Santiago's air quality can decline during the winter (May-September). The locals welcome the rain which falls during winters as it cleans the air. Be sure to carry bottled water with you during the summer and avoid food or drink from street vendors. Be prepared for sauna-heat on the metro during summer.
By South American standards Santiago is a safe city, but visitors should be aware of pickpocketing and other petty crimes. Avoid parks at night and don't wear expensive looking jewelry or watches even during the day. If you're alone, avoid large crowds of people, especially downtown.
If you happen to have bad luck and get robbed, do as you're told by the criminal and if you don't understand Spanish, give away your false wallet. Thieves in Chile are often impatient and don't read very well. They are likely to beat the bejeezus out of you if you don't give them something that at least appears to be valuable.
Don't flash your cell phone or camera. Carefully hide such valuable when not using them. If you're getting robbed and the criminal has spotted the camera expect to give it away too if you want to stay out of the hospital.
Do always count your money out loud to taxi drivers before handing, as they don't have the best reputation.
If someone approaches you on the streets and promises to get you better chances at changing your dollars/euros into Chilean pesos, NEVER accept their deals. They're con-people who take advantage of foreigners not knowing the details about currency and confuse them with big words to take their cash away. Only change your money in legal currency exchange centers, which may take more time but are much more trustworthy. There's one in the Airport but it has poor exchange rates, and there are many more downtown and in financial areas or in the malls.
If you are going to see a football match (soccer game), be careful with the "barras bravas" who are the most fanatic but also dangerous fans. They are often involved in troubles with the police both inside the stadium and outside. Avoid buying tickets in the sections where the bravas dominate which it often does behind the goals. The middle section is the safest but if you have a friend who wants to support Colo-Colo and another Universidad de Chile, for example, avoid showing it. Even if the middle section is safe, showing different shirts can cause you trouble. Either go with the same shirts or dress neutral. Other football matches not being the "Superclásico" between Universidad de Chile against Colo-Colo should be pretty safe. Walking to the stadium you will find people begging for some pesos so they can see the match. Avoid giving them if you want to stay out of trouble. The barrio where the Estadio Nacional is located in a place which is normally peaceful, except during football matches, when football fans tend to get rounded up. You have to walk with precaution and keep your eyes on other people when it's crowded. It's better to take a taxi to the arena, or a rental car if you can find a place to park it (but beware of break-ins).
There are some neighborhoods/barrios that should be avoided. Even if few carabineros and locals speak English, they are the ones who know which areas are to be avoided since some of them are accessible by metro. If you see fewer tall buildings and more houses with barred windows and entrances, then turn back. The changes happen very slowly, unlike some other Latin American cities, so you'd have to travel quite a lot from a wealthy safe neighborhood to a dangerous ghetto. Avoid especially La Legua (not to be confused with La Ligua in the V Región or La Lengua on sale at the carnicería) which is famed in Chile for its high crime rates and single police cars won't even enter the area. When police have to enter this area they sometimes use armored cars. When it comes to nightlife, keep an eye on your surroundings if you go to Bellavista. Some parts of it are frequented place by criminals and fights involving stabbed people sometimes happen on public streets. This happens mostly on the western side of the neighborhood; the half east of Pio Nono is usually safer, albeit less interesting.
Try staying away from the following comunas: Lo Espejo, La Pintana, Puente Alto (especially the Plaza de Armas), La Cisterna, San Joaquín, El Bosque (not to be confused with a neighborhood located around metro El Golf, which is in Las Condes), San Ramón and La Granja unless you know exactly where you're going. Though these places are not completely unsafe for the most part, they can have a few unsafe spots and don't have much touristic significance.
The safest comunas are Providencia, Vitacura, Ñuñoa, La Reina and Las Condes. All of them have lots of local security guards, besides Carabineros, and locals are more likely to speak English, especially young people. They are not completely safe, though: petty theft still takes place, so keep your eyes open. Lo Barnechea can be tricky as it is the only comuna that has both extremely wealthy and extremely poor neighborhoods; "La Dehesa" is wealthy and safe, "Cerro Dieciocho" is as dangerous as Cerro Veinte and La Legua.
The subway (Metro) is regarded as safer for travelling amongst the locals, even though security has increased in the buses after the introduction of Transantiago. Although some locals still prefer using the subway especially when it gets darker, since almost all the stations have guards. Don't expect the staff to speak much English. Pickpockets are very active on the metro cars, especially during peak travel hours. Always take off your backpack and wear it on the front when you are walking in Santiago Centro.
You can trust in the Carabineros (Chilean Police). Although you can hardly find one who can speak English, they will try to answer your questions, solve your problems or give you orientations. DO NOT ATTEMPT TO BRIBE Chilean Police.
Download the SOSAFE app, as it is connected to the local security guards. In case of a police emergency dial 133 or 911 (both of them work), if you don't speak Spanish they will communicate you to a special communication center that speaks Spanish, English, French, and Creole. For Ambulance dial 131 or the nearest hospital, for Firefighter (Bomberos) dial 132. Remember the ABC Rule:
- 131 A for Ambulancia (Ambulance)
- 132 B for Bomberos (Firefighter)
- 133 C for Carabineros (Police)