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Route on-time record

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

Salt Lake City (Salt Lake City International Airport) to Boston (Boston Logan International Airport). 1,255 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 1.8% were cancelled. The most reliable flight number was Delta 696 at 11:31 PM.

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

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SLC → BOS

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

On time (12 months)

82%

Cancelled

1.8%

avg delay 12 min

Best time to leave

After 9 PM

86% on time vs 77% 3 to 6 PM

Most reliable airline

Delta

82% chance on time

Check SLC to BOS 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 696

    11:31 PM → 6:10 AM4h 39m nonstop

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

    90%

    chance on time

    On time (history)
    92%
    Cancelled
    1.8%
    Avg arrival delay
    4 min
    • Arrived on time 92% of the time (331 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (After 9 PM: 86% on time; 3 to 6 PM: 77%).

    Strong track record · 331 flights

    Find Delta 696 fares Opens this date on Aviasales

  2. #2 · Delta 657

    10:00 AM → 4:32 PM4h 37m nonstop

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

    81%

    chance on time

    On time (history)
    82%
    Cancelled
    1.1%
    Avg arrival delay
    10 min
    • Arrived on time 82% of the time (361 flights, Jun 2025 to May 2026).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Strong track record · 361 flights

    Find Delta 657 fares Opens this date on Aviasales

  3. #3 · Delta 702

    5:30 PM → 11:59 PM4h 29m nonstop

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

    76%

    chance on time

    On time (history)
    77%
    Cancelled
    1.1%
    Avg arrival delay
    18 min
    • Arrived on time 77% of the time (359 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 77% on time; After 9 PM: 86%).

    Strong track record · 359 flights

    Find Delta 702 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines82%

    1,083 flights · 83% on time as flown · 1.4% cancel

On time by departure time

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

  • 9 AM to noon82%

    365 flights · avg delay 10 min

  • 3 to 6 PM77%

    364 flights · avg delay 18 min

  • After 9 PM86%

    483 flights · avg delay 8 min

Best day: Wednesday (84%). Worst: Thursday (76%).

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
82
M
80
A
83
M
82
J
72
J
74
A
78
S
78
O
85
N
88
D
78

What delays this route

  • Late-arriving aircraft36%
  • Airline (crew, maintenance, boarding)33%
  • Air traffic control and airport volume29%
  • Severe weather2%

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 SLC to BOS…

SLC to BOS questions

What time of day is best to fly SLC to BOS?
After 9 PM: 86% of flights arrived on time, against 77% for departures 3 to 6 PM.
Which airline is most on time from SLC to BOS?
Delta, with a season-adjusted 82% 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 SLC to BOS?
June (72% on time); the best was November (88%), 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