I am getting ready to purchase tickets for a trip for my family of 4 from San Francisco to Madrid in July 2014. I have 3 choices for flights on my preferred airline -- United. One trip has a connection in Toronto with a 62 minute layover. The second option has a 1 hour and 50 minute layover at Dulles and the third has a 49 minute layover in Newark. I don't like the Newark option because I have experienced delays almost every time that I have flown into or out of that airport. I am leaning toward the Toronto layover because it is the shortest and cheapest trip but I am worried that we will not have enough time to make the connection. I have no experience with the Pearson airport and I am wondering what the experts think of the viability of my family making that connections offered by the airline through Pearson, Newark or Dulles. Thanks for your thoughts on this.