DEN - SYD

$618 Find Cheap Flights from Denver to Sydney

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Sydney departing on 25/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Sydney

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Sydney, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Sydney, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Denver to Sydney (DEN-SYD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Denver to Sydney that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Denver to Sydney

Sat, 17 Jan - Sun, 1 Feb
United Airlines Logo
15:58 - 06:20DEN-SYD
20h 22m1 stop
United Airlines Logo
12:10 - 12:23SYD-DEN
18h 13m1 stop
$1,526United Airlines
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Tue, 25 Nov - Tue, 2 Dec
Multiple Airlines Logo
07:51 - 07:25DEN-SYD
29h 34m1 stop
Multiple Airlines Logo
17:45 - 10:12SYD-DEN
34h 27m1 stop
$1,644Multiple Airlines
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Wed, 24 Dec - Thu, 15 Jan
Qantas Airways Logo
12:39 - 09:00DEN-SYD
26h 21m1 stop
Qantas Airways Logo
11:20 - 12:18SYD-DEN
18h 58m1 stop
$1,734Qantas Airways
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Wed, 11 Feb - Fri, 27 Feb
Alaska Airlines Logo
12:34 - 19:45DEN-SYD
37h 11m2 stops
Alaska Airlines Logo
21:40 - 19:19SYD-DEN
39h 39m2 stops
$1,740Alaska Airlines
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Tue, 24 Feb - Fri, 6 Mar
Alaska Airlines Logo
19:50 - 19:45DEN-SYD
29h 55m2 stops
Alaska Airlines Logo
21:40 - 11:19SYD-DEN
31h 39m2 stops
$1,742Alaska Airlines
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Tue, 3 Mar - Tue, 10 Mar
ANA Logo
11:45 - 20:15DEN-SYD
38h 30m2 stops
ANA Logo
21:45 - 22:49SYD-DEN
42h 04m2 stops
$1,751ANA
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Tue, 10 Feb - Fri, 27 Feb
Delta Logo
06:29 - 08:30DEN-SYD
32h 01m2 stops
Delta Logo
10:40 - 11:32SYD-DEN
18h 52m1 stop
$1,766Delta
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Sat, 7 Feb - Fri, 27 Feb
Delta Logo
07:00 - 06:50DEN-SYD
29h 50m2 stops
Delta Logo
10:40 - 11:32SYD-DEN
18h 52m1 stop
$1,771Delta
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Tue, 11 Nov - Sat, 15 Nov
Qantas Airways Logo
12:55 - 07:25DEN-SYD
24h 30m1 stop
Qantas Airways Logo
17:45 - 12:11SYD-DEN
36h 26m1 stop
$1,803Qantas Airways
Find Deal
Tue, 3 Mar - Mon, 9 Mar
ANA Logo
11:45 - 20:15DEN-SYD
38h 30m2 stops
ANA Logo
21:45 - 22:49SYD-DEN
42h 04m2 stops
$1,841ANA
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $1,526 (return)
Qantas Airways
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 19% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
May
Cheapest • 20% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest return fare
$1,526
Overall average: $1,867
United Airlines
Sat 17/1Sun 1/2
DEN - SYD • 1 stop
Cheapest one-way flight
$618
Typical prices: $1,057-$1,437
Multiple Airlines
Tue 25/11
DEN - SYD • 2 stops
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Sydney!
Booking Insights

KAYAK's insights & trends for Denver to Sydney flights

Get data-powered insights and trends into flights from Denver to Sydney to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Denver to Sydney?

The average price of all round-trip flights from Denver to Sydney clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Sydney on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Tuesday is the most expensive day to fly from Denver to Sydney. For your return ticket, we recommend flying on a Monday and avoiding Fridays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Sydney, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Denver to Sydney is May, where tickets cost $1,315 (return) on average. On the other hand, the most expensive months are December and October, where the average cost of round-trip tickets is $2,304 and $1,995 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Sydney, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Denver to Sydney, you should book around 4 weeks before departure, which saves you about 19% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know

Low seasonSeptember
Cheapest flight$618
Best time to beat the crowds (10% less expensive on average)
Most popular time to fly and prices are also 18% lower on average.
Flight from Denver to Sydney

When to book flights from Denver to Sydney

Are your dates flexible? Find out the best times to travel from Denver to Sydney based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to Sydney

  • Where can I freshen up after my flight to Sydney Airport?

    If you are heading straight to a meeting or just need to freshen up after the flight, you'll find public bathrooms and shower facilities at Sydney Airport (SYD). Head to the international terminal for shower facilities. You'll find them between Mcdonald's and Amcal on Level 2 in T1. Entrance to the showers is chargeable. There are toilets on all three levels of the airport, and the bathrooms usually close at 22:00 and open again at 06:00 each day.

  • What facilities does the airport offer for business travellers?

    As Sydney is regarded as the business hub of Australia, there are many travellers that head to Sydney on business. The airport provides support for these travellers by offering modern meeting and conference rooms at T1 International, fitted with audio-visual equipment for productive meetings. The Kingsford Smith Suite, on Level 3, can be set up for 150 people sitting or standing, so feel free to host presentations or corporate functions here.  

  • What is the cheapest flight from Denver to Sydney?

    In the last 3 days, the lowest price for a flight from Denver to Sydney was $618 for a one-way ticket and $1,526 for a return.

  • Which aircraft models fly most regularly from Denver to Sydney?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Denver to Sydney?

    Star Alliance, and oneworld are the airline alliances operating flights between Denver and Sydney, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Denver to Sydney, Qantas Airways or United Airlines?

    The two airlines most popular with KAYAK users for flights from Denver to Sydney are Qantas Airways and United Airlines. With an average price for the route of $2,038 and an overall rating of 7.5, Qantas Airways is the most popular choice. United Airlines is also a great choice for the route, with an average price of $2,223 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Denver to Sydney?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to Sydney.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to Sydney?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sydney from Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to Sydney?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Sydney with an airline and back to Denver with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to Sydney?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sydney from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Denver to Sydney

  • If you are travelling with young children and need to nurse before getting on your flight to Sydney, you'll find three nursing rooms located just past security at the centre of each concourse. They are open 24 hours a day and have comfortable seating, a changing table, a sink, charging ports and are wheelchair accessible.
  • Denver Airport (DEN) is concerned about eco-travel and has implemented a service that lends to a healthy planet. Along with their robust recycling programs, they have installed water-bottle refill stations throughout the airport, in the hope that fewer plastic bottles will be bought and used only once.
  • A special feature of Denver Airport is the CATS therapy squad. This is a group of volunteers that walk around the airport with their friendly furry friends for about 2 hours at a time, letting passengers pet and interact with the animals. Interacting with a dog or cat is proving to decrease stress levels and increase mental well-being in what can be a stressful environment.

Reviews of the top 3 airlines flying from Denver to Sydney

 
See real verified KAYAK customer reviews for airlines flying from Denver to Sydney. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Sydney? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
Qantas AirwaysOverall score based on 924 reviews
7.7Boarding
7.2Entertainment
8.2Crew
7.5Comfort
7.0Food
Airline reviews

After already paying for excess luggage prior to flight, i was advised AT check in that i had to pay $816 or forfeit my flight! The lady at the counter was SO rude and had already started offboarding me when i said i would pay it after asking her three times for the exact amount! Have lodged a formal complaint yet heard nothing. Will not ever travel via Qantas again

2.0 MediocreR, Oct 2025WLG - BNE
Read more Qantas Airways reviews

After already paying for excess luggage prior to flight, i was advised AT check in that i had to pay $816 or forfeit my flight! The lady at the counter was SO rude and had already started offboarding me when i said i would pay it after asking her three times for the exact amount! Have lodged a formal complaint yet heard nothing. Will not ever travel via Qantas again

A few more inches of legroom is all i ask

One of the best Qantas business flights I've had. Quality product

Business class points redemption - good value for points paid, dubious value if out of your own pocket, domestic class business product okay for this length of flight. The flight left and arrived on time, crew were good, aircraft was a bit old and tired, but still miles ahead of their competitors in Virgin and Jetstar.

Airline running better than post Covid, proper boarding process now implemented, some aircraft feeling a bit old and tired, crew fine, online experience better.

Five hour flight instead of four hours due to westerly headwinds which wasn’t the fault of Qantas !

The wifi was out. Otherwise it was great flight. Richard, as CSM, was excellent.

Was bumped to a later flight because of inefficiency on part of the airline.

The Emerits/Qantas flight was cancelled to Wellington. We need a refund. Had to buy another airline ticket. How do we get the refund. Still not in Wellington.

Delayed QF59 flight once again, Qantas doesn't fail in maintaining there delayed departures and arrivals. USB points do not work nor do the power point sockets on the plane, Qantas staff admitted that on the flight. Don't expect to your charge devices. Saving grace, was the ice cream. Bottom line, if you expect to fly to HND and make it on time avoid Qantas and if you're interested in ice cream - visit 7/11.

Great smooth flight. Had a seating change, but that was an improvement. Thanks United Airways Crew.

Flight was good but there are way to many announcements for credit cards etc.

Crew seemed a bit cranky. No seatback screens. But boarding was efficient and on time and we arrived early.

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Terrible. They wouldn't allow me on my flight on the 14th..

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

The seat and leg room was not good. The food and beverage service was good.

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

Electric plugs didn't work. Entertainment system wasn't working

The flight attendant, a black woman with curly hair who sat near Row 21, was wonderful and kind.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

Flight delayed and missed connection. Rescheduled flight cancelled after 6 hrs wait. Rerouted thru ORD, flight cancelled, overnight stay in ORD. Still in the air on new flight!

We are too tired and frustrated to comment politely at this point

Terrible. Our luggage was delayed and couldn’t be delivered for several days. We got bad information from the airline agents at baggage claim. We had to pick up our car so we wouldn’t be charged for an extra day. We got lost in the maze of airport parking. The baggage claim agents didn’t offer us any compensation for our extra time and expense. We are tired, hungry and very frustrated.

The flight was flawless and we even arrived between 20 and 25 minutes early!

The only thing to like was that we eventually got to our destination

Delayed delayed delayed and no offer for food or vouchers

Disliked having to wait a little longer to disembark from the plan when we landed in London

Everything you need to know for your flight from Denver to Sydney

Information on your arrival and departure airports

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