The journey between Connecticut and New York is one of America's most traveled corridors, but "how long" depends entirely on where you're starting, where you're going, and how you're getting there.
Southwestern CT to NYC: Greenwich to Manhattan: 45-60 minutes (30 miles). Stamford to Midtown: 1-1.5 hours. Bridgeport to Manhattan: 1.5-2 hours (55 miles).
Central CT to NYC: New Haven to Manhattan: 1.5-2 hours (80 miles). Hartford to Manhattan: 2-2.5 hours (115 miles).
Eastern CT to NYC: New London to Manhattan: 2.5-3 hours (130 miles).
Traffic dramatically affects these times. Rush hour can add 60-90 minutes. The I-95 corridor is notorious for congestion; the Merritt Parkway (CT-15) offers a scenic but trucks-prohibited alternative.
Metro-North Railroad (New Haven Line): Grand Central to Stamford: 50 min. To New Haven: 1 hr 45 min. To New London (Shore Line East connection): 2.5+ hours.
Amtrak Northeast Regional/Acela: New Haven to Penn Station: 1 hr 45 min (Regional) / 1 hr 30 min (Acela).
Greyhound, Peter Pan, and Megabus connect major CT cities to NYC Port Authority in 2-3.5 hours depending on route and stops.
For precise planning, use real-time navigation apps and check MTA/Metro-North schedules before departing.