United Airlines offers roundtrip flights to New York City from select cities in the U.S. with prices starting at $138, as provided by ShermansTravel. (Click on "United.com" in the main paragraph to see this sale; all taxes are included.) That's tied with our mention from three weeks ago and it's the lowest current rate we could find for select routes by $20. This price is valid on flights departing from Boston, MA, (BOS) to Newark, NJ, (EWR) on May 18; prices vary depending on the departure cities and dates chosen. Blackout dates may apply. Book this travel deal by April 25 for travel May 1 through June 30. Other notable deals: