Embassy
Embassy of the United States in San Salvador
San Salvador
Final Boulevard Santa Elena
American citizens do not need a visa for El Salvador. Show your passport at the border and stay up to 180 days.

USA
United States
SLV
El Salvador
No visa needed
People with Category A passports can visit without a visa.
CA-4 visas cover four countries with a shared time limit
Check your passport is valid for the whole stay, ideally six months beyond it.
Carry proof of onward travel and of funds; border officers can ask for both.
Note the maximum stay and count your days in El Salvador.
Your passport and other visas decide which route you can use.
How to apply
Documents required
How to apply
Documents required
How to apply
Documents required
How to apply
For lost passports and emergencies.
Embassy
San Salvador
Final Boulevard Santa Elena
Best time to go: The dry season runs from November to April. The rainy season runs from May to October. The coast is warm, while mountain areas are cooler.

El Salvador is the smallest Central American republic by area, lying on the Pacific coast.
Going to El Salvador
Places close to El Salvador with simpler entry for you.
CA-4 visa rules cover El Salvador, Guatemala, Honduras and Nicaragua. The source does not say whether Americans need a visa.
American citizens do not need a visa for El Salvador. Show your passport at the border and stay up to 180 days.
Up to 180 days each visit with the no visa needed rule. Staying longer can mean a fine or a ban from coming back.
Salvadoran citizens need a visa for the United States, from its embassy or consulate.
Antigua and Barbuda, Argentina, Bahamas, Barbados Belize, and 5 more can enter without applying before they travel.
Belize, Costa Rica, Guatemala, Honduras Nicaragua, and 3 more let american citizens in without applying before travel.
Check your passport is valid for the whole stay, ideally six months beyond it. Carry proof of onward travel and of funds; border officers can ask for both.
United States dollar ($). Carry some cash for arrival, especially if a visa fee is paid at the border.
Spanish.
It ranks #12 and reaches 150 destinations without applying ahead.
Reviewed by @snuck