Singapore to Dulles (SIN–IAD) — Airlines, Schedules & Connections

Singapore is part of the US Visa Waiver Program. Singaporean passport holders can enter the United States for up to 90 days without a visa, but must obtain an approved ESTA (Electronic System for Travel Authorization) before boarding. Apply at the official CBP site. ESTA costs USD 21, is valid for 2 years, and covers multiple entries. Passport must be valid for at least 6 months beyond the planned stay. The 90-day limit cannot be extended, and overstaying voids future ESTA eligibility.

MRT East West Line (Changi Airport branch) connects the airport to the city in 30–45 minutes from City Hall or Raffles Place (S$2.20–2.50 with EZ-Link). Trains run from 5:31am to 11:18pm (T1/T2/T3). Terminal 4 is served by a dedicated shuttle bus from T2.Taxis from Orchard Road cost S$20–35 and take 20–30 minutes. Grab is widely used and slightly cheaper. Airport surcharges apply for taxis departing from the city to the airport (S$3–5 depending on peak hours). The trip is short; Singapore's island geography keeps distances manageable.

Silver Line Metro runs from Washington Dulles Airport station to Metro Center in about 65 minutes (~$7). The route bypasses I-66 and I-495 congestion entirely. Washington Flyer coach also runs to Wiehle-Reston East station ($6, 15 min) for Metro connection.Taxis and ride-shares to downtown DC cost $55–80 and take 35–55 minutes depending on traffic. Car rental facilities are on-site. Dulles is 27 miles west of the Capitol; it is farther than either DCA or BWI from central DC.

Humid continental climate. Summers are hot and muggy (30–36°C) with frequent afternoon thunderstorms that cause delays June through August. Winters bring cold temperatures (−3 to 5°C) with snow and ice. The Virginia suburbs accumulate more snow than downtown DC, and ice storms are the primary disruption risk.

Dulles sits at higher elevation in Virginia's piedmont and sees more winter precipitation than DCA. Spring and fall are variable. Snowfall is possible into April. Thunderstorms begin from April through May.