Distance from Boston to Australia: You Can't Measure City-to-Country

The question contains a category error: Boston is a city; Australia is a country (and continent). Distance requires two points.

Meaningful Distances

• Boston (BOS) → Sydney (SYD): ~10,100 mi (16,250 km) great circle; 21+ hours flying (1–2 stops)
• Boston → Melbourne (MEL): ~10,350 mi (16,650 km)
• Boston → Perth (PER): ~11,500 mi (18,500 km) — longest commercial route from BOS
• Boston → Darwin (DRW): ~9,800 mi (15,770 km) — closest Australian capital

Flight Reality

• No nonstop BOS–Australia (range > 9,000 nm exceeds most aircraft)
• Typical routings: BOS → LAX/SFO/YVR → SYD/MEL/BNE
• Or: BOS → DXB/DOH/SIN/HKG → Australia
• Total travel: 24–30+ hours

If You Meant "From US to Australia"

Shortest US–Australia: Honolulu (HNL) → Sydney (SYD) ~5,060 mi (8,140 km), 10h nonstop.