Not all Logan flights are created equal. Your choice of departure time has a bigger effect on your travel day than the airline you choose.

The golden window: 6:00-7:30 AM

Counterintuitively, the earliest flights are usually the most reliable. Here's why: the aircraft slept at Logan overnight, so there's no inbound delay risk. Morning fog and snow are typically the only weather concerns. TSA is staffed and flowing. On-time performance for 6:00-7:30 AM departures runs 85-90% at Logan — roughly 15 points better than afternoon flights.

The catch: these flights require an extremely early alarm. A 6 AM departure means you're leaving home at 4:15 AM.

The avoid window: 4:00-7:00 PM

Late afternoon is the worst time to fly from Logan. Here's why: your aircraft has already flown 2-4 legs earlier in the day, each of which can introduce delay that cascades to you. New England weather (summer thunderstorms, winter squalls) typically hits mid-afternoon. ATC delays at JFK, LaGuardia, and Newark during evening rush ripple up to Boston. On-time performance for 4-7 PM departures drops to 65-70% seasonally.

The day-of-week factor

  • Best days to fly: Tuesday, Wednesday, Saturday
  • Worst days to fly: Monday morning, Friday afternoon, Sunday evening

Monday 5-8 AM is the worst window of the week for Logan — business travelers clog both security and the gates, and a single delayed flight cascades through the whole morning.

Seasonal reality

Logan's worst on-time performance is December-February (winter weather) and June-August (thunderstorms). Spring and fall are the smoothest travel seasons, with March and October typically showing the best on-time rates.

Holiday no-fly days

If you have any choice, avoid the Wednesday before Thanksgiving, the Sunday after Thanksgiving, December 23-24, and January 2-3. These are Logan's highest-volume days every year, with TSA waits easily exceeding 90 minutes even with PreCheck.

The takeaway for booking

If your schedule is flexible, book a Tuesday or Wednesday flight departing between 6:00 AM and 10:00 AM. You'll pay less, wait less, and arrive on time more reliably. Book your Logan car service the night before, get a good night's sleep, and let someone else handle the 4:30 AM drive.