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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

SLC → MDW

Salt Lake City to Chicago: 617 nonstop flights a year

On time (12 months)

85%

Cancelled

0.8%

avg delay 6 min

Best time to leave

Before 9 AM

95% on time vs 67% 3 to 6 PM

Most reliable airline

Southwest

84% chance on time

Check SLC to MDW 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 2950

    7:15 AM → 11:15 AM3h 00m nonstop

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

    92%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (22 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 95% on time; 3 to 6 PM: 67%).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (22 flights), so its score leans on the airline's record at this hour.

    Limited track record · 22 flights

    Find Southwest 2950 fares Opens this date on Aviasales

  2. #2 · Southwest 4471

    6:50 AM → 10:55 AM3h 05m nonstop

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

    88%

    chance on time

    On time (history)
    91%
    Cancelled
    3.0%
    Avg arrival delay
    8 min
    • Arrived on time 91% of the time (32 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (1 of 33).
    • Leaves in this route's most on-time window (Before 9 AM: 95% on time; 3 to 6 PM: 67%).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 32 flights

    Find Southwest 4471 fares Opens this date on Aviasales

  3. #3 · Southwest 3434

    7:45 AM → 11:45 AM3h 00m nonstop

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

    87%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 81% of the time (16 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 95% on time; 3 to 6 PM: 67%).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 3434 fares Opens this date on Aviasales

  4. #4 · Southwest 3214

    1:20 PM → 5:15 PM2h 55m nonstop

    Local times, typical schedule. Last flown 2026-04-01.

    73%

    chance on time

    On time (history)
    50%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 50% of the time (8 flights, Jun 2025 to May 2026).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 3214 fares Opens this date on Aviasales

  5. #5 · Southwest 1418

    1:45 PM → 5:40 PM2h 55m nonstop

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

    71%

    chance on time

    On time (history)
    58%
    Cancelled
    4.0%
    Avg arrival delay
    15 min
    • Arrived on time 58% of the time (24 flights, Jun 2025 to May 2026).
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find Southwest 1418 fares Opens this date on Aviasales

  6. #6 · Southwest 2899

    2:00 PM → 6:00 PM3h 00m nonstop

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

    68%

    chance on time

    On time (history)
    56%
    Cancelled
    1.8%
    Avg arrival delay
    13 min
    • Arrived on time 56% of the time (52 flights, Jun 2025 to May 2026).
    • Short track record (52 flights), so its score leans on the airline's record at this hour.

    Limited track record · 52 flights

    Find Southwest 2899 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines84%

    617 flights · 85% on time as flown · 0.8% cancel

On time by departure time

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

  • Before 9 AM95%

    352 flights · avg delay 3 min

  • Noon to 3 PM72%

    210 flights · avg delay 10 min

  • 3 to 6 PM67%

    45 flights · avg delay 17 min

Best day: Monday (89%). Worst: Tuesday (83%).

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