ON TIMEBOARD
Delta Air Lines / BOS → ORD

DL 2570 on time

Delta Air Lines 2570: Boston to Chicago at 7:30 a.m.; Chicago to Boston at 10:15 a.m. (past 12 months). Figures below the title are for BOS → ORD, its busiest leg

On time
78%
266 flights · likely 72–82%
Cancelled
3.0%
of scheduled flights
Typical arrival
−7 min
median vs schedule
When late
+58 min
average delay
Similar flights
75%
DL, same route & hour

About 1 in 5 DL 2570 flights from Boston arrived 15+ minutes late, diverted or cancelled over the past year (22%); 3.0% were cancelled. The typical flight landed 7 minutes early.

DL 2570: BOS → ORD

Scheduled to leave Boston at 7:30 a.m. local time. Over the past year it arrived on time 78% of the time (266 flights), in line with other DL flights on the route at that hour (75%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jul 2025: 81% on time (27 flights)81JulAug 2025: 86% on time (28 flights)86AugSep 2025: 80% on time (30 flights)80SepOct 2025: 68% on time (31 flights)68OctNov 2025: 63% on time (30 flights)63NovDec 2025: 68% on time (19 flights)68DecMar 2026: 67% on time (21 flights)67MarApr 2026: 82% on time (22 flights)82AprMay 2026: 84% on time (25 flights)84MayJun 2026: 89% on time (27 flights)89JunJul 2026: 97% on time (30 flights)97JulAug 2026: 77% on time (31 flights)77Aug

By day of week

DayFlightsOn time
Monday4279%
Tuesday4178%
Wednesday4188%
Thursday4088%
Friday3982%
Saturday2450%
Sunday3969%

Why it was late

Air traffic & airport (NAS) 50%Airline (crew, maintenance, ops) 45%Late inbound plane 4%

All flights BOS → ORD · Connecting off DL 2570? Check the risk

DL 2570: ORD → BOS

Scheduled to leave Chicago at 10:15 a.m. local time. Over the past year it arrived on time 71% of the time (242 flights), in line with other DL flights on the route at that hour (72%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Jul 2025: 58% on time (26 flights)58JulAug 2025: 86% on time (28 flights)86AugSep 2025: 70% on time (30 flights)70SepOct 2025: 58% on time (31 flights)58OctNov 2025: 70% on time (30 flights)70NovDec 2025: 68% on time (19 flights)68DecMar 2026: 67% on time (21 flights)67MarApr 2026: 83% on time (24 flights)83AprMay 2026: too few flights (4 flights)MayJun 2026: 73% on time (22 flights)73JunJul 2026: 80% on time (30 flights)80JulAug 2026: 71% on time (31 flights)71Aug

By day of week

DayFlightsOn time
Monday3866%
Tuesday3768%
Wednesday3776%
Thursday3566%
Friday3482%
Saturday2665%
Sunday3577%

Why it was late

Late inbound plane 45%Air traffic & airport (NAS) 39%Airline (crew, maintenance, ops) 15%Severe weather 1%

All flights ORD → BOS · Connecting off DL 2570? Check the risk

Questions

How often is DL 2570 from BOS to ORD late?

Delta Air Lines 2570 from Boston, MA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 22% of 266 scheduled flights between September 2025 and August 2026. 3.0% were cancelled.

How often is DL 2570 from ORD to BOS late?

Delta Air Lines 2570 from Chicago, IL to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 29% of 242 scheduled flights between September 2025 and August 2026. 2.1% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.