Megabus, the low-fare bus company, is giving away 200,000 free seats for travel in the United States and to Toronto, based on availability. Travel Jan. 4 through March 1. Book at www.megabus.com, ...

Passengers can book on the Megabus website using the promotional code "go free." Megabus launched in 2006 and is known for offering fares as low as $1 each way.