Recommended translations:

• Plato's Symposium: A Translation with Commentaries by Allan Bloom and Seth Benardete, trans. Seth Benardete (University of Chicago Press, 2001).
• "Symposium," trans. A. Nehamas and P. Woodruff in Plato: Complete Works, ed. J. M. Cooper (Hackett, 1997).

Excerpt:

Apollodorus
I believe I have got the story you inquire of pretty well by heart. The day before yesterday I chanced to be going up to town from my house in Phalerum, when one of my acquaintance caught sight of me from behind, some way off, and called in a bantering tone “Hullo, Phalerian! I say, Apollodorus, wait a moment.” So I stopped and waited. Then, “Apollodorus,” he said, “do you know, I have just been looking for you, as I want to hear all about the banquet that brought together Agathon and Socrates and Alcibiades and the rest of that party, and what were the speeches they delivered upon love.”

Online:
Amazon (Recommended Translation: Benardete)
Amazon (Recommended Translation: Nehamas and Woodruff)
Project Perseus (English, Free Access)
Project Perseus (Greek, Free Access)
Project Gutenberg (Free Access)