DL639Delta Air Lines · LAX → BOS
live · 5m ago
Route confirmed Delta Air Lines

DL639 Los AngelesLAX · 06:40 BostonBOS · 15:10

DL639 by Delta Air Lines flies from Los Angeles (LAX) to Boston (BOS) for the Thu, Oct 29 departure.

Right nowExpected in Boston · On Time
15:01

arrival expected at BOS · 9 min early

Typical gate push+16 minmedian posted departure
Typical arrival−9 minmedian over 5 operations
Wins back in air~25 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 5 operations · gate push → arrival
0+30+60+90 min
10-29
+16 gate · −9 arrival
10-28
+16 gate · −9 arrival
10-27
+11 gate · −13 arrival
10-26
+34 gate · +4 arrival
10-25
+14 gate · −5 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The last 30 days

arrival outcome per operation

median arrival −9 min · 0 cancelled · 5 operations tracked

The route today

live boards
LAXLos AngelesOn-time likelyLAX delay board →
BOSBostonOn-time likelyBOS delay board →
LAX→BOSevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
42%Chance of 15+ min delay
3.0%Chance of cancellation
+7 minTypical airport delay in this weather

Conditions at LAX and BOS 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 on this route

Forecast

Los Angeles to Boston with Delta Air Lines · Fri 30 Oct, local date

Outlook: about usual
Chance a departure is cancelled
0.3%0.7× usual
Chance a departure leaves 60+ min late
15%1.1× usual

Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · About 4 departures a day on this route with this airline. · 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 Los Angeles to Boston flights today

same route · Delta Air Lines
DL437departs 10:50
DL2166departs 15:25
DL507departs 20:59

If DL639 is cancelled, these are the other Delta Air Lines nonstop flights from Los Angeles to Boston on the same day, with scheduled departure times in LAX 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 DL639 actually runs

Pro Flight Search has tracked every published board update for DL639 across the LAX and BOS boards: schedule changes, gate pushes and actual clocks. Usually lands ~5 min early. Based on 3 confirmed landings · 3/3 within 15 min of schedule.

The verdict above is that record speaking, so it reflects how DL639 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
10-29LAX 06:40 06:56 (+16)BOS 15:10 15:01 (−9)
10-28LAX 06:40 06:56 (+16)BOS 15:10 15:01 (−9)
10-27LAX 06:40 06:51 (+11)BOS 15:10 14:57 (−13)
10-26LAX 06:40 07:14 (+34)BOS 15:10 15:14 (+4)
10-25LAX 06:40 06:54 (+14)BOS 15:10 15:05 (−5)

Aircraft

Recent tails: N710TW, N717TW, N711ZX.

Board clocks recorded as LAX and BOS published them.

Planning around DL639? 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: DL639 Los Angeles to Boston on-time performance, measured from the LAX and BOS airport boards.

Canonical URL
https://proflightsearch.com/flight/DL639
How we measure this →