Route brief · BOS → LIS
Boston → Lisbon
$377
round-trip · too little price history on this route to compare
Apr 3 '27 – Apr 10 '27 · 7 nights
TAP Air PortugalNonstop
Cached fare — the booking search re-prices live before you pay.
Destination briefLISLisbonTiled hills, custard tarts, Atlantic light — TAP’s hub wars keep this Europe’s cheapest gateway.Best windowMar–Jun · Sep–OctAirportsHumberto Delgado (LIS)All routes into LisbonWhen this route gets cheap.
Best time to be in Lisbon: Mar–Jun · Sep–Oct. Fare history for this route is still thin, so we make no seasonal call yet.
The cheapest itinerary we are tracking flies TAP Air Portugal nonstop and takes about 6.5 hours outbound, on a 7-night trip. At $377 for 5,131 km each way, that works out to about $37 per 1,000 km flown. That is below the $39 typical of medium-haul fares here. Across the 6 departure cities we track at a similar distance from Lisbon, this fare ranks 2nd — 16% above the $326 from Dubai. It is also the 2nd cheapest of the 24 routes of similar length we watch out of Boston. We have 3 months of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage.
The 7 days we hold a cached fare for
Tap a date → live search
The median cached fare across this calendar is 2% lower than when tracking began on Aug 8 — $746 then versus $732 now, across 5 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $643, on Nov 19.
- Sun, Sep 13$732
- Mon, Sep 14$763
- Wed, Sep 16$745
- Thu, Sep 17$725
- Sat, Oct 3$740
- Wed, Oct 21$658
- Sat, Nov 21$718
These are the only days we have a cached price for on this route so far — not the only days it flies. The search above covers any date.
Route facts
- Airports
- Logan (BOS) ↔ Humberto Delgado (LIS)
- Flight time
- ~6.5 hours outbound
- Distance
- ~5,131 km each way
- Airlines on the board
- TAP Air Portugal
- Itineraries
- Nonstop available
- Best months to visit
- Mar–Jun · Sep–Oct
BOS → LIS, answered.
How far in advance should I book BOS → Lisbon?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. See /guides/what-moves-a-flight-price/ for the levers we can measure.
Are there nonstop flights from Boston to Lisbon?
Yes — the current board includes nonstop fares (TAP Air Portugal). The outbound leg runs around 6.5 hours.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on September 1). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Lisbon?
Lock the flight first — then compare stays for Apr 3 '27 – Apr 10 '27 · 7 nights.
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Missed it?
Cached fares expire. This route has a feed of its own — follow it and the next BOS → LIS drop reaches you as soon as we find it.
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