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Reliable Flight Search

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The insider way to pick a flight: on-time records, the odds each connection is made, legroom and the age of the planes that actually fly the route. Things airline sites and the big booking sites don’t show you. US airlines and airports.

Find me the most reliable flights fromtoonreturning(optional)

ORD → PDX

Chicago to Portland: 2,730 nonstop flights a year

On time (12 months)

71%

Cancelled

0.8%

avg delay 19 min

Best time to leave

Before 9 AM

84% on time vs 47% after 9 PM

Most reliable airline

United

73% chance on time

Check ORD to PDX fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

11 nonstop, 33 with 1 connection · ranked by overall best · published legroom for 3 of 44

  1. Top pick#1 · Nonstop · 4h 34m

    7:05 AM → 9:39 AM

    81

    score

    82%

    arrive on time

    7:05 AM ORD → 9:39 AM PDX4h 34m

    United 2300

    Airbus A321neo · 1–2 yrs oldLegroom: not published for this aircraft and cabin yet
    83% on time · 0.4% cancel
    Find United 2300 fares Opens this date on Aviasales

  2. #2 · Nonstop · 4h 37m

    9:10 AM → 11:46 AM

    79

    score

    84%

    arrive on time

    9:10 AM ORD → 11:46 AM PDX4h 37m

    United 1994

    Boeing 737-900ER or 737 MAX 8 · 2–16 yrs oldLegroom: not published for this aircraft and cabin yet
    84% on time · 0.2% cancel
    Find United 1994 fares Opens this date on Aviasales

  3. #3 · Nonstop · 4h 30m

    7:29 AM → 9:59 AM

    67

    score

    79%

    arrive on time

    7:29 AM ORD → 9:59 AM PDX4h 30m

    American 2284

    Airbus A321 or Boeing 737-800 · 9–25 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    80% on time · 1.2% cancel
    Find American 2284 fares Opens this date on Aviasales

  4. #4 · Nonstop · 4h 29m

    12:40 PM → 3:09 PM

    64

    score

    78%

    arrive on time

    12:40 PM ORD → 3:09 PM PDX4h 29m

    United 1554

    Boeing 737-900ER or 737-800 · 4–27 yrs oldLegroom: not published for this aircraft and cabin yet
    78% on time · 0.3% cancel
    Find United 1554 fares Opens this date on Aviasales

  5. #5 · Nonstop · 4h 27m

    1:29 PM → 3:56 PM

    61

    score

    79%

    arrive on time

    1:29 PM ORD → 3:56 PM PDX4h 27m

    United 1525

    Boeing 737-800 · 16–28 yrs oldLegroom: not published for this aircraft and cabin yet
    79% on time · 0.4% cancel
    Find United 1525 fares Opens this date on Aviasales

  6. #6 · 1 connection · 6h 48m · one ticket (United)

    5:00 AM → 9:48 AM

    55

    score

    95%

    connections made

    84%

    arrive on time

    5:00 AM ORD → 6:41 AM DEN2h 41m

    United 2666

    Airbus A321neo · 1–13 yrs oldLegroom: not published for this aircraft and cabin yet
    93% on time · 0.5% cancel
    Connect in DEN · 1h 19m · 96% chance to make it · same ticket: the airline rebooks you if you miss it

    8:00 AM DEN → 9:48 AM PDX2h 48m

    United 1247

    Boeing 737-900ER or 737-800 · 10–26 yrs oldLegroom: not published for this aircraft and cabin yet
    88% on time · 0.1% cancel
    Find this United trip Look for United 2666 + United 1247 on Aviasales

  7. #7 · 1 connection · 7h 44m · one ticket (United)

    9:06 AM → 2:48 PM

    55

    score

    94%

    connections made

    85%

    arrive on time

    9:06 AM ORD → 11:48 AM SEA4h 44m

    United 2099

    Airbus A321neo or Boeing 737 MAX 9 · 1–27 yrs oldLegroom: not published for this aircraft and cabin yet
    78% on time · 0.4% cancel
    Connect in SEA · 1h 52m · 95% chance to make it · same ticket: the airline rebooks you if you miss it

    1:40 PM SEA → 2:48 PM PDX1h 08m

    SkyWest 4062 · sold as United Express · also flew as 3282

    Embraer E175 · 4–10 yrs oldLegroom: not published for this aircraft and cabin yet
    90% on time · 0.3% cancel
    Find this United trip Look for United 2099 + SkyWest 4062 on Aviasales

  8. #8 · Nonstop · 4h 26m

    12:09 PM → 2:35 PM

    53

    score

    73%

    arrive on time

    12:09 PM ORD → 2:35 PM PDX4h 26m

    American 2545

    Airbus A321 · 10–24 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    74% on time · 0.7% cancel
    Find American 2545 fares Opens this date on Aviasales

  9. #9 · 1 connection · 9h 19m · one ticket (United)

    1:59 PM → 9:18 PM

    50

    score

    97%

    connections made

    88%

    arrive on time

    1:59 PM ORD → 4:37 PM SEA4h 38m

    United 623

    Boeing 737 MAX 8 · 1–10 yrs oldLegroom: not published for this aircraft and cabin yet
    86% on time · 0.6% cancel
    Connect in SEA · 3h 38m · 97% chance to make it · same ticket: the airline rebooks you if you miss it

    8:15 PM SEA → 9:18 PM PDX1h 03m

    SkyWest 3997 · sold as United Express

    Embraer E175 · 6–8 yrs oldLegroom: not published for this aircraft and cabin yet
    90% on time · 0.2% cancel
    Find this United trip Look for United 623 + SkyWest 3997 on Aviasales

  10. #10 · 1 connection · 8h 31m · one ticket (American)

    9:57 AM → 4:28 PM

    49

    score

    95%

    connections made

    87%

    arrive on time

    9:57 AM ORD → 12:37 PM SLC3h 40m

    American 2862

    Boeing 737-800 · 10–26 yrs oldLegroom 30 in · 16.6–17.8 in wide · Main Cabin · covers 93% of recent planes
    70% on time · 1.3% cancel
    Connect in SLC · 2h 45m · 96% chance to make it · same ticket: the airline rebooks you if you miss it

    3:22 PM SLC → 4:28 PM PDX2h 06m

    SkyWest 3360 · sold as American Eagle

    Embraer E175 · 4–10 yrs oldLegroom: not published for this aircraft and cabin yet
    92% on time · 0.4% cancel
    Find this American trip Look for American 2862 + SkyWest 3360 on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes. Legroom is the seat pitch the airline or a seat-map source publishes for that aircraft and cabin; we never estimate it, and seat maps change, so check the airline’s seat map when you book.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines73%

    1,386 flights · 73% on time as flown · 0.5% cancel

  • Alaska Airlines72%

    515 flights · 73% on time as flown · 0.9% cancel

  • American Airlines64%

    829 flights · 65% on time as flown · 1.2% cancel

On time by departure time

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

  • Before 9 AM84%

    476 flights · avg delay 9 min

  • 9 AM to noon79%

    459 flights · avg delay 12 min

  • Noon to 3 PM74%

    723 flights · avg delay 16 min

  • 3 to 6 PM68%

    403 flights · avg delay 25 min

  • 6 to 9 PM57%

    499 flights · avg delay 30 min

  • After 9 PM47%

    170 flights · avg delay 37 min

Best day: Tuesday (78%). Worst: Friday (73%).

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