We've scanned every flight from Boston to Dallas to find the best deals. If you want a cheap flight, it's best to be as flexible as you can on dates. If that day's no good for you, try searching by month to see some alternative dates.
Dallas/Fort Worth International Airport is just one of the airports in Dallas. If you're not set on a specific airport, try changing your search from Dallas/Fort Worth International Airport to Dallas to see a broader range of flights – they might be cheaper. It usually takes about 8 hrs 30 mins to fly 2511 km to Dallas/Fort Worth International Airport.
If you're planning on going to Dallas during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.