Book round-trip airfare with prices from $137 during this sale from Delta Airlines. We found the best prices on Wednesday flights from Detroit to Boston and from New York to Miami. Flights from Los Angeles to Boston start at $313. Some of these flights require advanced booking and specific travel dates. Enter your travel information on AirfareWatchdog, then click "See All Details" next to your preferred flights to find out how to book them. Taxes, fees, and restrictions may apply.