Boston to Paris tickets are priced $368 to $370s with British Airways and low $400s to Munich, Frankfurt and Amsterdam for travel April to June 2017. Major alliances are competing with low Icelandair fares for multiple airline choices on Europe routes for spring season travel at low fares.
Paris has Oneworld airlines competing with fares at $370 round trip to Icelandair $368. Lowest ticket prices May 11 – June 12.
British Airways ticket for AA operated nonstop flights
Boston – Paris CDG – Boston BOS
Frankfurt lowest fares are around $420 from mid-March to mid-June with Oneworld airline Iberia.
Iberia Airlines Boston BOS – Madrid MAD – Frankfurt FRA – Madrid MAD – Boston BOS
Munich has ticket prices around $400 with both Oneworld and SkyTeam in May and June.
Iberia Airlines Boston BOS – Madrid MAD – Munich MUC – Madrid MAD – Boston BOS
Amsterdam is a Star Alliance low fare of $426 undercutting SkyTeam and Oneworld by $100.
United Airlines ticket for Air Canada operated codeshare flights
Boston BOS – Toronto YYZ – Amsterdam AMS – Toronto – Boston