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Route on-time record

SAN to TUS: most on-time flights and the best time to fly

San Diego (San Diego International Airport) to Tucson (Tucson International Airport). 653 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 4139 at 8:35 AM.

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

SAN → TUS

San Diego to Tucson: 653 nonstop flights a year

On time (12 months)

76%

Cancelled

0.5%

avg delay 15 min

Best time to leave

9 AM to noon

88% on time vs 47% after 9 PM

Most reliable airline

Southwest

75% chance on time

Check SAN to TUS 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 · Southwest 4139

    8:35 AM → 10:05 AM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 37, 3752; its record covers all of them.

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 89% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
    • Short track record (46 flights), so its score leans on the airline's record at this hour.

    Limited track record · 46 flights

    Find Southwest 4139 fares Opens this date on Aviasales

  2. #2 · Southwest 2901

    8:50 AM → 10:20 AM1h 30m nonstop

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

    83%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 2901 fares Opens this date on Aviasales

  3. #3 · Southwest 287

    7:50 PM → 9:20 PM1h 30m nonstop

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

    74%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 74% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
    • 68% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 39 flights

    Find Southwest 287 fares Opens this date on Aviasales

  4. #4 · Southwest 1863

    8:00 PM → 9:30 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    68%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 71% of the time (28 flights, Jun 2025 to May 2026).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
    • 62% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find Southwest 1863 fares Opens this date on Aviasales

  5. #5 · Southwest 3900

    12:15 PM → 1:40 PM1h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-27.

    61%

    chance on time

    On time (history)
    31%
    Cancelled
    0.0%
    Avg arrival delay
    40 min
    • Arrived on time 31% of the time (16 flights, Jun 2025 to May 2026).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
    • 90% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 3900 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines75%

    653 flights · 76% on time as flown · 0.5% cancel

On time by departure time

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

  • Before 9 AM87%

    143 flights · avg delay 10 min

  • 9 AM to noon88%

    130 flights · avg delay 7 min

  • Noon to 3 PM66%

    50 flights · avg delay 18 min

  • 3 to 6 PM81%

    93 flights · avg delay 15 min

  • 6 to 9 PM65%

    205 flights · avg delay 23 min

  • After 9 PM47%

    32 flights · avg delay 23 min

Best day: Wednesday (83%). Worst: Thursday (73%).

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
83
F
81
M
82
A
78
M
72
J
75
J
68
A
75
S
79
O
77
N
82
D
75

What delays this route

  • Late-arriving aircraft68%
  • Airline (crew, maintenance, boarding)26%
  • Air traffic control and airport volume5%

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

SAN to TUS questions

What time of day is best to fly SAN to TUS?
9 AM to noon: 88% of flights arrived on time, against 47% for departures after 9 PM.
Which airline is most on time from SAN to TUS?
Southwest, with a season-adjusted 75% chance of operating and arriving on time over 653 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 SAN to TUS?
July (68% on time); the best was January (83%), 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 SAN

Live status: FAA delays and ground stops