Boston to Sydney (Mascot) (BOS–SYD) — Airlines, Schedules & Connections

US passport holders must obtain an Electronic Travel Authority (ETA) before boarding. Apply through the Australian ETA app (subclass 601). The ETA costs AUD 20, is valid for 12 months with multiple entries, and allows stays of up to 90 days per visit. Processing is usually instant. Passport must be valid for at least 6 months beyond the date of entry.

MBTA Silver Line SL1 bus runs from South Station (Red Line, Amtrak) through the Ted Williams Tunnel to all Logan terminals; free from the airport, $2.40 inbound. Journey from South Station takes 15–20 minutes depending on traffic. The Blue Line Aquarium station connects to a free water taxi ($12) across the harbor to Logan; scenic but weather-dependent.Taxis from downtown Boston cost $30–45 with the Ted Williams Tunnel toll included. Ride-hails are comparable. The Sumner and Ted Williams tunnels both serve the airport; check traffic before departing, as both frequently back up. Logan is only 3 miles from downtown but tunnel congestion often extends that to 30+ minutes.

Airport Link trains depart every 10 minutes to Central Station (13 min, AUD $20.10 with Opal). The station access fee makes this more expensive than typical Sydney transit. Taxis from International Terminal queue outside arrivals; metered fares to the CBD run AUD $45–65. Uber operates from a designated ride-share zone.Rental car companies have desks in both the international and domestic terminal precincts. A SkyBus operates to the CBD and several suburbs as a cheaper alternative to taxis (AUD $24–27).

Temperate oceanic climate. Summers (December–February) are warm and humid at 24–32°C with afternoon sea breezes and occasional severe thunderstorms that can cause extended ground stops. Winters (June–August) are mild and mostly dry at 8–17°C. Fog on winter mornings occasionally delays operations.

The airport faces its greatest disruption risk from summer thunderstorms and, less commonly, from east-coast lows bringing heavy rain and strong winds in autumn and winter. Pack layers for winter. Summer evenings can be surprisingly cool with sea breezes.