Cheapest return flights from Boston to Sydney in August from $1230
AirHint found the following cheapest return flights from Boston (BOS) to Sydney (SYD) in August 2025 (see full year).
Return flights
| 15 Aug - 22 Aug | Air Canada | ||
| 25 Aug - 07 Sep | United | ||
| 26 Aug - 09 Sep | Delta | ||
| 25 Aug - 09 Sep | Delta |
Also check the deals for one-way flights from Boston to Sydney in August.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
