The Zurich Airport, also known as Zurich Kloten Airport, or Zurich Flughafen in German, is the largest international airport of Switzerland. It takes about 2 hours to reach Fribourg by car on the highway from the airport. The Swiss national railways have a station at Zurich Airport and you can reach Fribourg in 1h40 with trains departing every half-hour.
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.