Morning rush
22 min 561 trips · 87% on paceOBSERVED MBTA TRAVEL TIME · 30 SERVICE DAYS
Union SquaretoArlington
Green Line
A direct MBTA train from Union Square to Arlington took a median 22 minutes across 3,176 observed trips; 90% of measured rides finished within approximately 27 minutes.
Source: MBTA Performance Data · 2026-08-20 to 2026-09-18 · Completed direct trips only
Typical22 min50th percentile
Slower trip27 min90th percentile
Scheduled24 minmedian timetable
On pace81%within 2 min of schedule
THE SHORT ANSWER
How long does Union Square to Arlington take?
The median completed ride from Union Square to Arlington was 22 minutes; the published schedule’s median was 24 minutes.
Based on 3,176 direct trips between 2026-08-20 and 2026-09-18, the median observed ride was 22 minutes. That was within 2 minutes of the published schedule.
Nine out of ten measured trips finished within approximately 27 minutes. These figures describe completed direct trips; they do not include the time spent waiting for the train.
WHEN YOU TRAVEL
Union Square to Arlington times by daypart
Off-peak produced the fastest median for Union Square to Arlington; Evening rush produced the slowest.
Differences can change as the rolling dataset updates.
Midday
23 min 837 trips · 81% on paceEvening rush
23 min 679 trips · 77% on paceOff-peak
21 min 1,099 trips · 82% on paceMEASUREMENT SAMPLE
How Union Square to Arlington was measured
The Union Square to Arlington estimate uses 3,176 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 Arlington
The Union Square to Arlington record is accompanied by 6 other measured direct rides beginning at Union Square, each with a published median duration.