There is no nonstop path linking Newark and Estonia's capital, which is precisely why routing choice matters more on this journey than almost any other in the transatlantic network. Business class from Newark to Tallinn always involves a connection, and the two smartest options are Finnair through Helsinki or Lufthansa through Frankfurt or Munich, both of which get you into Tallinn in under two hours from the hub. Finnair's Helsinki connection is the one I favor after dozens of trips on this corridor: their A330 business class on the transatlantic leg offers lie-flat seats with direct aisle access, and Helsinki Airport's compact layout means even a 70-minute connection feels comfortable rather than frantic, followed by a short regional hop across the Gulf of Finland that puts you in Tallinn faster than any alternative.
Lufthansa is the other serious contender, especially now that their long-haul fleet is progressively rolling out Allegris seating on select 787 and A350 routes from Newark; if you're booking well ahead, it's worth checking whether your specific tail number has been upgraded, since the older business class product, while solid, doesn't match Allegris for privacy or storage. Frankfurt remains the more reliable hub of the two for connection times given its scale, though Munich often runs smoother during peak summer congestion. Delta, operating this corridor in partnership through its transatlantic joint venture, tends to route via Amsterdam or Paris depending on the day, and their Delta One suite is worth prioritizing if award availability lines up, since it's consistently one of the better hard products in the sky.
My insider tip: book the Helsinki connection deliberately during Tallinn's short but glorious summer, when Finnair often schedules extra evening rotations that shrink your layover to under an hour, and the Baltic light means you'll land with hours of daylight left for your first Old Town dinner. May through September is when fares soften and schedules densify, so set fare alerts now rather than waiting, since availability on these connecting business cabins tightens quickly once summer demand builds.
