It won't save you time, but traveling by train is a great alternative to air traveler for many people. Free wifi, leg room, great views (especially on certain fall routes), and the ability to get up to walk around are serious perks that can make for a unique and wonderful vacation.
If that sounds like a good time, then Amtrak's flash sale might be what you're looking for. The company is currently running a four-day flash sale that shaves 40% off ticket prices. Book by July 12 for travel between August 1 and January 31, 2020 to find one-way tickets as low as $17. Destinations available in the sale include Boston, Chicago, Los Angeles, New Orleans, New York, Seattle, St. Louis, and Washington, DC, among other cities.