JL4121Japan Airlines · NRT → HND
live · 7m ago
Route confirmed Japan Airlines

JL4121 TokyoNRT TokyoHND

JL4121 by Japan Airlines flies from Tokyo (NRT) to Tokyo (HND).

Right nowNext departure Thursday Operates Thu
22:09

scheduled from NRT

The route today

live boards
NRTTokyoOn-time likelyNRT delay board →
HNDTokyoOn-time likelyHND delay board →
NRT→HNDevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
36%Chance of 15+ min delay
3.2%Chance of cancellation
+8 minTypical airport delay in this weather

Conditions at NRT and HND are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at Tokyo

Forecast

Sun 1 Nov, local date

High20°Clikely 18°C to 22°C
Low10°Clikely 9°C to 13°C
Outlook: about usual
Chance a departure is cancelled
1.4%usually 1.8%
Chance a departure leaves 60+ min late
3.1%usually 3.6%

Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · Based on about 320 departures a day. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Tokyo

Forecast

Sun 1 Nov, local date

High20°Clikely 19°C to 22°C
Low14°Clikely 13°C to 16°C
Outlook: below usual
Chance a departure is cancelled
1.1%usually 1.5%
Chance a departure leaves 60+ min late
2.0%usually 2.4%

Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · Based on about 670 departures a day. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Tokyo to Tokyo flights

same route · Japan Airlines
JL8121departs 07:07 · Thu
JL8123departs 07:19 · Thu

If JL4121 is cancelled, these are the other Japan Airlines nonstop flights from Tokyo to Tokyo, with scheduled departure times in NRT local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How JL4121 actually runs

Pro Flight Search has tracked every published board update for JL4121 across the NRT and HND boards: schedule changes, gate pushes and actual clocks. Combined risk score: 1.5/100. Based on airport operations, weather, and cached board history at NRT and HND.

The verdict above is that record speaking, so it reflects how JL4121 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Planning around JL4121? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: JL4121 Tokyo to Tokyo on-time performance, measured from the NRT and HND airport boards.

Canonical URL
https://proflightsearch.com/flight/JL4121
How we measure this →