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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.

ORD → IAD

Chicago to Dulles: 2,021 nonstop flights a year

On time (12 months)

72%

Cancelled

0.6%

avg delay 21 min

Best time to leave

9 AM to noon

85% on time vs 52% 3 to 6 PM

Most reliable airline

United

72% chance on time

Check ORD to IAD fares

Lowest nonstop fare seen in the next two months: $147 (United 1055 on 2026-11-17). 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 · United 2277

    8:45 AM → 11:48 AM2h 03m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1357; its record covers all of them.

    83%

    chance on time

    On time (history)
    84%
    Cancelled
    1.3%
    Avg arrival delay
    10 min
    • Arrived on time 84% of the time (232 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Strong track record · 232 flights

    Find United 2277 fares Opens this date on Aviasales

  2. #2 · United 1869

    11:03 AM → 2:08 PM2h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1355; its record covers all of them.

    81%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 88% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Leaves in this route's most on-time window (9 AM to noon: 85% on time; 3 to 6 PM: 52%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Limited track record · 32 flights

    Find United 1869 fares Opens this date on Aviasales

  3. #3 · United 1689

    6:30 AM → 9:24 AM1h 54m nonstop

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

    79%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (10 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (10 flights), so its score leans on the airline's record at this hour.

    Limited track record · 10 flights

    Find United 1689 fares Opens this date on Aviasales

  4. #4 · United 1015

    9:55 PM → 12:59 AM2h 04m nonstop

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

    75%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 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 United 1015 fares Opens this date on Aviasales

  5. #5 · United 2052

    9:35 PM → 12:33 AM1h 58m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1892; its record covers all of them.

    73%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    32 min
    • Arrived on time 79% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (53 flights), so its score leans on the airline's record at this hour.

    Limited track record · 53 flights

    Find United 2052 fares Opens this date on Aviasales

  6. #6 · United 293

    1:00 PM → 4:03 PM2h 03m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2128; its record covers all of them.

    71%

    chance on time

    On time (history)
    73%
    Cancelled
    1.4%
    Avg arrival delay
    16 min
    • Arrived on time 73% of the time (142 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Moderate track record · 142 flights

    Find United 293 fares Opens this date on Aviasales

  7. #7 · United 587

    2:25 PM → 5:30 PM2h 03m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    69%

    chance on time

    On time (history)
    71%
    Cancelled
    0.4%
    Avg arrival delay
    18 min
    • Arrived on time 71% of the time (221 flights, Jun 2025 to May 2026).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 221 flights

    Find United 587 fares Opens this date on Aviasales

  8. #8 · United 2223

    6:01 PM → 9:04 PM2h 03m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    66%

    chance on time

    On time (history)
    66%
    Cancelled
    0.0%
    Avg arrival delay
    39 min
    • Arrived on time 66% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 58% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 32 flights

    Find United 2223 fares Opens this date on Aviasales

  9. #9 · United 488

    9:15 PM → 11:59 PM1h 44m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    65%

    chance on time

    On time (history)
    53%
    Cancelled
    5.6%
    Avg arrival delay
    36 min
    • Arrived on time 53% of the time (17 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (17 flights), so its score leans on the airline's record at this hour.

    Limited track record · 17 flights

    Find United 488 fares Opens this date on Aviasales

  10. #10 · United 2437

    4:20 PM → 7:23 PM2h 03m nonstop

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

    63%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    34 min
    • Arrived on time 64% of the time (64 flights, Jun 2025 to May 2026).
    • Never cancelled in 64 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 52% on time; 9 AM to noon: 85%).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.

    Moderate track record · 64 flights

    Find United 2437 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines72%

    2,021 flights · 72% on time as flown · 0.6% cancel

On time by departure time

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

  • Before 9 AM85%

    377 flights · avg delay 12 min

  • 9 AM to noon85%

    211 flights · avg delay 9 min

  • Noon to 3 PM71%

    719 flights · avg delay 19 min

  • 3 to 6 PM52%

    236 flights · avg delay 48 min

  • 6 to 9 PM67%

    195 flights · avg delay 27 min

  • After 9 PM69%

    283 flights · avg delay 25 min

Best day: Tuesday (79%). Worst: Sunday (74%).

Smarter routing

Nearby airports that run more on time

  • MDW → BWI 77% chance on time

    Chicago Midway International Airport to Baltimore/Washington International Thurgood Marshall Airport · 1,856 flights a year · 60 mi from your airports · yours: 72%

    Rank flightsFares

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