Morning rush
48 min 545 trips · 78% on paceOBSERVED MBTA TRAVEL TIME · 30 SERVICE DAYS
Union SquaretoChestnut Hill
Green Line
A direct MBTA train from Union Square to Chestnut Hill took a median 49 minutes across 3,108 observed trips; 90% of measured rides finished within approximately 56 minutes.
Source: MBTA Performance Data · 2026-08-20 to 2026-09-18 · Completed direct trips only
Typical49 min50th percentile
Slower trip56 min90th percentile
Scheduled50 minmedian timetable
On pace71%within 2 min of schedule
THE SHORT ANSWER
How long does Union Square to Chestnut Hill take?
The median completed ride from Union Square to Chestnut Hill was 49 minutes; the published schedule’s median was 50 minutes.
Based on 3,108 direct trips between 2026-08-20 and 2026-09-18, the median observed ride was 49 minutes. That was within 1.5 minutes of the published schedule.
Nine out of ten measured trips finished within approximately 56 minutes. These figures describe completed direct trips; they do not include the time spent waiting for the train.
WHEN YOU TRAVEL
Union Square to Chestnut Hill times by daypart
Off-peak produced the fastest median for Union Square to Chestnut Hill; Evening rush produced the slowest.
Differences can change as the rolling dataset updates.
Midday
49 min 829 trips · 67% on paceEvening rush
51 min 665 trips · 68% on paceOff-peak
47 min 1,069 trips · 71% on paceMEASUREMENT SAMPLE
How Union Square to Chestnut Hill was measured
The Union Square to Chestnut Hill estimate uses 3,108 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 Union Square
Trips related to Union Square to Chestnut Hill
The Union Square to Chestnut Hill record is accompanied by 6 other measured direct rides beginning at Union Square, each with a published median duration.