Hoa Kỳ: cần biết gì trước chuyến đi

Nhập cảnh và thị thực

UK and most EU citizens use the Visa Waiver Program: ESTA (USD 40.62, valid 2 years or until passport expiry) for stays up to 90 days. Russia, Belarus, Kazakhstan, Uzbekistan, Ukraine, China, India, Turkey and UAE citizens need a B1/B2 visa (USD 185 application fee). A USD 250 'visa integrity fee' is legislated but, as of late Oct 2026, not yet collected. Chinese 10-year visa holders must update EVUS (USD 31.75).

Tờ khai và giấy phép trực tuyến

• ESTA (Electronic System for Travel Authorization) ↗ bắt buộc
  At least 72 hours before departure (ideally when booking) · Phí: USD 40.62 (from 16 Oct 2026) · Visa Waiver Program nationals (UK, most EU, etc.)
• EVUS ↗ bắt buộc
  Before travel; valid 2 years or until visa/passport expiry · Phí: USD 31.75 · Chinese passport holders with a 10-year B1/B2 visa

Thời hạn hộ chiếu: Valid for the whole stay (VWP travellers need an e-passport). Many nationalities need 6 months beyond the stay.

Tại cửa khẩu có thể được hỏi

• Fingerprints and photo taken; answer questions about purpose, address and return ticket.
• Check your I-94 record online after entry to confirm your admitted-until date.
• Officers may examine electronic devices.

Hải quan

• Declare cash or monetary instruments over USD 10,000.
• Declare all food, plants and animal products; meat, fresh fruit and many dairy items are prohibited — undeclared items bring fines.
• Don't bring cannabis or CBD products, even if legal at origin or destination state.
• Prescription medicines in original containers; carry the prescription.

Kiểm tra ngày 29 tháng 10, 2026 · Nguồn: esta.cbp.dhs.gov ↗, travel.state.gov ↗, cbp.gov ↗, gov.uk ↗, govinfo.gov ↗

Tiền

Hầu như nơi nào cũng trả bằng thẻ. Thẻ được chấp nhận hầu như khắp nơi.

Mạng thanh toán: Visa, Mastercard, Amex, Diners, JCB, UnionPay

Apple Pay — dùng được · Google Pay — dùng được

Nơi nên đổi tiền

• Withdraw USD from bank ATMs (Chase, Bank of America, Wells Fargo, etc.) with a low-fee card
• Pay by card everywhere — most places are cashless-friendly

Nơi không nên đổi

• Airport currency kiosks
• Exchanging cash at US banks (often only for account holders, poor rates)
• Dynamic currency conversion

Cây ATM: ATM owners charge USD 3–6 per withdrawal plus your bank's fee; stand-alone ATMs in shops/bars charge the most.

Tiền boa: Expected: 18–22% at sit-down restaurants and bars (USD 1–2 per drink), 15–20% taxis/rideshare, USD 2–5/night housekeeping. Sales tax is added at checkout, not shown on price tags.

• Mir and other Russian-issued cards don't work.
• Some shops and vending/transit systems are card-only; tap-to-pay works on many transit networks (e.g. NYC OMNY).

Kiểm tra ngày 29 tháng 10, 2026 · Nguồn: cbp.gov ↗, usa.gov ↗, support.apple.com ↗

Văn hóa và trang phục

Tôn giáo: Predominantly Christian with large secular and diverse faith communities; no state religion.

Trang phục: Casual almost everywhere; smart-casual for upscale restaurants. Indoor spaces are heavily air-conditioned — bring a layer.

Phép lịch sự

• Tip service staff — wages rely on it.
• Queue in line and respect personal space.
• Small talk and friendliness are normal; 'How are you?' is a greeting.
• Avoid politics with strangers.

Kiểm tra ngày 29 tháng 10, 2026 · Nguồn: gov.uk ↗

Khí hậu

Huge variety: cold snowy winters in the north and Midwest, mild Pacific coast, hot humid South and Florida (hurricane season Jun–Nov), desert Southwest very hot in summer.

Mùa đẹp nhất: April–June and September–October for most regions; winter for Florida, Hawaii and the Southwest.

Kiểm tra ngày 29 tháng 10, 2026 · Nguồn: weather.gov ↗, nhc.noaa.gov ↗

Nên mang

• US plug adapter (type A/B); check devices support 120 V
• Printed/stored ESTA or visa details and return ticket
• Insurance documents
• Layers for air-conditioning
• Credit card for car rentals and hotel deposits

Không nên mang / cấm mang vào

• Meat, fresh fruit, plants and seeds
• Cannabis or CBD products
• Kinder Surprise eggs (banned)
• Large knives or pepper spray in carry-on

Thông tin thiết thực

Ổ cắm: Type A/B, 120 V, 60 Hz

Nước: Tap water is safe to drink almost everywhere.

Giao thông: đi bên phải

Di động và eSIM: Prepaid SIM/eSIM from T-Mobile, AT&T or Verizon (and MVNOs) without ID in many stores; free Wi-Fi is common.

Ứng dụng: Uber, Lyft, Google Maps, Transit, OpenTable, Yelp, Mobile Passport Control

Internet: No restrictions.

Sức khỏe: No compulsory vaccinations for visitors. Medical costs are very high; emergency rooms must treat but will bill heavily.

Bảo hiểm: Not required for entry but essential; choose high medical limits and evacuation cover.

Khẩn cấp: 911 — police, fire, ambulance

Kiểm tra ngày 29 tháng 10, 2026 · Nguồn: gov.uk ↗, cbp.gov ↗