Philadelphia (PHL) to Seattle (SEA) · Dec 19, 2026 · one way

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Route overview: Philadelphia to Seattle (SEA) flight deals

2026-12-19 · one way · Axel-exclusive $280.00

• Alaska Airlines AS443: PHL 2026-12-19 18:46:00 → SEA 2026-12-19 21:56:00; nonstop; 370 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $294.00

• American Airlines AA2500: PHL 2026-12-19 18:48:00 → SEA 2026-12-19 22:17:00; nonstop; 389 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $301.00

• Delta Air Lines DL2092: PHL 2026-12-19 07:00:00 → SEA 2026-12-19 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $266.00

• Southwest Airlines WN2108 / WN3032: PHL 2026-12-19 18:20:00 → SEA 2026-12-19 23:35:00; 1 stop(s) via MDW; 495 minutes. Local airport times.
  • WN2108: PHL 2026-12-19 18:20:00 → MDW 2026-12-19 19:35:00; layover at MDW: 70 minutes.
  • WN3032: MDW 2026-12-19 20:45:00 → SEA 2026-12-19 23:35:00.

2026-12-19 · one way · Axel-exclusive $273.00

• United Airlines UA1811 / UA1660: PHL 2026-12-19 09:45:00 → SEA 2026-12-19 15:32:00; 1 stop(s) via ORD; 527 minutes. Local airport times.
  • UA1811: PHL 2026-12-19 09:45:00 → ORD 2026-12-19 11:20:00; layover at ORD: 85 minutes.
  • UA1660: ORD 2026-12-19 12:45:00 → SEA 2026-12-19 15:32:00.

2026-12-19 · one way · Axel-exclusive $280.00

• Alaska Airlines AS370: PHL 2026-12-19 07:02:00 → SEA 2026-12-19 10:29:00; nonstop; 387 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $294.00

• American Airlines AA467: PHL 2026-12-19 08:45:00 → SEA 2026-12-19 12:19:00; nonstop; 394 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $266.00

• Southwest Airlines WN1270 / WN3141: PHL 2026-12-19 17:15:00 → SEA 2026-12-19 22:50:00; 1 stop(s) via DEN; 515 minutes. Local airport times.
  • WN1270: PHL 2026-12-19 17:15:00 → DEN 2026-12-19 19:25:00; layover at DEN: 75 minutes.
  • WN3141: DEN 2026-12-19 20:40:00 → SEA 2026-12-19 22:50:00.

2026-12-19 · one way · Axel-exclusive $273.00

• Delta Air Lines DL2791 / DL868: PHL 2026-12-19 05:34:00 → SEA 2026-12-19 10:42:00; 1 stop(s) via MSP; 488 minutes. Local airport times.
  • DL2791: PHL 2026-12-19 05:34:00 → MSP 2026-12-19 07:35:00; layover at MSP: 70 minutes.
  • DL868: MSP 2026-12-19 08:45:00 → SEA 2026-12-19 10:42:00.

2026-12-19 · one way · Axel-exclusive $273.00

• Delta Air Lines DL2968 / DL728: PHL 2026-12-19 09:43:00 → SEA 2026-12-19 14:55:00; 1 stop(s) via DTW; 492 minutes. Local airport times.
  • DL2968: PHL 2026-12-19 09:43:00 → DTW 2026-12-19 11:35:00; layover at DTW: 78 minutes.
  • DL728: DTW 2026-12-19 12:53:00 → SEA 2026-12-19 14:55:00.

2026-12-19 · one way · Axel-exclusive $273.00

• Delta Air Lines DL2023 / DL2995: PHL 2026-12-19 07:15:00 → SEA 2026-12-19 12:36:00; 1 stop(s) via SLC; 501 minutes. Local airport times.
  • DL2023: PHL 2026-12-19 07:15:00 → SLC 2026-12-19 10:15:00; layover at SLC: 60 minutes.
  • DL2995: SLC 2026-12-19 11:15:00 → SEA 2026-12-19 12:36:00.

Travelers: prices on this page are totals for 1 adult. For a different party, open this trip for 2 adults · 3 adults · 4 adults · 2 adults + 1 child · 2 adults + 2 children; each link opens AI flight search for these dates and those travelers, and the customer link to share comes from those results.

Explore this route

• All dates for this route
• Dec 18, 2026 · Return options
• Dec 20, 2026 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Philadelphia (PHL) to Seattle (SEA) · Dec 19, 2026 · one way: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
• Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
• Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
• If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Philadelphia to Seattle (SEA) flight deals · Flight search guide.
• Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.

Feedback (optional): Missing info · Axel issue