Star Alliance member Air Canada is currently selling cheap tickets from Madrid to Boston and New York-La Guardia. Even if you add luggage, the price still remains a good one. Availability is especially high in October and November, but there are also some available dates in 2021.
You will usually first fly to a European Star Alliance hub, such as Brussels or Frankfurt, with a European Star Alliance airline, such as Brussels Airlines or Lufthansa, and then continue the rest of the trip on Air Canada flights. In some occasions, you will even fly directly from Madrid to Canada, before continuing your journey to the United States. The long-haul flights should be operated on a Boeing 787-Dreamliner.
Feel free to check out our other economy class dealz from Madrid:
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This deal will remain valid until May 31, 2020. You can fly from October 14th until December 11th (or 16th on the inbound flight), as long as you respect the minimum stay requirement of 7 days. There are also quite a few available dates in March 2021.
You can find all available dates on Google Flights and then book the cheapest fare on our Travel-Dealz flight search. We recommend booking the flights for as late as possible, as to reduce the risk of a cancellation due to the Coronavirus.
If the Coronavirus really should continue to be a problem, Air Canada does offer flexibility to its passengers:
The tickets are issued in booking class K, which for a roundtrip as described above should roughly give you: