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Route on-time record

BWI to BOS: most on-time flights and the best time to fly

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Boston (Boston Logan International Airport). 3,613 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 2.8% were cancelled. The most reliable flight number was Southwest 942 at 8:20 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

BWI → BOS

Baltimore to Boston: 3,613 nonstop flights a year

On time (12 months)

74%

Cancelled

2.8%

avg delay 19 min

Best time to leave

Before 9 AM

93% on time vs 56% after 9 PM

Most reliable airline

Republic

78% chance on time

Check BWI to BOS fares

Lowest nonstop fare seen in the next two months: $52 (Southwest 4725 on 2026-11-24). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Southwest 942

    8:20 AM → 10:00 AM1h 40m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1435; its record covers all of them.

    93%

    chance on time

    On time (history)
    100%
    Cancelled
    1.6%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (60 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; After 9 PM: 56%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Moderate track record · 60 flights

    Find Southwest 942 fares Opens this date on Aviasales

  2. #2 · Southwest 1058

    6:35 AM → 8:05 AM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2229; its record covers all of them.

    89%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 92% of the time (87 flights, Jun 2025 to May 2026).
    • Never cancelled in 87 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; After 9 PM: 56%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Moderate track record · 87 flights

    Find Southwest 1058 fares Opens this date on Aviasales

  3. #3 · Republic 5703 · sold as American Eagle, Delta Connection or United Express

    10:54 AM → 12:26 PM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    86%

    chance on time

    On time (history)
    90%
    Cancelled
    3.0%
    Avg arrival delay
    10 min
    • Arrived on time 90% of the time (160 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (5 of 165).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 160 flights

    Find 10:54 AM flight fares Opens this date on Aviasales

  4. #4 · Southwest 1062

    10:40 AM → 12:10 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 138; its record covers all of them.

    86%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 90% of the time (87 flights, Jun 2025 to May 2026).
    • Never cancelled in 88 scheduled flights.
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 87 flights

    Find Southwest 1062 fares Opens this date on Aviasales

  5. #5 · Spirit 900

    6:35 AM → 7:58 AM1h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-01.

    84%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; After 9 PM: 56%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find Spirit 900 fares Opens this date on Aviasales

  6. #6 · Republic 5668 · sold as American Eagle, Delta Connection or United Express

    3:35 PM → 5:09 PM1h 42m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    77%

    chance on time

    On time (history)
    82%
    Cancelled
    4.2%
    Avg arrival delay
    11 min
    • Arrived on time 82% of the time (138 flights, Jun 2025 to May 2026).
    • Cancelled 4.2% of the time (6 of 144).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 138 flights

    Find 3:35 PM flight fares Opens this date on Aviasales

  7. #7 · Southwest 548

    12:05 PM → 1:35 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    76%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 548 fares Opens this date on Aviasales

  8. #8 · Southwest 2555

    8:15 PM → 9:50 PM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    67%

    chance on time

    On time (history)
    73%
    Cancelled
    4.3%
    Avg arrival delay
    13 min
    • Arrived on time 73% of the time (22 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (22 flights), so its score leans on the airline's record at this hour.

    Limited track record · 22 flights

    Find Southwest 2555 fares Opens this date on Aviasales

  9. #9 · Southwest 4346

    3:45 PM → 5:15 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    66%

    chance on time

    On time (history)
    65%
    Cancelled
    0.0%
    Avg arrival delay
    29 min
    • Arrived on time 65% of the time (23 flights, Jun 2025 to May 2026).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 4346 fares Opens this date on Aviasales

  10. #10 · Southwest 888

    1:40 PM → 3:10 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    66%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 888 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)78%

    1,083 flights · 80% on time as flown · 3.1% cancel

  • Southwest Airlines70%

    2,381 flights · 72% on time as flown · 2.6% cancel

  • Spirit Airlines67%

    149 flights · 65% on time as flown · 3.8% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM93%

    832 flights · avg delay 4 min

  • 9 AM to noon88%

    703 flights · avg delay 8 min

  • Noon to 3 PM67%

    569 flights · avg delay 22 min

  • 3 to 6 PM59%

    623 flights · avg delay 33 min

  • 6 to 9 PM63%

    557 flights · avg delay 29 min

  • After 9 PM56%

    329 flights · avg delay 30 min

Best day: Wednesday (79%). Worst: Sunday (71%).

Smarter routing

Nearby airports that run more on time

  • BWI → MHT 81% chance on time

    Baltimore/Washington International Thurgood Marshall Airport to Manchester-Boston Regional Airport · 1,710 flights a year · 45 mi from your airports · yours: 72%

    Rank flightsFares

  • BWI → PVD 77% chance on time

    Baltimore/Washington International Thurgood Marshall Airport to Rhode Island T. F. Green International Airport · 1,882 flights a year · 49 mi from your airports · yours: 72%

    Rank flightsFares

  • IAD → BOS 74% chance on time

    Washington Dulles International Airport to Boston Logan International Airport · 1,487 flights a year · 45 mi from your airports · yours: 72%

    Rank flightsFares

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
81
F
84
M
79
A
77
M
67
J
68
J
64
A
72
S
67
O
78
N
85
D
79

What delays this route

  • Air traffic control and airport volume38%
  • Late-arriving aircraft30%
  • Airline (crew, maintenance, boarding)29%
  • Severe weather3%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

BWI to BOS questions

What time of day is best to fly BWI to BOS?
Before 9 AM: 93% of flights arrived on time, against 56% for departures after 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from BWI to BOS?
Republic, with a season-adjusted 78% chance of operating and arriving on time over 1,083 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on BWI to BOS?
July (64% on time); the best was November (85%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from BWI

Live status: FAA delays and ground stops