Seattle (SEA) to Chicago (ORD) flights

Alaska Airlines, United Airlines, American Airlines, Delta Air Lines fly nonstop from Seattle-Tacoma International Airport to Chicago O'Hare International Airport, with about 133 flights a week in July 2026. The 1,721-mile flight takes about 4h 4m gate to gate.

From

SEA

Seattle

Seattle-Tacoma International Airport

ORD

Chicago

Chicago O'Hare International Airport

Distance: 1,721 mi · 2,770 km
Flight time: 4h 4m
Airlines: 4
Seats filled: 86%

Flights a week, July 2026

5,433 flights and 809,500 passengers in 12 months

Map data: Natural Earth. Lines follow the shortest (great-circle) path.

Airlines flying SEA to ORD

Airline	Flights a week	Aircraft	Passengers (12 months)	Flight time
Alaska Airlines	45	Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800	266,978	4h 5m
United Airlines	34	Airbus A321, Boeing 737-800, Boeing 737-900ER	233,138	4h 3m
American Airlines	34	Boeing 737-800, Airbus A321, Boeing 737 MAX 8	200,456	4h 6m
Delta Air Lines	20	Boeing 737-800, Airbus A220-300, Boeing 737-900ER	108,928	4h 2m

Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.

SEA to ORD flight schedule

26 flight numbers flew this route in August 2026, 18 of them almost daily. The first usually leaves at 12:17am and the last at 11:56pm. Times are local and can change; check with the airline before you book.

Flight	Departs	Arrives	Days flown in August 2026	On time (12 months)
AS 328Alaska Airlines	12:17am	6:20am	29	83%
AA 1872American Airlines	5:50am	12:07pm	27	93%
AA 2922American Airlines	6:00am	12:12pm	4	95%
AS 578Alaska Airlines	6:00am	12:03pm	18	83%
UA 2618United Airlines	7:00am	1:15pm	31	91%
DL 2055Delta Air Lines	7:15am	1:23pm	31	83%
AS 265Alaska Airlines	8:34am	2:46pm	31	77%
AA 3234American Airlines	10:19am	4:46pm	27	59%
AA 2523American Airlines	10:22am	4:53pm	4	75%
AS 429Alaska Airlines	10:29am	4:44pm	31	56%
UA 2835United Airlines	10:41am	4:59pm	31	74%
DL 637Delta Air Lines	10:50am	5:00pm	31	69%
AS 346Alaska Airlines	11:29am	5:38pm	10	24%
AS 410Alaska Airlines	1:10pm	7:21pm	30	71%
AA 2966American Airlines	1:24pm	7:59pm	27	52%
UA 2101United Airlines	1:57pm	8:18pm	31	67%
AA 2520American Airlines	2:09pm	8:45pm	4	46%
AA 2524American Airlines	3:28pm	10:00pm	4	59%
AA 1476American Airlines	3:35pm	10:07pm	27	67%
UA 1265United Airlines	5:13pm	11:17pm	21	67%
UA 1503United Airlines	5:15pm	11:22pm	10	82%
DL 2108Delta Air Lines	5:35pm	11:29pm	31	73%
AS 538Alaska Airlines	5:48pm	11:59pm	31	83%
UA 747United Airlines	11:00pm	5:06am	31	88%
AA 2379American Airlines	11:56pm	6:05am	27	100%
AA 2881American Airlines	11:56pm	6:02am	4	93%

Is SEA to ORD on time?

From September 2025 to August 2026, 77% of 5,538 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 7am were the most punctual (87%), those around 1pm the least (59%). Most delay time was caused by air traffic control and airport congestion (38%).

Airline	Flights	On time	Average delay	Cancelled
Alaska Airlines	1,775	74%	17 min	1.1%
United Airlines	1,488	82%	17 min	0.8%
American Airlines	1,353	76%	26 min	1.6%
Delta Air Lines	922	76%	19 min	1.3%

Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.

On-time arrivals by departure time

Scheduled departure	Flights	On time
12am to 1am	400	82%
6am to 7am	262	89%
7am to 8am	805	87%
8am to 9am	360	75%
10am to 11am	935	73%
11am to 12pm	263	62%
12pm to 1pm	115	72%
1pm to 2pm	464	59%
2pm to 3pm	247	69%
3pm to 4pm	239	70%
5pm to 6pm	796	78%
11pm to 12am	418	86%

Flights by month

Month	Flights	Passengers
August 2025	581	97,292
September 2025	508	81,461
October 2025	491	73,150
November 2025	373	51,625
December 2025	377	52,371
January 2026	296	39,482
February 2026	298	38,623
March 2026	342	50,192
April 2026	454	64,216
May 2026	557	76,476
June 2026	570	89,896
July 2026	587	95,003

Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.