Round trip Boston to Madrid from $366

Expedia is offering round trip flights from Boston (BOS) to Madrid (MAD) for $366, down from typical higher fares. These non-stop basic economy fares allow a personal item and a carry-on bag and are available for travel from October 2026 through April 2027, with a slight increase to $371 in peak months. The deal includes specific travel dates across the period, and booking must be made through Expedia. This fare offers a good value given the nonstop convenience and the time span it covers, making it a solid deal for travelers planning ahead. The restrictions on seat selection and changes are typical for basic economy fares but are clearly communicated, and the price is competitive for non-stop flights to Madrid at that time of year.