The Geneva Cointrin International Airport is located near Geneva, around 1h30 away from Fribourg by car with a direct access to the highway. The Swiss national railways have a station at Geneva airport and you can reach Fribourg in 1h30, with one train available every half-hour.
Geneva International Airport is a major hub for Swiss, the national company of Switzerland, and also or EasyJet. It is also served by major companies like Air France, Aeroflot Alitalia, British Airways, Iberia, KLM, Lufthansa, TAP, etc. It is therefore connected to every major city in Europe. Direct intercontinental flights are also available with cities like New York, Washington, Montreal, Dubaï, Doha, etc. Despite the number of flights, the airport has kept a human size. All important car rental companies have offices at the airport.
Airport web site: http://www.gva.ch/