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Route on-time record

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

Boston (Boston Logan International Airport) to Salt Lake City (Salt Lake City International Airport). 1,255 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was Delta 859 at 6:15 AM.

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

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BOS → SLC

Boston to Salt Lake City: 1,255 nonstop flights a year

On time (12 months)

76%

Cancelled

1.5%

avg delay 17 min

Best time to leave

Before 9 AM

87% on time vs 66% 6 to 9 PM

Most reliable airline

Delta

77% chance on time

Check BOS to SLC fares

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 · Delta 859

    6:15 AM → 9:46 AM5h 24m nonstop

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

    87%

    chance on time

    On time (history)
    89%
    Cancelled
    1.6%
    Avg arrival delay
    6 min
    • Arrived on time 89% of the time (358 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 6 to 9 PM: 66%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 358 flights

    Find Delta 859 fares Opens this date on Aviasales

  2. #2 · Delta 464

    10:20 AM → 1:47 PM5h 20m nonstop

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

    78%

    chance on time

    On time (history)
    78%
    Cancelled
    0.8%
    Avg arrival delay
    22 min
    • Arrived on time 78% of the time (348 flights, Jun 2025 to May 2026).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 348 flights

    Find Delta 464 fares Opens this date on Aviasales

  3. #3 · Delta 445

    6:44 PM → 10:15 PM5h 21m nonstop

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

    68%

    chance on time

    On time (history)
    69%
    Cancelled
    1.2%
    Avg arrival delay
    21 min
    • Arrived on time 69% of the time (340 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 66% on time; Before 9 AM: 87%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 340 flights

    Find Delta 445 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines77%

    1,083 flights · 78% on time as flown · 1.2% cancel

On time by departure time

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

  • Before 9 AM87%

    391 flights · avg delay 7 min

  • 9 AM to noon78%

    339 flights · avg delay 20 min

  • 3 to 6 PM74%

    121 flights · avg delay 23 min

  • 6 to 9 PM66%

    387 flights · avg delay 23 min

Best day: Wednesday (84%). Worst: Sunday (74%).

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
79
F
76
M
77
A
81
M
80
J
74
J
71
A
79
S
87
O
85
N
85
D
77

What delays this route

  • Airline (crew, maintenance, boarding)43%
  • Air traffic control and airport volume30%
  • Late-arriving aircraft26%
  • Severe weather1%

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

Finding the most reliable connections from BOS to SLC…

BOS to SLC questions

What time of day is best to fly BOS to SLC?
Before 9 AM: 87% of flights arrived on time, against 66% for departures 6 to 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 BOS to SLC?
Delta, with a season-adjusted 77% 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 BOS to SLC?
July (71% on time); the best was September (87%), 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.

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Live status: FAA delays and ground stops