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$434+ Cheap flights from Denver (DEN) to Sydney (SYD)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SYD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to Sydney Kingsford Smith are usually found in April or May, booked 84 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Denver to Sydney

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Sydney (SYD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$1,002
(Alaska Airlines)

One-way from

$434
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$1,109
From Denver Intl to Sydney Kingsford Smith
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One-way flight from Denver Intl to Sydney Kingsford Smith
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Highest demand for flights based on searches. 15% potential increase in price ($201 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Denver to Sydney

Cheapest flights from Denver to Sydney
Explore the most affordable flight options available from Denver to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:02 pmDEN - SYD
2 stops29h 43mAlaska Airlines
Sun 12/149:40 pmSYD - DEN
2 stops32h 04mAlaska Airlines
Deal found 9/10$1,002
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/148:02 pmDEN - SYD
2 stops29h 43mAlaska Airlines
Sun 12/149:40 pmSYD - DEN
2 stops38h 23mAlaska Airlines
Deal found 9/10$1,012
This Alaska Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/216:20 pmDEN - SYD
2 stops32h 25mAlaska Airlines
Tue 10/289:40 pmSYD - DEN
2 stops34h 01mAlaska Airlines
Deal found 9/11$1,013
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/118:02 pmDEN - SYD
2 stops29h 43mAlaska Airlines
Sun 12/149:40 pmSYD - DEN
2 stops38h 23mAlaska Airlines
Deal found 9/10$1,021
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/19:48 amDEN - SYD
2 stops33h 42mMultiple Airlines
Mon 11/102:00 pmSYD - DEN
2 stops23h 00mMultiple Airlines
Deal found 9/11$1,034
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:02 pmDEN - SYD
2 stops29h 43mAlaska Airlines
Thu 11/209:40 pmSYD - DEN
1 stop32h 14mAlaska Airlines
Deal found 9/10$1,037
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/266:34 pmDEN - SYD
2 stops25h 11mMultiple Airlines
Mon 10/62:15 pmSYD - DEN
2 stops27h 21mMultiple Airlines
Deal found 9/11$1,040
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/131:23 pmDEN - SYD
2 stops36h 22mAlaska Airlines
Sun 12/149:40 pmSYD - DEN
2 stops35h 06mAlaska Airlines
Deal found 9/10$1,043
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2411:15 amDEN - SYD
2 stops32h 30mMultiple Airlines
Fri 10/31:15 pmSYD - DEN
2 stops27h 11mMultiple Airlines
Deal found 9/11$1,047

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Denver to Sydney that are best for you.

Fly from

Denver

Fly to

Sydney

Route

Depart

Return

Price

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Wed 9/24

11:15 am-11:45 am

2 stops32h 30m

Sydney Kingsford Smith

Fri 10/3

1:15 pm-12:26 am

2 stops27h 11m

$1,047

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Wed 11/12

3:37 pm-7:45 pm

2 stops34h 08m

Sydney Kingsford Smith

Thu 11/20

9:40 pm-11:54 am

2 stops32h 14m

$1,063

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Wed 10/15

3:02 pm-7:45 pm

2 stops35h 43m

Sydney Kingsford Smith

Fri 10/31

9:40 pm-12:27 pm

2 stops31h 47m

$1,106

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Sat 11/29

12:05 pm-9:45 pm

2 stops39h 40m

Sydney Kingsford Smith

Tue 12/9

9:55 am-6:27 am

2 stops38h 32m

$1,293

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Sat 11/29

4:45 pm-9:00 am

1 stop22h 15m

Sydney Kingsford Smith

Tue 12/9

11:15 am-12:23 pm

1 stop19h 08m

$1,337

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Tue 12/30

1:08 pm-6:50 am

1 stop23h 42m

Sydney Kingsford Smith

Tue 1/13

10:40 am-6:09 pm

1 stop25h 29m

$1,362

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Mon 12/29

5:30 am-8:30 am

2 stops33h 00m

Sydney Kingsford Smith

Tue 1/27

10:40 am-3:13 pm

2 stops22h 33m

$1,367

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Wed 12/31

7:10 am-8:30 am

2 stops31h 20m

Sydney Kingsford Smith

Mon 1/26

10:40 am-3:13 pm

2 stops22h 33m

$1,367

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Sun 12/28

6:25 am-6:50 am

1 stop30h 25m

Sydney Kingsford Smith

Wed 1/28

10:40 am-6:09 pm

1 stop25h 29m

$1,371

DenverSydney

DEN - SYD

DENSYD

Denver Intl

Sat 11/1

10:00 am-9:00 am

2 stops30h 00m

$447

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 19 results
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Best time to book a flight from Denver to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Denver with our price prediction graph.
Estimated round-trip 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 from Denver to Sydney

How far ahead should I book a flight from Denver to Sydney?

Use this chart to determine the optimal time to book a round-trip flight from Denver to Sydney. Price data was last updated on August 29, 2025.

The price you pay for your flight from Denver to Sydney may vary depending on when you book. For the best chance of a lower fare, look to book 84 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Denver to Sydney?

Currently, February is the cheapest month in which you can book a flight from Denver to Sydney (average of $1,035). Flying from Denver to Sydney in December is currently the most expensive (average of $1,626). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to SYD?

Find hourly flight availability from Denver to Sydney. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Denver to Sydney at noon. If you’re flexible enough to do this you can expect to save up to 28% on your trip compared to booking a flight in the evening.

What is the cheapest day to fly from Denver to Sydney?

Use this chart to determine the cheapest time to fly round-trip from Denver to Sydney. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Denver to Sydney flight should consider departing on Saturday at noon when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Denver to Sydney?

Reviews of airlines servicing Sydney

Get insights into the airlines that provide service to Sydney. 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 Sydney. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Denver to Sydney, such as Delta, Qantas Airways, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Qantas Airways
7.5
Good
905 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,960 reviews

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Denver to Sydney. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Denver to Sydney?

    For as low as $1,063, Alaska Airlines can have you in Sydney from Denver in 34h 08m. The distance between Denver and Sydney is about 8348 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Denver to Sydney round-trip?

    Currently priced at $745, Alaska Airlines will fly you from Denver to Sydney and back. In addition to Alaska Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and Qantas Airways - these airlines can fly you to your destination from $786 and $806, respectively. These flights start at 31% lower than the current average price 3 months from now.

  • Where are the most common layover locations when flying from Denver to Sydney?

    Most of the time, Denver to Sydney flights that have layovers will stop in Los Angeles.

  • What are some popular things to do or see while on a layover in Los Angeles?

    Hollywood Bowl, Hollywood Walk of Fame, and The Wiltern are the most popular attractions in Los Angeles if you're in need of something to do during your layover. Hollywood Bowl, Hollywood Walk of Fame, and The Wiltern are located about 12.5 mi, 11.7 mi, and 10.0 mi, respectively from Los Angeles. Travelers in need of a car in Los Angeles can rent one for about $49 per day.

  • Where are the least popular layover locations for Denver to Sydney flights?

    Flights departing from Denver and landing in Sydney layover in Vancouver least frequently.

  • Can I find deals for flights from Denver to Sydney that include hotel bookings?

    Yes. In addition to deals on Denver to Sydney flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Sydney?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Sydney.

  • Can I find deals for business class flights from Denver to Sydney?

    Yes. Cheapflights offers flight deals from Denver to Sydney by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Denver to Sydney?

    Currently, February is the cheapest month in which you can book a flight from Denver to Sydney (average of $1,035). Flying from Denver to Sydney in December is currently the most expensive (average of $1,626). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Wollongong
Manly
Coogee

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Denver to Sydney

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Coolangatta flights
Aspen to Sydney flights
Colorado Springs to Sydney flights

Top 7 airlines flying from Denver to Sydney

Discover the top 7 airlines that operate flights from Denver to Sydney. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$745Average$856FlexibilityNo cancel feeOn-time75%
DeltaCheapest$786Average$1,338FlexibilityNo cancel feeOn-timeN/A
Qantas AirwaysCheapest$806Average$904FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$832Average$867FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$834Average$1,298FlexibilityNo cancel feeOn-time78%
Air CanadaCheapest$1,009Average$1,232FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,261Average$1,473FlexibilityNo cancel feeOn-time69%

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