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$807+ 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 18/6. Fares are subject to change and may not be available on all flights or dates of travel.
— DEN
11 Jul — 18 Jul1
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 11 June 2026.

Thu 23/706:15
SYD
-
DEN
2 stops30h 57m
Multiple Airlines
Tue 4/807:25
DEN
-
SYD
2 stops46h 45m
Multiple Airlines
Deal found 6/6$1,263
Fri 24/706:15
SYD
-
DEN
2 stops34h 14m
Multiple Airlines
Tue 4/807:25
DEN
-
SYD
2 stops36h 25m
Multiple Airlines
Deal found 6/6$1,273
Sat 25/713:15
SYD
-
DEN
2 stops27h 14m
Multiple Airlines
Tue 4/807:25
DEN
-
SYD
2 stops46h 45m
Multiple Airlines
Deal found 6/6$1,289
Fri 24/706:15
SYD
-
DEN
2 stops34h 14m
Multiple Airlines
Wed 5/807:25
DEN
-
SYD
2 stops36h 25m
Multiple Airlines
Deal found 6/6$1,361
Sat 25/706:00
SYD
-
DEN
2 stops34h 29m
Multiple Airlines
Sat 1/807:00
DEN
-
SYD
2 stops47h 10m
Multiple Airlines
Deal found 10/6$1,366
Mon 13/713:15
SYD
-
DEN
2 stops27h 14m
Multiple Airlines
Sun 26/715:20
DEN
-
SYD
2 stops38h 50m
Multiple Airlines
Deal found 8/6$1,386
Thu 29/1010:20
SYD
-
DEN
2 stops24h 44m
Air Canada
Fri 13/1119:00
DEN
-
SYD
1 stop20h 35m
Air Canada
Deal found 6/6$1,467
Sat 31/1011:15
SYD
-
DEN
1 stop29h 14m
American Airlines
Sun 15/1114:48
DEN
-
SYD
1 stop22h 07m
American Airlines
Deal found 8/6$1,477

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 647,157 searches and data was last updated on 11 June 2026.

Return from

$1,263

One-way from

$807

Popular in

July

Cheapest in

November

Average price

$2,292
23/7-4/8
  • 23/7-4/8
  • 4 total stops
  • 77h 42m total
  • Sydney to Denver
Search Deals
18/6
  • 18/6
  • 3 total stops
  • 33h 20m total
  • Sydney to Boulder
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($292 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($51 potential savings vs. average return price).
Search Deals
Average for return flights in June 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 647,157 searches and data was last updated on 11 June 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

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Thu 29/10

10:20-18:04

2 stops24h 44m

Denver Intl

Fri 13/11

19:00-09:35

1 stop20h 35m

$1,467
Fastest return journey

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Mon 2/11

11:20-12:29

1 stop19h 09m

Denver Intl

Tue 17/11

19:00-09:35

1 stop20h 35m

$1,515

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Sun 1/11

11:20-13:29

1 stop19h 09m

Denver Intl

Mon 16/11

19:00-09:35

1 stop20h 35m

$1,581

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Thu 12/11

11:20-16:38

2 stops23h 18m

Denver Intl

Mon 16/11

19:00-14:40

2 stops25h 40m

$1,655

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Mon 13/7

09:10-19:46

2 stops26h 36m

Denver Intl

Sun 26/7

09:15-07:05

2 stops29h 50m

$1,743

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Mon 17/8

12:00-15:29

1 stop19h 29m

Denver Intl

Sat 22/8

07:00-07:05

1 stop32h 05m

$1,845

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Thu 9/7

09:20-17:13

1 stop23h 53m

Denver Intl

Sat 11/7

11:23-07:20

2 stops27h 57m

$2,138

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Mon 2/11

19:10-17:50

3 stops40h 40m

Denver Intl

Tue 17/11

12:59-21:15

2 stops38h 16m

$2,496

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Wed 24/6

10:20-08:20

2 stops38h 00m

Denver Intl

Fri 10/7

05:15-06:55

1 stop33h 40m

$2,834
Cheapest one-way

SydneyDenver

SYD - DEN

SYDDEN

Sydney Kingsford Smith

Thu 18/6

07:20-00:40

3 stops33h 20m

$807

Flights are sorted by cheapest return flights first.

Deals found on 9/6

Showing 1-10 of 18 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

How long is the flight to Boulder?

On average, a flight from Sydney to Boulder takes 22 hours 39 minutes. Flights to Boulder from other popular cities in Australia 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 Sydney to Boulder are Air Canada, Qantas Airways and United Airlines.

Air Canada
Air Canada
From $1,239
United Airlines
United Airlines
From $557
Qantas Airways
Qantas Airways
From $1,195
Air New Zealand
Air New Zealand
From $1,227

What are the cheapest airlines that fly to Boulder?

The cheapest airlines flying from Sydney to Boulder are Qantas Airways, Air Canada and Air New Zealand.

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 11 June 2026.
See what other customers who have flown with Air New Zealand,Qantas Airways, 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.
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.4

Overall

8.0

Food

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
Air New Zealand
8.0
Very Good
645 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.4

Overall

8.0

Food

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
Qantas Airways
7.5
Good
1,046 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.4

Overall

8.0

Food

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
United Airlines
7.4
Good
9,804 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.4

Overall

8.0

Food

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
American Airlines
7.1
Good
11,639 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.4

Overall

8.0

Food

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding
Air Canada
7.1
Good
11,161 reviews
Air New Zealand
8.0
Very Good
645 reviews
Check prices

Crew

8.5

Comfort

7.9

Boarding

8.2

Entertainment

7.4

Overall

8.0

Food

7.4

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2026

SIN - AKL

We were stuck on tarmac for an hour after boarding

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, American Airlines 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 $567, however they can be found for as little as $82.

  • Where does the fastest flight to Boulder depart from?

    For those looking to save time traveling to Boulder, Brisbane offers the quickest one-way flight (19 hours 44 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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