tue 16/6

18:35-7:00

1 stop28h 25m

R28 482

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 21/5

18:50-15:40

1 stop28h 50m

Denver Intl

Tue 9/6

6:35-21:20

2 stops30h 45m

R31 156

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sat 15/8

13:45-22:58

3 stops41h 13m

Denver Intl

Mon 24/8

19:15-19:20

2 stops40h 05m

R31 883

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 11/6

18:00-15:40

1 stop29h 40m

Denver Intl

Thu 16/7

6:35-21:20

2 stops30h 45m

R33 138

Flights are sorted by cheapest return flights first.

Deals found on 24/4

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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

How long is the flight to Boulder?

On average, a flight from Johannesburg to Boulder takes 37 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.

United Airlines
United Airlines
From R15 724
British Airways
British Airways
From R16 227
Virgin Atlantic
Virgin Atlantic
From R14 542
KLM
KLM
From R15 672

What are the cheapest airlines that fly to Boulder?

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

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 28 April 2026.
See what other customers who have flown with KLM,United Airlines, andVirgin Atlantic 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
7,8
Good
1 508 reviews
Check prices

Crew

8,4

Entertainment

7,1

Overall

7,8

Food

7,3

Comfort

7,7

Boarding

7,8

Reviews

1 / 20
6,0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7,8
Good
1 508 reviews
KLM
7,8
Good
1 508 reviews
Check prices

Crew

8,4

Entertainment

7,1

Overall

7,8

Food

7,3

Comfort

7,7

Boarding

7,8

Reviews

1 / 20
6,0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7,4
Good
9 672 reviews
KLM
7,8
Good
1 508 reviews
Check prices

Crew

8,4

Entertainment

7,1

Overall

7,8

Food

7,3

Comfort

7,7

Boarding

7,8

Reviews

1 / 20
6,0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Virgin Atlantic
7,4
Good
688 reviews
KLM
7,8
Good
1 508 reviews
Check prices

Crew

8,4

Entertainment

7,1

Overall

7,8

Food

7,3

Comfort

7,7

Boarding

7,8

Reviews

1 / 20
6,0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Lufthansa
6,8
Okay
7 956 reviews
KLM
7,8
Good
1 508 reviews
Check prices

Crew

8,4

Entertainment

7,1

Overall

7,8

Food

7,3

Comfort

7,7

Boarding

7,8

Reviews

1 / 20
6,0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
British Airways
6,7
Okay
7 927 reviews
KLM
7,8
Good
1 508 reviews
Check prices

Crew

8,4

Entertainment

7,1

Overall

7,8

Food

7,3

Comfort

7,7

Boarding

7,8

Reviews

1 / 20
6,0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

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 412, however they can be found for as little as R3 137.

  • 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 (31 hours 29 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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