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$426+ 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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SYD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$790
(Expedia)

One-way from

$426
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$1,406
Provider with most accurate pricing for Miami-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Miami-Sydney Kingsford Smith flights.
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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. 22% potential increase in price ($426 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($83 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 30, 2025.

This Expedia deal was found by Cheapflights users on 10/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/198:00 amMIA - SYD
2 stops33h 35mAir Canada
Wed 11/2611:20 amSYD - MIA
2 stops51h 09mAir Canada
Deal found 10/28$790
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/26:00 pmMIA - SYD
1 stop23h 15mUnited Airlines
Mon 11/1011:50 amSYD - MIA
1 stop24h 02mUnited Airlines
Deal found 10/28$851
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:00 pmMIA - SYD
1 stop23h 15mUnited Airlines
Mon 12/1512:10 pmSYD - MIA
1 stop25h 35mUnited Airlines
Deal found 10/28$854
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:00 pmMIA - SYD
1 stop23h 15mUnited Airlines
Thu 12/411:50 amSYD - MIA
1 stop19h 45mUnited Airlines
Deal found 10/28$857
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/279:00 amMIA - SYD
2 stops32h 15mUnited Airlines
Mon 12/2211:20 amSYD - MIA
2 stops27h 20mUnited Airlines
Deal found 10/28$859
This Air Canada deal was found by Cheapflights users on 10/28. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/16:40 pmMIA - SYD
1 stop44h 15mAir Canada
Thu 12/1111:20 amSYD - MIA
2 stops41h 14mAir Canada
Deal found 10/28$883
This Air Canada deal was found by Cheapflights users on 10/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/263:45 pmMIA - SYD
2 stops25h 50mMultiple Airlines
Wed 12/249:00 amSYD - MIA
2 stops24h 39mMultiple Airlines
Deal found 10/29$971

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 October 30, 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

4:50 pm-7:00 am

1 stop22h 10m

Sydney Kingsford Smith

Tue 11/18

11:20 am-7:52 pm

2 stops24h 32m

$856

MiamiSydney

MIA - SYD

MIASYD

Miami

Wed 11/19

7:40 am-8:30 am

1 stop32h 50m

Sydney Kingsford Smith

Wed 11/26

10:40 am-5:33 pm

1 stop22h 53m

$1,061

MiamiSydney

MIA - SYD

MIASYD

Miami

Wed 11/26

4:50 pm-7:00 am

1 stop22h 10m

Sydney Kingsford Smith

Sun 12/14

2:00 pm-9:45 pm

1 stop23h 45m

$1,062

MiamiSydney

MIA - SYD

MIASYD

Miami

Mon 11/24

6:00 am-8:30 am

2 stops34h 30m

Sydney Kingsford Smith

Mon 12/8

10:40 am-10:14 pm

2 stops27h 34m

$1,066

MiamiSydney

MIA - SYD

MIASYD

Miami

Wed 1/21

10:33 am-8:30 am

2 stops29h 57m

Sydney Kingsford Smith

Mon 1/26

10:40 am-6:20 pm

2 stops23h 40m

$1,067

MiamiSydney

MIA - SYD

MIASYD

Miami

Sun 12/7

8:30 am-9:15 am

1 stop32h 45m

Sydney Kingsford Smith

Fri 12/12

11:50 am-5:53 pm

1 stop22h 03m

$1,137

MiamiSydney

MIA - SYD

MIASYD

Miami

Sun 1/18

7:50 am-6:50 am

1 stop31h 00m

Sydney Kingsford Smith

Sat 2/7

10:40 am-5:55 pm

1 stop23h 15m

$1,137

MiamiSydney

MIA - SYD

MIASYD

Miami

Tue 11/4

4:50 pm-7:00 am

1 stop22h 10m

$426

MiamiSydney

MIA - SYD

MIASYD

Miami

Thu 11/6

9:00 am-9:05 am

2 stops32h 05m

$433

MiamiSydney

MIA - SYD

MIASYD

Miami

Wed 11/26

7:17 am-8:15 pm

2 stops44h 58m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 18 results
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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 October 24, 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, June is the cheapest month in which you can book a flight from Key Largo to Sydney (average of $538). Flying from Key Largo to Sydney in January is currently the most expensive (average of $1,246). 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 October 30, 2025.

When flying from Key Largo to Sydney, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 20% versus a flight at noon.

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 October 30, 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
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
925 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
8,996 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
11,034 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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
10,383 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

7.9

Crew

8.5

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 United Airlines and Delta fly from Key Largo to Sydney in about 22h 10m. The time it takes to get you to your destination can typically vary by up to 10h 40m. Key Largo and Sydney are separated by a distance of 9328 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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, June is the cheapest month in which you can book a flight from Key Largo to Sydney (average of $538). Flying from Key Largo to Sydney in January is currently the most expensive (average of $1,246). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$413Average$1,113FlexibilityNo cancel feeOn-timeN/A
Fiji AirwaysCheapest$850Average$1,385FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$864Average$1,228FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$946Average$1,654FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$946Average$1,032FlexibilityNo cancel feeOn-time67%
Air New ZealandCheapest$1,081Average$1,666FlexibilityNo cancel feeOn-time78%
Qantas AirwaysCheapest$1,286Average$1,763FlexibilityNo cancel feeOn-time74%

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