Lufthansa· Callsign DLH421

LH421 Flight Status: Boston to Frankfurt

Lufthansa between Boston and Frankfurt: 5,889 km north-east, long-haul, tracked live here whenever it is transmitting.

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Status on this page means observed ADS-B activity inside available receiver coverage. Confirm official delay, cancellation, gate and booking status with Lufthansa.

BOS
Boston
Boston Logan International Airport
5,889 km · 3,659 mi
Non-stop
FRA
Frankfurt
Frankfurt Airport
Aircraft
A340 313X
typical equipment
Distance
5,889 km
3,180 nautical miles
Heading
52°
tracks north-east
Clock change
+6 h
on arrival
Length rank
#149
of 271 tracked routes

Follow LH421 in real time

The aircraft appears below whenever it is airborne and inside receiver coverage. Its planned route is drawn between the two airports.

LH421 is not transmitting right now. It may be between rotations, on the ground, or out of receiver range - Check back near departure time. The full map has the rest of the sky, and what is flying over me will name whatever is above you instead.

LH421 at a glance

  • The trip: 5,889 km (3,659 miles) from Boston to Frankfurt, flying north-east.
  • How long: no published block time for this service yet.
  • Your watch: set it 6 hours forward on arrival.
  • Window seat tip: the right (south-facing) side gets the sun on a daytime flight.
  • The plane: usually an A340 313X.

LH421 route overview: BOS to FRA

LH421 distance and great-circle path

LH421 covers 5,889 km, or 3,659 miles. That makes it a long-haul flight, a widebody route with a full night's flying time. Of the 271 routes we track, it ranks 149 by distance.

Boston to Frankfurt is 5,889 km (3,659 miles) on an initial heading of 52°, which is broadly north-east. Watches move 6 hours forward between the two gates. It links United States with Germany.

Our guide explains how the BOS-FRA route appears on a tracker map.

What to know about LH421

  • Time change: you land 6 hours ahead of the time you left. That is enough to cause jet lag. Here is how pilots handle it.

What we know about LH421

What flying BOS to FRA takes

It is a long-haul sector, a widebody route with a full night's flying time. Lufthansa needs a widebody twinjet: the sector needs long-range tanks and a cabin crew rest provision, which rules out most single-aisle types. Eastbound, the jet stream is usually a tailwind, so the return leg against it tends to be the longer of the two. In daylight the sun sits on the right (south-facing) side of the cabin for most of the crossing.

How we verified this

The origin and destination on this page are the ones we verified for callsign DLH421 through adsbdb, not a schedule copied from elsewhere. We have logged it airborne on 5 days between 2026-09-20 and 2026-09-24. Timings are observations, not an official operational status: always confirm with the airline before travelling.

This page was published from our own tracking record rather than a third-party schedule feed, so it grows as we see the flight again. The seven-day log below is the raw version of the same evidence.

LH421 activity in the past 7 days

Our database contains 5 observations of LH421 across 5 UTC dates in this window, most recently 2026-09-24. Those records contain 3 distinct transponder addresses. The most frequently resolved route was BOS-FRA (5 records).

The median recorded visibility was 407 minutes. That is time inside receiver coverage, not airborne duration or an on-time-performance measurement.

Date (UTC)RouteFirst trackedLast trackedTracked for
2026-09-24 BOS → FRA 02:24 UTC 09:25 UTC 7h 1m
2026-09-23 BOS → FRA 02:19 UTC 09:00 UTC 6h 40m
2026-09-22 BOS → FRA 01:47 UTC 08:37 UTC 6h 50m
2026-09-21 BOS → FRA 02:43 UTC 09:29 UTC 6h 46m
2026-09-20 BOS → FRA 02:21 UTC 09:08 UTC 6h 47m

“First/last tracked” are when LH421 entered and left receiver coverage, in UTC.

Airports and aircraft on LH421

Every scheduled service we follow is listed in the tracker directory, including Lufthansa and other tracked flights grouped by airline.

BOS Boston Logan International Airport Boston, United States · live radar → FRA Frankfurt Airport Frankfurt, Germany · live radar →

Other tracked flights from Boston

FlightRouteTypical aircraft
B61621London (LHR) → Boston (BOS) B61621 flight tracker →
B6033Boston (BOS) → Paris (CDG) Airbus A321LRB6033 flight tracker →
IB341Madrid (MAD) → Boston (BOS) Airbus A321XLRIB341 flight tracker →
TP217Lisbon (LIS) → Boston (BOS) Airbus A321LRTP217 flight tracker →

Guides relevant to LH421

Chosen from this route's distance, timing, aircraft, airline and airports.

The science of jet lag Arrival shifts the clock by 6 hours. Narrowbody vs widebody aircraft A long-haul sector makes aircraft size, cabin layout and range especially relevant. Airline alliances explained Lufthansa belongs to Star Alliance, which affects connections and codeshares.

Data sources and review

Reviewed 2026-07-29 by Flight-Tracker.net Editorial Team

The route and typical schedule are maintained reference data. Live ADS-B observations are evidence of receiver coverage, not proof of on-time performance. Always confirm the operating date and times with the airline.

Read our schedule and observation review process, or inspect the machine-readable reference dataset.

Put LH421 on your own site

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LH421 frequently asked questions

How long is the LH421 flight?

Boston to Frankfurt is 5,889 km (3,659 miles) in a straight line. Actual airborne time varies with winds, routing and holding.

What aircraft operates LH421?

Typically an A340 313X.

Does LH421 fly every day?

Frequency varies by season. Always confirm with the airline before travelling.

Can I track LH421 live?

Yes. Whenever LH421 is airborne and in receiver coverage the map above follows it live, with altitude, ground speed and heading. Between rotations, the seven-day log above shows where it has been.

More Lufthansa flights to watch

FlightRouteTypical aircraft
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LH456 Frankfurt (FRA) → Los Angeles (LAX) Boeing 747-8 LH456 flight tracker →
LH716 Frankfurt (FRA) → Tokyo (HND) Boeing 747-8 LH716 flight tracker →
LH510 Frankfurt (FRA) → Sao Paulo (GRU) Boeing 747-8 LH510 flight tracker →
LH453 Munich (MUC) → Los Angeles (LAX) Airbus A380-800 LH453 flight tracker →