Philadelphia (PHL) – Seattle (SEA)
- Distance
- 3,827 km
- 2,378 mi · 2,067 nm
- Flight time
- 6 h 5 min / 5 h 2 min
- Average gate to gate: PHL → SEA / back
- Time difference
- 3 h
- CO2 per passenger
- 447 kg
- One way, economy, incl. RF (264 kg CO2 only)
- Passengers / year
- 428,381
- Aug 2025 – Jul 2026 · +29.8%
- Flights / week
- 52
- Both directions, average
- Seats filled
- 86%
- 499,470 seats a year
- Airlines nonstop
- 3
- AA, AS, DL
Traffic: U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service), Aug 2025 – Jul 2026. Distance: WGS-84 ellipsoid. CO2: UK DESNZ 2026 factors. Sources
The way there
- Heading from PHL
- 299°
- Heading from SEA
- 85°
- Halfway point
- 46.15, -97.20
- Great-circle km
- 3,818 km (sphere, for EU261)
- In the air PHL → SEA
- 5 h 26 min
- In the air SEA → PHL
- 4 h 31 min
- Clocks
- Seattle is 3 h behind Philadelphia
The estimate for a route without real times is 5 h 20 min; how it is worked out is on Sources.
Show as a table
| Month | Passengers |
|---|---|
| Aug 2025 | 47,476 |
| Sep 2025 | 39,573 |
| Oct 2025 | 36,456 |
| Nov 2025 | 24,884 |
| Dec 2025 | 28,493 |
| Jan 2026 | 17,557 |
| Feb 2026 | 14,774 |
| Mar 2026 | 23,397 |
| Apr 2026 | 34,242 |
| May 2026 | 47,960 |
| Jun 2026 | 53,144 |
| Jul 2026 | 60,425 |
Show as a table
| Month | Flights |
|---|---|
| Aug 2025 | 269 |
| Sep 2025 | 243 |
| Oct 2025 | 242 |
| Nov 2025 | 173 |
| Dec 2025 | 184 |
| Jan 2026 | 127 |
| Feb 2026 | 106 |
| Mar 2026 | 147 |
| Apr 2026 | 228 |
| May 2026 | 313 |
| Jun 2026 | 339 |
| Jul 2026 | 353 |
Airlines flying PHL–SEA nonstop
| Airline | Flights / week | Share of passengers |
|---|---|---|
| AAAmerican Airlines | 24 | 48% |
| ASAlaska Airlines | 25 | 47% |
| DLDelta Air Lines | 3.2 | 6% |
Both directions, Aug 2025 – Jul 2026. Airlines with at least one flight a month. U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service). Sources
Aircraft on this route
- Airbus Industrie A321Neoxlr · 821 flights
- Boeing 737-900ER · 646 flights
- Boeing B737 Max 900 · 583 flights
- Airbus Industrie A321-200n · 445 flights
- Boeing 737-800 · 129 flights
- Boeing B737 Max 800 · 100 flights
Also carried: 339 tonnes of freight and 34 tonnes of mail a year (passenger and cargo flights).
Punctuality
- On time
- 76.2%
- Arrived within 15 min of schedule
- Average delay
- 14 min
- Late arrivals count, early ones as 0
- Cancelled
- 1.7%
- Flights counted
- 2,776
- Aug 2025 – Jul 2026
| Airline | On time | Average delay |
|---|---|---|
| ASAlaska Airlines | 74.5% | 13 min |
| AAAmerican Airlines | 77.9% | 15 min |
| DLDelta Air Lines | 76.7% | 17 min |
Delay minutes by cause: airline 29% · aircraft arriving late 31% · air traffic system 30% · weather 9% · security 0%.
Both directions, Aug 2025 – Jul 2026. BTS Reporting Carrier On-Time Performance (US domestic flights of the larger US airlines). Sources
What passengers paid
- Average fare, Q1 2026
- $321
- One way, all cabins
- Average over a year
- $327
- Q3 2025 – Q1 2026
- Largest airline
- Alaska Airlines
- 49% of passengers · $329
- Lowest-fare airline
- American Airlines
- 39% of passengers · $298
History, not a price to book: what the average passenger paid per one-way trip in each quarter (Q3 2025 $334 · Q4 2025 $321 · Q1 2026 $321).
U.S. DOT Consumer Airfare Report, Table 1a (airline ticket sample, US domestic airport pairs). Sources
Delay compensation (EU261 / UK261)
Measured by great-circle distance: 3,818 km.
Neither EU261 nor UK261 covers this route: it neither starts nor ends in the EU, EEA, Switzerland or the UK. Other countries have their own rules (for example Canada's APPR or Brazil's ANAC rules).
Also owed for a cancellation with less than 14 days' notice or denied boarding. Not owed for extraordinary circumstances. On a connection, the distance to the final destination counts. From 23 October 2027 the EU's Regulation 2026/2202 applies; it keeps these amounts (what changes in 2027). Information, not legal advice.
Every airport pair between Philadelphia and Seattle
Kilometres. Linked numbers have a page of their own. All Seattle airports
More routes from PHL
More routes from SEA
| Route | Distance | Passengers / year |
|---|---|---|
| SEA → DEN | 1,648 km | 1,819,437 |
| SEA → PHX | 1,781 km | 1,813,338 |
| SEA → LAX | 1,535 km | 1,810,795 |
| SEA → ANC | 2,331 km | 1,694,688 |
| SEA → SFO | 1,092 km | 1,628,228 |
| SEA → ORD | 2,769 km | 1,622,991 |
| SEA → LAS | 1,394 km | 1,596,435 |
| SEA → DFW | 2,671 km | 1,577,921 |
| SEA → SAN | 1,690 km | 1,233,726 |
| SEA → SLC | 1,108 km | 1,106,553 |