With prices from San Francisco (SFO) to Miami (MIA) roundtrip usually priced at closer to $600, the $237 roundtrip United has SFO to MIA at is a sweet deal. Deets: Travel via United Airlines Valid for travel until July 2013; limited dates for the $237 price (mostly for weekday travel to get that rate) For economy seats Sample dates used to check: 10/16-10/22   How to search for prices or book: Go to United.com Enter SFO to MIA and select “my dates are flexible” and choose the month you are…… (click read more!)