Portland (PDX) to Seattle (SEA) flights

SkyWest Airlines, Horizon Air, Alaska Airlines fly nonstop from Portland International Airport to Seattle-Tacoma International Airport, with about 137 flights a week in July 2026. The 129-mile flight takes about 1h 2m gate to gate.

From

PDX

Portland

Portland International Airport

SEA

Seattle

Seattle-Tacoma International Airport

Distance: 129 mi · 208 km
Flight time: 1h 2m
Airlines: 3
Seats filled: 79%

Flights a week, July 2026

6,579 flights and 486,616 passengers in 12 months

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

Airlines flying PDX to SEA

Airline	Flights a week	Aircraft	Passengers (12 months)	Flight time
SkyWest Airlines	75	Embraer E175, Bombardier CRJ700	205,751	1h 4m
Horizon Air	40	Embraer E175	104,322	57m
Alaska Airlines	21	Boeing 737-900ER, Boeing 737-800, Boeing 737 MAX 9	151,538	1h 4m
Delta Air LinesSeasonal or ended	n/a	Airbus A220-100, Boeing 737-800, Airbus A220-300	25,005	1h 1m

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

PDX to SEA flight schedule

31 flight numbers flew this route in August 2026, 9 of them almost daily. The first usually leaves at 5:00am and the last at 9:32pm. 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 2431Alaska Airlines · operated by Horizon Air	5:00am	5:53am	18	94%
AS 2258Alaska Airlines · operated by Horizon Air	5:07am	6:00am	13	100%
DL 4008Delta Air Lines · operated by SkyWest Airlines	5:30am	6:37am	31	94%
AS 499Alaska Airlines	6:19am	7:17am	31	93%
DL 4471Delta Air Lines · operated by SkyWest Airlines	7:05am	8:17am	31	88%
AS 1860Alaska Airlines	7:09am	8:24am	13	77%
AS 2420Alaska Airlines · operated by Horizon Air	7:19am	8:20am	18	97%
AS 2190Alaska Airlines · operated by Horizon Air	8:07am	9:03am	13	88%
AS 2108Alaska Airlines · operated by Horizon Air	8:19am	9:14am	18	90%
AS 427Alaska Airlines	9:19am	10:21am	18	49%
DL 3953Delta Air Lines · operated by SkyWest Airlines	9:29am	10:55am	31	83%
AS 2257Alaska Airlines · operated by Horizon Air	9:30am	10:29am	13	69%
AS 3201Alaska Airlines · operated by SkyWest Airlines	10:30am	11:45am	11	100%
AS 3431Alaska Airlines · operated by SkyWest Airlines	10:35am	11:43am	18	81%
DL 3818Delta Air Lines · operated by SkyWest Airlines	11:22am	12:40pm	31	91%
AS 1536Alaska Airlines	11:48am	12:50pm	13	69%
AS 3078Alaska Airlines · operated by SkyWest Airlines	12:03pm	1:03pm	18	83%
DL 3802Delta Air Lines · operated by SkyWest Airlines	12:25pm	1:35pm	31	85%
AS 2205Alaska Airlines · operated by Horizon Air	1:48pm	2:43pm	18	63%
AS 2243Alaska Airlines · operated by Horizon Air	1:59pm	2:55pm	13	92%
AS 2055Alaska Airlines · operated by Horizon Air	3:00pm	3:55pm	13	69%
DL 4062Delta Air Lines · operated by SkyWest Airlines	3:25pm	4:37pm	31	88%
AS 3408Alaska Airlines · operated by SkyWest Airlines	3:30pm	4:30pm	18	75%
AS 430Alaska Airlines	5:30pm	6:33pm	17	74%
AS 743Alaska Airlines	5:41pm	6:51pm	13	77%
DL 3918Delta Air Lines · operated by SkyWest Airlines	5:54pm	7:05pm	31	84%
AS 2313Alaska Airlines · operated by Horizon Air	7:38pm	8:33pm	12	44%
AS 2092Alaska Airlines · operated by Horizon Air	7:40pm	8:35pm	11	27%
DL 3923Delta Air Lines · operated by SkyWest Airlines	8:24pm	9:38pm	26	68%
AS 2421Alaska Airlines · operated by Horizon Air	8:30pm	9:27pm	18	80%
AS 452Alaska Airlines	9:32pm	10:39pm	13	92%

Is PDX to SEA on time?

From September 2025 to August 2026, 84% of 6,528 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 5am were the most punctual (95%), those around 9am the least (75%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (42%).

Airline	Flights	On time	Average delay	Cancelled
Alaska Airlines	3,872	82%	10 min	1%
Delta Air Lines	2,656	87%	8 min	0.3%

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
5am to 6am	502	95%
6am to 7am	359	92%
7am to 8am	654	89%
8am to 9am	181	87%
9am to 10am	704	75%
10am to 11am	425	86%
11am to 12pm	321	90%
12pm to 1pm	256	82%
1pm to 2pm	525	83%
2pm to 3pm	283	86%
3pm to 4pm	477	84%
5pm to 6pm	649	82%
7pm to 8pm	468	77%
8pm to 9pm	268	76%
9pm to 10pm	274	86%

Flights by month

Month	Flights	Passengers
August 2025	638	44,588
September 2025	584	43,639
October 2025	579	43,555
November 2025	504	38,481
December 2025	533	40,388
January 2026	485	37,835
February 2026	438	34,753
March 2026	538	41,888
April 2026	549	37,190
May 2026	563	39,237
June 2026	571	42,581
July 2026	607	43,934

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