What you need to know

•                    Postpone your trip until you are fully vaccinated.
•                    Check the COVID-19 situation at your destination before you travel. State, local, and territorial governments may have travel restrictions in place.
•                    It is mandatory to wear a mask that covers your nose and mouth in closed areas of public transportation (including airplanes) and within transportation hubs (including airports).
•                    Do not travel if you have been exposed to COVID-19, are ill, or have a positive COVID-19 test.
•                    If you are not fully vaccinated and must travel, get screened before and after the trip.

Before travelling: 

• Check the current COVID-19 situation at your destination.
• It is important that you are aware of and follow all state, local, and territorial travel restrictions, including requirements for the use of masks, vaccination certificates, screening tests, or quarantine. 
• If you are traveling by plane, check if your airline requires documentation of screening tests, vaccination or other documents.
• Be prepared to be flexible during your trip as restrictions and policies may change during your trip.
•    RECOMMENDED
• If you are NOT fully vaccinated, take a viral test 1 to 3 days before you travel.

During the trip

• Mask use: in most destinations Wearing a mask that covers your mouth and nose is mandatory in enclosed spaces of public transportation (including airplanes, buses, trains, and other forms of public transportation)

• Follow all state and local health recommendations and requirements for your duty station, including wearing a mask and keeping a distance of 6 feet (2 meters) from other people.
• Travelers 2 years of age and older should wear masks in closed public places if: 
• In areas with a high number of COVID-19 cases In areas with a high number of COVID-19 cases with other people who do not have the full vaccination schedule, such as a festival or outdoor sporting event.
• Wash your hands often or use hand sanitizer (with at least 60 % of alcohol).

After traveling

You may have been exposed to COVID-19 on your travels. You may feel fine and have no symptoms, but you can still spread the virus and spread it to other people. People who are not fully vaccinated are more likely to contract COVID-19 and spread it to other people. For this reason, the CDC recommends taking the following precautions after returning from a trip.

ALL travelers

   RECOMMENDED

• Be attentive to the appearance of symptoms of COVID-19; Isolate yourself and get screened for an external site icon if you have symptoms.
• Follow all state and local recommendations or requirements after your trip.

If you are NOT fully vaccinated

   RECOMMENDED

Serve a quarantine and get screened after the trip:

• Get a viral test 3 to 5 days after you return. 
• Stay home in quarantine for 7 daysfull after traveling, evenif your test result is negative after 3-5 days.
• If you don't get a screening test, stay home quarantined for 10 days after traveling.

Fuente: https://espanol.cdc.gov/coronavirus/2019-ncov/travelers/travel-during-covid19.html