AirHint found the following cheapest return flights from Washington (DCA) to Sydney (SYD) in May 2026 (see full year).
Return flights
| 15 May - 31 May | Air Canada | ||
| 16 May - 31 May | Air Canada | ||
| 18 May - 25 May | Qantas | ||
| 24 May - 06 Jun | Qantas | ||
| 30 May - 12 Jun | Alaska Airlines | ||
| 22 May - 29 May | Qantas |
Also check the deals for one-way flights from Washington to Sydney in May.
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