there are restrictions for non-US citizen. I heard of people who were not able to board the plane because they had only one of two doses.
from CDC:Updated Apr. 19, 2023
You must show proof of being fully vaccinated with the primary series of an accepted COVID-19 vaccine before you board your flight to the United States. Only limited exceptions apply.
2 weeks (14 days) after your dose of an accepted single-dose vaccine
2 weeks (14 days) after your second dose of an accepted 2-dose series
2 weeks (14 days) after you received the full series of an accepted COVID-19 vaccine (not placebo) in a clinical trial
2 weeks (14 days) after you received 2 doses of any “mix-and-match” combination of accepted COVID-19 vaccines administered at least 17 days apart*
A person who has received only one dose of an accepted 2-dose series and has recovered from COVID-19 does not meet this definition, and therefore is NOT considered fully vaccinated for travel to the United States.
Single dose
Moderna COVID-19 Vaccine, Bivalent
Pfizer-BioNTech COVID-19 Vaccine, Bivalent
Janssen/J&J
Janssen/J&J
Convidecia (CanSinoBIO)
2-dose series
Novavax
Comirnaty (Pfizer-BioNTech)
Spikevax (Moderna)
Vaxzevria (AstraZeneca)
Covaxin
Covishield
BIBP/Sinopharm
CoronaVac (Sinovac)
Nuvaxovid (Novavax)
Covovax
Medicago
Documentation Type Examples
Verifiable records (digital or paper) Vaccination certificate with QR code1, digital pass via Smartphone application with QR code1 (e.g., United Kingdom National Health Service COVID Pass, European Union Digital COVID Certificate)
Non-verifiable paper records Printout of COVID-19 vaccination record or a COVID-19 vaccination certificate issued at national or subnational level or by an authorized vaccine provider (e.g., the CDC vaccination card)
Non-verifiable digital records Digital photos of vaccination card or record, downloaded vaccine record or vaccination certificate from official source (e.g., public health agency, government agency, or other authorized vaccine provider), or a mobile phone application without QR code1
1. The QR code in a verifiable vaccination record links to information confirming the credential was generated from an immunization record in an official database and is protected from tampering.
All forms of proof of COVID-19 vaccination must have
Personal identifiers (full name plus at least one other identifier such as date of birth or passport number) that match the personal identifiers on the passenger’s passport or other travel documents
Name of official source issuing the record (e.g., public health agency, government agency, or other authorized vaccine provider)
Vaccine manufacturer and date(s) of vaccination