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Reliable Flight Search results

Chicago (ORD) → Seattle (SEA)

Best trips

14 nonstop, 30 with 1 connection · ranked by overall best · published legroom for 44 of 44

Fares seen on this date: nonstop from 146 (recent searches, one way, per person; each card opens the live price)

  1. Our best overall pick

    82% chance you arrive on time · nonstop · 30 in legroom · planes about 3 years old · 4h 38m

    Top pick#1 · Nonstop · 4h 38m

    1:10 PM → 3:48 PM

    64

    score

    price

    live on Aviasales

    82%

    arrive on time

    1:10 PM ORD → 3:48 PM SEA4h 38m

    United 1660

    Boeing 737 MAX 9 · 0–18 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United Economy
    83% on time · 0.6% cancel
    Find United 1660 fares Opens this date on Aviasales

  2. #2 · Nonstop · 4h 40m

    7:00 AM → 9:40 AM

    63

    score

    price

    live on Aviasales

    81%

    arrive on time

    7:00 AM ORD → 9:40 AM SEA4h 40m

    United 341

    Airbus A321neo · 0–2 yrs oldLegroom 30 in · 18.4 in wide · United Economy
    82% on time · 0.7% cancel
    Find United 341 fares Opens this date on Aviasales

  3. #3 · Nonstop · 4h 41m

    7:40 AM → 10:21 AM

    58

    score

    price

    live on Aviasales

    80%

    arrive on time

    7:40 AM ORD → 10:21 AM SEA4h 41m

    Alaska 515

    Boeing 737-900ER or 737-800 · 4–20 yrs oldLegroom 30–32 in · 16.5–17.3 in wide · Main Cabin
    81% on time · 1.3% cancel
    Find Alaska 515 fares Opens this date on Aviasales

  4. #4 · Nonstop · 4h 44m

    9:06 AM → 11:48 AM

    58

    score

    price

    live on Aviasales

    78%

    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 30–31 in · 16.3–18.4 in wide · United Economy
    78% on time · 0.4% cancel
    Find United 2099 fares Opens this date on Aviasales

  5. #5 · Nonstop · 4h 32m

    6:00 AM → 8:32 AM

    57

    score

    price

    live on Aviasales

    77%

    arrive on time

    6:00 AM ORD → 8:32 AM SEA4h 32m

    Alaska 715

    Boeing 737 MAX 9 or 737-900ER · 2–13 yrs oldLegroom 30–32 in · 16.5–17.3 in wide · Main Cabin
    78% on time · 1.0% cancel
    Find Alaska 715 fares Opens this date on Aviasales

  6. #6 · Nonstop · 4h 40m

    4:20 PM → 7:00 PM

    51

    score

    price

    live on Aviasales

    72%

    arrive on time

    4:20 PM ORD → 7:00 PM SEA4h 40m

    United 1801

    Airbus A321neo · 1–2 yrs oldLegroom 30 in · 18.4 in wide · United Economy
    72% on time · 0.8% cancel
    Find United 1801 fares Opens this date on Aviasales

  7. #7 · Nonstop · 4h 44m

    7:30 AM → 10:14 AM

    50

    score

    price

    live on Aviasales

    74%

    arrive on time

    7:30 AM ORD → 10:14 AM SEA4h 44m

    American 2775

    Airbus A321 · 10–24 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    75% on time · 1.5% cancel
    Find American 2775 fares Opens this date on Aviasales

  8. #8 · 1 connection · 6h 46m · one ticket (United)

    5:00 AM → 9:46 AM

    50

    score

    price

    live on Aviasales

    92%

    connections made

    82%

    arrive on time

    5:00 AM ORD → 6:41 AM DEN2h 41m

    United 2666

    Airbus A321neo · 1–13 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United Economy
    93% on time · 0.5% cancel
    Connect in DEN · 1h 04m · 93% chance to make it · same ticket: the airline rebooks you if you miss it

    7:45 AM DEN → 9:46 AM SEA3h 01m

    United 2271

    Boeing 737-800 or 737-900ER · 1–27 yrs oldLegroom 30–31 in · 16.3–18.4 in wide · United Economy
    90% on time · 0.9% cancel
    Find this United trip Look for United 2666 + United 2271 on Aviasales

  9. #9 · 1 connection · 8h 09m · one ticket (United)

    7:05 AM → 1:14 PM

    48

    score

    price

    live on Aviasales

    96%

    connections made

    84%

    arrive on time

    7:05 AM ORD → 9:39 AM PDX4h 34m

    United 2300

    Airbus A321neo · 1–2 yrs oldLegroom 30 in · 18.4 in wide · United Economy
    83% on time · 0.4% cancel
    Connect in PDX · 2h 34m · 97% chance to make it · same ticket: the airline rebooks you if you miss it

    12:13 PM PDX → 1:14 PM SEA1h 01m

    SkyWest 3038 · sold as United Express

    Embraer E175 · 4–11 yrs oldLegroom 31 in · 18–18.2 in wide · United Economy
    88% on time · 0.4% cancel
    Find this United trip Look for United 2300 + SkyWest 3038 on Aviasales

  10. #10 · 1 connection · 8h 20m · one ticket (United)

    7:05 AM → 1:25 PM

    48

    score

    price

    live on Aviasales

    96%

    connections made

    84%

    arrive on time

    7:05 AM ORD → 9:39 AM PDX4h 34m

    United 2300

    Airbus A321neo · 1–2 yrs oldLegroom 30 in · 18.4 in wide · United Economy
    83% on time · 0.4% cancel
    Connect in PDX · 2h 41m · 97% chance to make it · same ticket: the airline rebooks you if you miss it

    12:20 PM PDX → 1:25 PM SEA1h 05m

    SkyWest 3802 · sold as United Express

    Embraer E175 · 4–18 yrs oldLegroom 31 in · 18–18.2 in wide · United Economy
    88% on time · 0.8% cancel
    Find this United trip Look for United 2300 + SkyWest 3802 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.

ORD → SEA

Chicago to Seattle: 5,561 nonstop flights a year

On time (12 months)

69%

Cancelled

1.3%

avg delay 22 min

Best time to leave

Before 9 AM

79% on time vs 50% after 9 PM

Most reliable airline

United

73% chance on time

Check ORD to SEA fares

Lowest nonstop fare seen in the next two months: $146 (American 2398 on 2026-11-13). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines73%

    1,540 flights · 73% on time as flown · 0.7% cancel

  • Delta Air Lines67%

    898 flights · 68% on time as flown · 1.2% cancel

  • Alaska Airlines67%

    1,803 flights · 67% on time as flown · 1.4% cancel

  • American Airlines63%

    1,320 flights · 65% on time as flown · 1.9% cancel

On time by departure time

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

  • Before 9 AM79%

    1,665 flights · avg delay 14 min

  • 9 AM to noon70%

    827 flights · avg delay 20 min

  • Noon to 3 PM75%

    748 flights · avg delay 18 min

  • 3 to 6 PM63%

    1,071 flights · avg delay 26 min

  • 6 to 9 PM55%

    996 flights · avg delay 30 min

  • After 9 PM50%

    254 flights · avg delay 39 min

Best day: Tuesday (77%). Worst: Friday (72%).

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