How we know: Sources are listed at the end. Airline and route facts come from the cited references; booking windows from Google Flights' published data. This post quotes no fares: Wildly's own price observations began in late September 2026 and are shown live on the route pages, not summarised in prose.
The cheapest flight to Europe on any given day is a moving target, but where it appears is not. It is almost always on a route with a low-cost carrier or several full-service airlines competing, from a handful of US gateways, in the months when American demand is low. Aim at those and let an alert find the day.
The gateways where cheap fares live
- New York (JFK and Newark). The most competition of any US city: Norse Atlantic's 787s from JFK to London Gatwick, Paris, Rome, Athens, Berlin and Oslo (Norse Atlantic Airways); French Bee and La Compagnie from Newark to Paris Orly; Level to Barcelona; TAP to Lisbon; and every major carrier. See JFK to Paris, JFK to London and Newark to Paris.
- Boston. Icelandair, Aer Lingus and TAP price their home-gateway routes aggressively, and Delta and JetBlue compete on London, Paris, Dublin and Lisbon. See Boston to Lisbon and Boston to Reykjavík.
- Miami. Madrid has three carriers (American, Iberia, Air Europa) and Level and French Bee add low-cost options. See Miami to Madrid.
- San Francisco and Los Angeles. French Bee to Paris Orly and Level to Barcelona give the West Coast its low-cost transatlantic options (French Bee; Level).
- Chicago and Washington. Fewer low-cost carriers but strong Star Alliance and oneworld competition, plus Icelandair.
If you live elsewhere, the question is whether a cheap positioning flight to one of these gateways plus the gateway fare beats your home airport's fare; see positioning flights.
The airlines that set the floor
- Norse Atlantic (New York to London Gatwick, Paris, Rome, Athens, Berlin, Oslo): seat-only fares, bags and meals extra.
- French Bee (Paris Orly from Newark, San Francisco, Miami, seasonally Los Angeles): A350s, tiered economy fares.
- Level (Barcelona from New York, Boston, Miami, Los Angeles, San Francisco): IAG's low-cost brand.
- Icelandair (Boston, New York, Washington, Chicago, Seattle, Denver, Minneapolis, Orlando via Reykjavík): full service with a free stopover of up to seven days (Icelandair).
- TAP Air Portugal (Lisbon from Newark, JFK, Boston, Miami and more): discount fare tiers and a free Portugal Stopover of up to 10 days (TAP Portugal Stopover).
- Condor (Frankfurt) and the majors' basic economy fares, which exist because of the carriers above.
PLAY, which flew Boston and Baltimore to Iceland, ceased operations in September 2025; check that any low-cost carrier still flies your route. Full comparison in budget airlines to Europe.
The months demand drops
US demand for Europe peaks mid-June to August and over Christmas and New Year. It is lowest in November (outside Thanksgiving week), January, February and early March, and moderate in the shoulder months of April–May and September–October, when the weather is good and prices have not yet caught up. If you can choose the month, choose one of those; see the Europe shoulder season guide.
When to book
Google Flights' published data puts US–Europe fares lowest around 94 days before departure, with the low range beginning 50 or more days out, and midweek departures about 13% cheaper than weekends (Thrifty Traveler on Google Flights data). Start watching four to six months out; book when you see a fare you like inside the three-month window.
A method that finds today's cheapest fare
- Widen the search. All New York airports, all London or Paris airports, plus/minus three days.
- Consider the cheapest gateway into Europe, not the final city. Lisbon, Madrid, Dublin and Reykjavík are often the cheapest entry points; a low-cost intra-Europe flight or a train finishes the trip.
- Add the bag. Price the low-cost carrier's bundle you actually need against the majors' basic economy.
- Fly Tuesday or Wednesday if you can.
- Set alerts on two or three route options with a target below today's fare and let them run. Set a price alert.
- Book the day it fires. Cheap fare buckets on competitive routes go quickly.
FAQ
Which US city has the cheapest flights to Europe? Usually New York, then Boston and Miami, because that is where the low-cost carriers and the most competition are.
What is the cheapest month to fly to Europe? Typically November, January or February; the shoulder months are the best balance of price and weather.
Which European city is cheapest to fly into? It varies by day, but Lisbon, Madrid, Dublin, Reykjavík, London and Paris are consistently competitive because several carriers, including low-cost ones, serve them.