Morning rush
49 min 453 trips · 83% on paceOBSERVED MBTA TRAVEL TIME · 30 SERVICE DAYS
Chestnut HilltoUnion Square
Green Line
A direct MBTA train from Chestnut Hill to Union Square took a median 50 minutes across 2,448 observed trips; 90% of measured rides finished within approximately 57 minutes.
Source: MBTA Performance Data · 2026-08-20 to 2026-09-18 · Completed direct trips only
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?
The median completed ride from Chestnut Hill to Union Square was 50 minutes; the published schedule’s median was 52 minutes.
Based on 2,448 direct trips between 2026-08-20 and 2026-09-18, 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
Chestnut Hill to Union Square times by daypart
Off-peak produced the fastest median for Chestnut Hill to Union Square; Evening rush produced the slowest.
Differences can change as the rolling dataset updates.
Midday
51 min 599 trips · 76% on paceEvening rush
53 min 512 trips · 65% on paceOff-peak
48 min 884 trips · 76% on paceMEASUREMENT SAMPLE
How Chestnut Hill to Union Square was measured
The Chestnut Hill to Union Square estimate uses 2,448 completed direct-trip stop-timestamp pairs matched to the schedule active for each observed train.
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
Trips related to Chestnut Hill to Union Square
The Chestnut Hill to Union Square record is accompanied by 6 other measured direct rides beginning at Chestnut Hill, each with a published median duration.