Find flights
Airlines

R11 366+ 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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
May 17 — May 241
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 17 April 2026.

Thu 7/517:00
JNB
-
DEN
2 stops33h 47m
Multiple Airlines
Wed 5/86:35
DEN
-
JNB
2 stops44h 20m
Multiple Airlines
Deal found 15/4R18 277
Sun 10/51:15
JNB
-
DEN
2 stops53h 25m
Kenya Airways
Tue 8/923:59
DEN
-
JNB
2 stops40h 16m
Kenya Airways
Deal found 14/4R18 539
Sun 13/1210:10
JNB
-
DEN
1 stop37h 25m
Lufthansa
Mon 4/18:17
DEN
-
JNB
2 stops25h 18m
Lufthansa
Deal found 13/4R18 621
Tue 5/512:10
JNB
-
DEN
2 stops39h 32m
Multiple Airlines
Tue 4/86:35
DEN
-
JNB
2 stops44h 20m
Multiple Airlines
Deal found 15/4R18 933
Sun 13/1222:00
JNB
-
DEN
1 stop26h 30m
Multiple Airlines
Mon 4/116:55
DEN
-
JNB
2 stops29h 40m
Multiple Airlines
Deal found 13/4R18 998
Sun 13/1222:00
JNB
-
DEN
1 stop26h 30m
British Airways
Mon 4/116:55
DEN
-
JNB
2 stops29h 40m
British Airways
Deal found 14/4R19 113

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 17 April 2026.

Return from

R18 277

One-way from

R11 366

Popular in

March

Cheapest in

February

Average price

R18 867
7/5-5/8
  • 7/5-5/8
  • 4 total stops
  • 78h 07m total
  • Johannesburg to Denver
Search Deals
14/5
  • 14/5
  • 3 total stops
  • 38h 58m total
  • Johannesburg to Boulder
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (R1 089 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (R540 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 17 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

Fri 3/7

9:50-13:29

2 stops35h 39m

Denver Intl

Sat 8/8

14:04-8:20

2 stops34h 16m

R22 617
Fastest return journey

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Tue 5/5

22:00-14:26

1 stop24h 26m

Denver Intl

Tue 4/8

11:37-18:30

1 stop22h 53m

R23 502

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Fri 1/5

19:50-23:04

2 stops35h 14m

Denver Intl

Fri 8/5

7:36-10:30

2 stops42h 54m

R23 567

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 7/5

19:00-15:40

1 stop28h 40m

Denver Intl

Wed 5/8

12:40-18:30

1 stop21h 50m

R24 272

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 2/7

17:00-13:13

2 stops28h 13m

Denver Intl

Mon 6/7

23:59-0:15

2 stops40h 16m

R24 517

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Fri 3/7

19:00-22:15

2 stops35h 15m

Denver Intl

Sun 9/8

12:40-18:30

1 stop21h 50m

R25 696
Cheapest one-way

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Thu 14/5

19:50-22:59

2 stops35h 09m

R11 677

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Sun 10/5

19:50-22:59

2 stops35h 09m

R12 660

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 6/5

17:00-9:05

3 stops48h 05m

R12 725

JohannesburgDenver

JNB - DEN

JNBDEN

Johannesburg OR Tambo

Wed 22/4

19:50-23:04

2 stops35h 14m

R12 955

Flights are sorted by cheapest return flights first.

Deals found on 14/4

Showing 1-10 of 16 resultsSorted by cheapest first
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 10 April 2026.

To ensure you get the cheapest price possible for a flight to Boulder, you should look to book at least 77 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 57 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 597
British Airways
British Airways
From R16 077
Virgin Atlantic
Virgin Atlantic
From R14 424
KLM
KLM
From R15 545

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 17 April 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
7,8
Good
1 499 reviews
Check prices

Boarding

7,8

Food

7,3

Crew

8,4

Entertainment

7,2

Overall

7,8

Comfort

7,7

Reviews

1 / 20
2,0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7,8
Good
1 499 reviews
KLM
7,8
Good
1 499 reviews
Check prices

Boarding

7,8

Food

7,3

Crew

8,4

Entertainment

7,2

Overall

7,8

Comfort

7,7

Reviews

1 / 20
2,0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Virgin Atlantic
7,5
Good
687 reviews
KLM
7,8
Good
1 499 reviews
Check prices

Boarding

7,8

Food

7,3

Crew

8,4

Entertainment

7,2

Overall

7,8

Comfort

7,7

Reviews

1 / 20
2,0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7,4
Good
9 601 reviews
KLM
7,8
Good
1 499 reviews
Check prices

Boarding

7,8

Food

7,3

Crew

8,4

Entertainment

7,2

Overall

7,8

Comfort

7,7

Reviews

1 / 20
2,0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6,8
Okay
7 926 reviews
KLM
7,8
Good
1 499 reviews
Check prices

Boarding

7,8

Food

7,3

Crew

8,4

Entertainment

7,2

Overall

7,8

Comfort

7,7

Reviews

1 / 20
2,0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
British Airways
6,7
Okay
7 890 reviews
KLM
7,8
Good
1 499 reviews
Check prices

Boarding

7,8

Food

7,3

Crew

8,4

Entertainment

7,2

Overall

7,8

Comfort

7,7

Reviews

1 / 20
2,0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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 385, however they can be found for as little as R3 112.

  • 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 57 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

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.
First class flights to Boulder
Business class flights to Boulder
Prem Economy class flights to Boulder
Economy class flights to Boulder

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?

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book With Flexibility

Our users can plan ahead with confidence and find flights with no change fees.

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.