Best time to go: what is the RIGHT price for a round-trip flight to Saint Lucia (Castries) (from: Sydney)

The average price to go to Saint Lucia (Castries) from Sydney airport is $ 2416 (round trip). However, there are variations depending on the departure month. Thus, it is possible to pay for your plane ticket on average between $ 1887 (in march) and $ 3119 (in december), which is a saving of $ 530 or a surplus of $ 703 (compared to the average price) depending on the period you leave.

The analysis of all prices reveals that the most frequent price is between $2015 to $2067 and it is generally more economical to leave on a tuesday and return on a wednesday on a flight with 1 or more layovers.

Be careful, the cheapest months may correspond to unfavorable weather periods . Check out our page best time to go to Saint Lucia (Castries) before booking your flight.

If you want to know when to book your flight at the best price, go straight to the second part of this page: When to buy your Sydney-Saint Lucia (Castries) plane ticket.

How are these data calculated?

We have studied a sample of 2149 airfare prices from previous years for flights to Saint Lucia (Castries) from Sydney and can thus establish precise and credible price variation trends based on different parameters. Of course, prices can vary from year to year, but the seasonal aspect of this data (recurrence of school holidays, events... from year to year) makes these statistics quite reliable.

Average price depending on the departure month

Data analysis:

By leaving in march, the price of the plane ticket will statistically be the cheapest ($ 1887, saving $ 530 compared to the average price over the year which is $ 2416). Conversely, december will be the most expensive ($ 3119).

Flight Sydney-Saint Lucia (Castries): when is the best time to go for the best price?

Month Good price* Average price Our opinion
January$ 2018 $ 2588 fair price
February$ 1778 $ 2199 good price
March$ 1651 $ 1887 very good price
April$ 1906 $ 2396 fair price
May$ 1802 $ 2290 fair price
June$ 1881 $ 2285 fair price
July$ 2292 $ 2685 fair price
August$ 2272 $ 2710 fair price
September$ 1866 $ 2557 fair price
October$ 1910 $ 2180 good price
November$ 1681 $ 2097 good price
December$ 2716 $ 3119 very high price

*great price to buy your plane ticket: if you see this price or cheaper during your flight search, go for it and buy it!

Price breakdown to travel from Sydney to Saint Lucia (Castries)

Data analysis:

The prices for flights from Sydney to Saint Lucia (Castries) range from $1343 to $3152. 2% of tickets were purchased at the minimum price (from $1344 to $1395), 1% at the maximum price (from $3100 to $3152). The majority of plane tickets were purchased in the range of $2015 to $2067 (5% of tickets).

Cheapest airlines for the Sydney->Saint Lucia flight

There are 6 companies that serve Sydney from Saint Lucia (Castries) airport: British Airways, Jetstar, Qantas, Air Canada, Hawaiian Airlines and Asiana Airlines.

Data analysis:

Of the 2149 flights analyzed in previous years, British Airways was the airline that offered the best fare most often in the flight ticket search results (47% of the time) on the Sydney->Saint Lucia route.

Which day of the week to leave?

Data analysis:

Statistically, Sydney-Saint Lucia (Castries) flights departing on a tuesday are cheaper than on other days of the week. By choosing a tuesday as your departure date, you can save an average of $115. On the other hand, departing on a saturday may cost you an additional $171.

Which day of the week to come back?

Data analysis:

Statistically, return flights from Saint Lucia (Castries) to Sydney departing on a wednesday are cheaper than on other days of the week. By choosing a wednesday for your return date, you will save an average of $203. Conversely, departing from Saint Lucia (Castries) on a friday may cost you an additional $188.


Top prices Sydney-Saint Lucia (Castries)

Round tripDatesPrice
Sydney → Castries12-02 to 19-02-2025$ 1998 
Sydney → Castries19-03 to 26-03-2025$ 1407 
Sydney → Castries12-05 to 18-05-2025$ 1723 
Sydney → Castries10-07 to 18-07-2025$ 3362 
Sydney → Castries01-09 to 17-09-2025$ 1810 
Sydney → Castries15-09 to 21-09-2025$ 1705 
Sydney → Castries01-01 to 15-01-2026$ 3718 


When to book your flight Sydney - Saint Lucia (Castries) to get the cheapest price?

Statistically, you will make the biggest savings by buying your plane ticket between 8 to 9 months in advance. However, you may end up paying a high price if you book between 0 to 1 month in advance.

Did you know: the price of plane tickets not only varies depending on how far in advance you book, but also on the day of the week you book! So, to maximize your chances of getting the best price for a Sydney-Saint Lucia flight, it is recommended to book your ticket on a tuesday.

How far in advance should I buy my flight?

Data analysis:

To get the cheapest flight ticket from Sydney to Saint Lucia (Castries), it is recommended to buy it 8 to 9 months before departure (it is then on average 2150 $, which is a saving of 266 $ compared to the overall average price). On the other hand, if you buy your ticket 0 to 1 month in advance, you will pay the full price (168 $ more than the average price).

Depending on the departure month

The best time to buy your Sydney to Saint Lucia (Castries) flight ticket may vary depending on your departure month. Therefore, we offer you statistics on when to book your flight month by month.

Departure on... How far in advance should I book?
January

Best time: 1 to 2 months before departure (average price: 2473 $)

February

Best time: 1 to 2 months before departure (average price: 2185 $)

March-
April-
May-
June-
July-
August-
September-
October-
November

Best time: 0 to 1 month before departure (average price: 2040 $)

Other interesting period(s): 1 to 2 months ($ 2042)

December-

What day of the week should I book my flight ticket?

Data analysis:

Statistically, tuesday is the day when plane tickets for Sydney->Saint Lucia are the cheapest. So, by buying your plane ticket on a tuesday, you will save $58. Conversely, by buying it on a monday, you may end up paying $117 more.



Sydney to Saint Lucia (Castries): flight price when booking today

Information: this data is not statistics but comes from real prices collected less than 7 days ago. Some months may not be available as we do not have enough data for them.

Month Current price
February 2025$ 1998
$1998 to $1998
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March 2025$ 1422
$1394 to $1475
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May 2025$ 1723
$1723 to $1723
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July 2025$ 3362
$3362 to $3362
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September 2025$ 1758
$1705 to $1810
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January 2026$ 3718
$3718 to $3718
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Data analysis:

Compared to the average price, february, march, may and september are cheaper to travel to Saint Lucia (Castries). So it may be interesting to book now to leave during these months!



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