Morning rush
49 min 446 trips · 83% on paceOBSERVED MBTA TRAVEL TIME · 30 SERVICE DAYS
Chestnut HilltoUnion Square
Green Line
A direct train took 50 minutes on a typical trip. On a slower-than-usual trip, allow up to 57 minutes.
Typical50 min50th percentile
Slower trip57 min90th percentile
Scheduled52 minmedian timetable
On pace75%within 2 min of schedule
THE SHORT ANSWER
How long does Chestnut Hill to Union Square take?
Based on 2,391 direct trips between 2026-08-17 and 2026-09-15, the median observed ride was 50 minutes. That was within 2 minutes of the published schedule.
Nine out of ten measured trips finished within approximately 57 minutes. These figures describe completed direct trips; they do not include the time spent waiting for the train.
WHEN YOU TRAVEL
Time-of-day breakdown
Off-peak produced the fastest typical result in this window; Evening rush was slowest. Differences can change as the rolling dataset updates.
Midday
51 min 588 trips · 77% on paceEvening rush
53 min 497 trips · 64% on paceOff-peak
48 min 860 trips · 75% on paceHOW TO READ THIS
Measured, not promised.
TransitMeter pairs vehicle stop timestamps with the schedule active for each trip. We publish the median because one dramatic delay should not define an everyday journey, and the 90th percentile because riders still need to understand the bad end of normal.
We do not infer why a trip ran slowly. Construction, incidents, crowding and weather require separate evidence.
Read the complete method →MORE FROM Chestnut Hill