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$541+ Cheap flights from Key Largo, FL 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SYD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Sydney Kingsford Smith are usually found in August or May, booked 20 days in advance, depart on a Sunday or Tuesday and return on a Friday

Cheap flight deals from Key Largo to Sydney

Keep the following information in mind while searching for Key Largo to Sydney flight deals. Data was last updated September 15, 2025.

Round-trip from

$1,053
(Trip.com)

One-way from

$541
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,511
From Key Largo to Sydney Kingsford Smith
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One-way flight from Key Largo to Sydney Kingsford Smith
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Highest demand for flights based on searches. 23% potential increase in price ($462 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($81 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 Key Largo to Sydney

Cheapest flights from Key Largo to Sydney
Explore the most affordable flight options available from Key Largo to Sydney. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Trip.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/205:15 amMIA - SYD
2 stops35h 50mMultiple Airlines
Mon 10/271:05 pmSYD - MIA
2 stops26h 29mMultiple Airlines
Deal found 9/14$1,053
This oojo deal was found by Cheapflights users on 9/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:35 pmMIA - SYD
2 stops26h 10mFiji Airways
Tue 11/42:10 pmSYD - MIA
2 stops23h 06mFiji Airways
Deal found 9/13$1,205
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/35:35 pmMIA - SYD
2 stops26h 55mFiji Airways
Tue 11/182:10 pmSYD - MIA
2 stops23h 06mFiji Airways
Deal found 9/14$1,252
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/35:35 pmMIA - SYD
1 stop23h 25mQantas Airways
Tue 11/186:20 amSYD - MIA
2 stops23h 44mQantas Airways
Deal found 9/14$1,254
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/237:35 pmMIA - SYD
2 stops26h 40mFiji Airways
Thu 11/66:00 amSYD - MIA
2 stops31h 16mFiji Airways
Deal found 9/14$1,262
This BestPriceTravel deal was found by Cheapflights users on 9/14. 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 BestPriceTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2911:55 amMIA - SYD
2 stops31h 35mAir New Zealand
Wed 11/59:55 amSYD - MIA
2 stops25h 57mAir New Zealand
Deal found 9/14$1,269
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/282:52 pmMIA - SYD
1 stop25h 33mQantas Airways
Tue 11/46:20 amSYD - MIA
2 stops23h 44mQantas Airways
Deal found 9/13$1,307
This Fiji Airways deal was found by Cheapflights users on 9/13. 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 Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/287:35 pmMIA - SYD
2 stops26h 10mMultiple Airlines
Tue 11/42:10 pmSYD - MIA
2 stops23h 06mMultiple Airlines
Deal found 9/13$1,308
This oojo deal was found by Cheapflights users on 9/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/244:56 pmMIA - SYD
2 stops26h 34mAir New Zealand
Mon 11/311:45 amSYD - MIA
2 stops24h 07mAir New Zealand
Deal found 9/15$1,310
This Fiji Airways deal was found by Cheapflights users on 9/13. 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 Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/65:30 pmMIA - SYD
2 stops27h 30mMultiple Airlines
Thu 11/202:00 pmSYD - MIA
2 stops22h 59mMultiple Airlines
Deal found 9/13$1,311
This oojo deal was found by Cheapflights users on 9/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/307:34 pmMIA - SYD
2 stops36h 36mFiji Airways
Tue 10/146:00 amSYD - MIA
2 stops31h 46mFiji Airways
Deal found 9/14$1,320

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo 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 15, 2025.
Use the filters below to find and compare flights from Key Largo to Sydney that are best for you.

Fly from

Key Largo

Fly to

Sydney

Route

Depart

Return

Price

MiamiSydney

MIA - SYD

MIASYD

Miami

Mon 11/3

5:35 pm-9:00 am

1 stop23h 25m

Sydney Kingsford Smith

Tue 11/18

6:20 am-2:04 pm

2 stops23h 44m

$1,254

MiamiSydney

MIA - SYD

MIASYD

Miami

Tue 10/28

7:35 pm-12:45 pm

2 stops26h 10m

Sydney Kingsford Smith

Tue 11/4

2:10 pm-9:16 pm

2 stops23h 06m

$1,308

MiamiSydney

MIA - SYD

MIASYD

Miami

Thu 11/6

5:30 pm-1:00 pm

2 stops27h 30m

Sydney Kingsford Smith

Thu 11/20

2:00 pm-8:59 pm

2 stops22h 59m

$1,311

MiamiSydney

MIA - SYD

MIASYD

Miami

Wed 11/26

4:47 pm-7:55 pm

2 stops35h 08m

Sydney Kingsford Smith

Sun 12/14

9:45 am-10:05 pm

2 stops28h 20m

$1,330

MiamiSydney

MIA - SYD

MIASYD

Miami

Wed 11/26

5:30 pm-2:50 pm

2 stops29h 20m

Sydney Kingsford Smith

Sun 12/14

2:05 pm-2:12 pm

1 stop40h 07m

$1,342

MiamiSydney

MIA - SYD

MIASYD

Miami

Tue 10/14

7:35 pm-10:10 pm

2 stops35h 35m

Sydney Kingsford Smith

Sun 11/2

5:00 am-9:59 pm

2 stops31h 59m

$1,419

MiamiSydney

MIA - SYD

MIASYD

Miami

Sat 11/1

6:49 pm-12:30 pm

2 stops26h 41m

Sydney Kingsford Smith

Fri 11/14

2:00 pm-5:13 am

2 stops31h 13m

$1,433

MiamiSydney

MIA - SYD

MIASYD

Miami

Tue 10/14

6:35 pm-7:55 am

1 stop22h 20m

Sydney Kingsford Smith

Sun 11/2

9:55 am-10:58 pm

2 stops28h 03m

$1,442

MiamiSydney

MIA - SYD

MIASYD

Miami

Thu 11/6

9:00 am-8:45 am

2 stops31h 45m

Sydney Kingsford Smith

Thu 11/20

11:45 am-9:58 pm

2 stops26h 13m

$1,448

MiamiSydney

MIA - SYD

MIASYD

Miami

Tue 10/14

6:49 pm-12:45 pm

2 stops26h 56m

Sydney Kingsford Smith

Tue 10/21

2:15 pm-12:49 am

2 stops25h 34m

$1,481

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 20 results
1
2

Best time to book a flight from Key Largo to Sydney

Have a flexible travel schedule? Discover the best time to fly to Sydney from Key Largo 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 Key Largo to Sydney

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Sydney. Price data was last updated on September 12, 2025.

The best time to book flights from Key Largo to Sydney is 20 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, March is the cheapest month in which you can book a flight from Key Largo to Sydney (average of $1,032). Flying from Key Largo to Sydney in December is currently the most expensive (average of $1,627). 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 KE9 to SYD?

Find hourly flight availability from Key Largo 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 15, 2025.

When flying from Key Largo to Sydney, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Key Largo to Sydney?

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

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

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 15, 2025.
Peruse reviews from past customers who have flown with Delta, Qantas Airways, and United Airlines from Key Largo to Sydney to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Qantas Airways
7.5
Good
905 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Comfort

7.9

Overall

8.0

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

Related info for your journey

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

  • What airport do you fly into for flights to Sydney from Key Largo?

    If you book a flight to Sydney from Key Largo, you will be flying to Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 4.6 mi from the center of Sydney. There are 0 flights from Key Largo to Kingsford Smith per day from 7 different airlines.

  • How long is the flight from Key Largo to Sydney?

    Airlines like Qantas Airways fly from Key Largo to Sydney in about 23h 25m. The time it takes to get you to your destination can typically vary by up to . Key Largo and Sydney are separated by a distance of 9328 mi.

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

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

  • How can I find direct flights from Key Largo to Sydney?

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

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

    Yes. Cheapflights offers flight deals from Key Largo 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 Key Largo to Sydney?

    Currently, March is the cheapest month in which you can book a flight from Key Largo to Sydney (average of $1,032). Flying from Key Largo to Sydney in December is currently the most expensive (average of $1,627). 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

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Top 7 airlines flying from Key Largo to Sydney

Discover the top 7 airlines that operate flights from Key Largo 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$413Average$1,113FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$850Average$1,386FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$866Average$1,233FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$946Average$1,703FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$946Average$1,052FlexibilityNo cancel feeOn-time67%
Air New ZealandCheapest$1,081Average$1,656FlexibilityNo cancel feeOn-time78%
Qantas AirwaysCheapest$1,306Average$1,768FlexibilityNo cancel feeOn-time74%

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