Jetstar’s birthday sale is usually in May , not August or November. A 2023 article says the 19th birthday sale happened on 12 December 2023 , but multiple later sources say Jetstar’s birthday sale typically runs in May , including the 2022 sale starting 4 May 2022 and the 2026 sale beginning 4 May 2026.

What that means for 2021

For 2021 , the birthday sale appears to have been around early May as well. One deal archive shows an expired Jetstar birthday sale with a final day of 4 May 2021.

Best read on your query

If you’re asking “was Jetstar birthday sale in November or August 2021?”, the available results do not support that; the pattern points to May instead.

If you’re looking for a specific 2021 promo date, the clearest match found is 4 May 2021.

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YearObserved birthday sale timing
2021Final day shown as 4 May 2021
2022Started 4 May 2022
2023Birthday sale on 12 December 2023
2025Most recent sale was in May 2025
2026Sale began 4 May 2026
TL;DR: **Jetstar birthday sale was most likely in May 2021, not August or November**.