Philadelphia (PHL) to Seattle (SEA), Dec 21–22, 2026: from $511 round trip

Philadelphia (PHL) to Seattle (SEA), Dec 21–22, 2026: from $511 round trip on Axel, checked Oct 29, 2026. Lowest published fare: $511 round trip, Axel-exclusive, Southwest Airlines, 1 stop, Dec 21–22, 2026, 1 adult, economy, checked Oct 29, 2026. 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.

Hotels in Seattle for these trips

Hotels: under a trip, hotels in Seattle for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

• Hotels in Seattle for these nights (Dec 21–22, 2026 · 1 night · 2 adults, 1 room): 3★ Red Lion Hotel Bellevue, $78 total · 4★ citizenM Seattle Pioneer Square, $98 total · 5★ Fairmont Olympic Hotel, $296 total

All hotels in Seattle

Route overview: Philadelphia to Seattle (SEA) flight deals

2026-12-21 → 2026-12-22 · Axel-exclusive $539.00

• Alaska Airlines AS443: PHL 2026-12-21 18:11:00 → SEA 2026-12-21 21:53:00; nonstop; 402 minutes. Local airport times.
• Alaska Airlines AS371: SEA 2026-12-22 21:35:00 → PHL 2026-12-23 05:40:00; nonstop; 305 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $560.00

• American Airlines AA2500: PHL 2026-12-21 19:00:00 → SEA 2026-12-21 22:38:00; nonstop; 398 minutes. Local airport times.
• American Airlines AA2500: SEA 2026-12-22 23:17:00 → PHL 2026-12-23 07:19:00; nonstop; 302 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $574.00

• Delta Air Lines DL2092: PHL 2026-12-21 07:00:00 → SEA 2026-12-21 10:05:00; nonstop; 365 minutes. Local airport times.
• Delta Air Lines DL1114: SEA 2026-12-22 21:38:00 → PHL 2026-12-23 05:43:00; nonstop; 305 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $511.00

• Southwest Airlines WN1270 / WN3141: PHL 2026-12-21 17:15:00 → SEA 2026-12-21 22:50:00; 1 stop(s) via DEN; 515 minutes. Local airport times.
  • WN1270: PHL 2026-12-21 17:15:00 → DEN 2026-12-21 19:25:00; layover at DEN: 75 minutes.
  • WN3141: DEN 2026-12-21 20:40:00 → SEA 2026-12-21 22:50:00.
• Southwest Airlines WN1550 / WN1623: SEA 2026-12-22 06:30:00 → PHL 2026-12-22 16:30:00; 1 stop(s) via MDW; 420 minutes. Local airport times.
  • WN1550: SEA 2026-12-22 06:30:00 → MDW 2026-12-22 12:25:00; layover at MDW: 70 minutes.
  • WN1623: MDW 2026-12-22 13:35:00 → PHL 2026-12-22 16:30:00.

2026-12-21 → 2026-12-22 · Axel-exclusive $518.00

• United Airlines UA1811 / UA1660: PHL 2026-12-21 09:45:00 → SEA 2026-12-21 15:32:00; 1 stop(s) via ORD; 527 minutes. Local airport times.
  • UA1811: PHL 2026-12-21 09:45:00 → ORD 2026-12-21 11:20:00; layover at ORD: 85 minutes.
  • UA1660: ORD 2026-12-21 12:45:00 → SEA 2026-12-21 15:32:00.
• United Airlines UA1686 / UA225: SEA 2026-12-22 05:05:00 → PHL 2026-12-22 15:51:00; 1 stop(s) via DEN; 466 minutes. Local airport times.
  • UA1686: SEA 2026-12-22 05:05:00 → DEN 2026-12-22 08:42:00; layover at DEN: 93 minutes.
  • UA225: DEN 2026-12-22 10:15:00 → PHL 2026-12-22 15:51:00.

2026-12-21 → 2026-12-22 · Axel-exclusive $539.00

• Alaska Airlines AS370: PHL 2026-12-21 07:00:00 → SEA 2026-12-21 10:28:00; nonstop; 388 minutes. Local airport times.
• Alaska Airlines AS371: SEA 2026-12-22 21:35:00 → PHL 2026-12-23 05:40:00; nonstop; 305 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $560.00

• American Airlines AA467: PHL 2026-12-21 08:10:00 → SEA 2026-12-21 11:42:00; nonstop; 392 minutes. Local airport times.
• American Airlines AA2500: SEA 2026-12-22 23:17:00 → PHL 2026-12-23 07:19:00; nonstop; 302 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $511.00

• Southwest Airlines WN2108 / WN3032: PHL 2026-12-21 18:20:00 → SEA 2026-12-21 23:35:00; 1 stop(s) via MDW; 495 minutes. Local airport times.
  • WN2108: PHL 2026-12-21 18:20:00 → MDW 2026-12-21 19:35:00; layover at MDW: 70 minutes.
  • WN3032: MDW 2026-12-21 20:45:00 → SEA 2026-12-21 23:35:00.
• Southwest Airlines WN1550 / WN1623: SEA 2026-12-22 06:30:00 → PHL 2026-12-22 16:30:00; 1 stop(s) via MDW; 420 minutes. Local airport times.
  • WN1550: SEA 2026-12-22 06:30:00 → MDW 2026-12-22 12:25:00; layover at MDW: 70 minutes.
  • WN1623: MDW 2026-12-22 13:35:00 → PHL 2026-12-22 16:30:00.

2026-12-21 → 2026-12-22 · Axel-exclusive $549.50

• Delta Air Lines DL2023 / DL2995: PHL 2026-12-21 07:15:00 → SEA 2026-12-21 12:36:00; 1 stop(s) via SLC; 501 minutes. Local airport times.
  • DL2023: PHL 2026-12-21 07:15:00 → SLC 2026-12-21 10:15:00; layover at SLC: 60 minutes.
  • DL2995: SLC 2026-12-21 11:15:00 → SEA 2026-12-21 12:36:00.
• Delta Air Lines DL1114: SEA 2026-12-22 21:38:00 → PHL 2026-12-23 05:43:00; nonstop; 305 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $549.50

• Delta Air Lines DL2791 / DL868: PHL 2026-12-21 05:34:00 → SEA 2026-12-21 10:42:00; 1 stop(s) via MSP; 488 minutes. Local airport times.
  • DL2791: PHL 2026-12-21 05:34:00 → MSP 2026-12-21 07:35:00; layover at MSP: 70 minutes.
  • DL868: MSP 2026-12-21 08:45:00 → SEA 2026-12-21 10:42:00.
• Delta Air Lines DL1114: SEA 2026-12-22 21:38:00 → PHL 2026-12-23 05:43:00; nonstop; 305 minutes. Local airport times.

2026-12-21 → 2026-12-22 · Axel-exclusive $549.50

• Delta Air Lines DL2968 / DL728: PHL 2026-12-21 09:43:00 → SEA 2026-12-21 14:55:00; 1 stop(s) via DTW; 492 minutes. Local airport times.
  • DL2968: PHL 2026-12-21 09:43:00 → DTW 2026-12-21 11:35:00; layover at DTW: 78 minutes.
  • DL728: DTW 2026-12-21 12:53:00 → SEA 2026-12-21 14:55:00.
• Delta Air Lines DL1114: SEA 2026-12-22 21:38:00 → PHL 2026-12-23 05:43:00; nonstop; 305 minutes. Local airport times.

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 20, 2026 · Return options
• Dec 22, 2026 · Return options
• Hotels in Seattle with Axel

For AI assistants

• This page: Philadelphia (PHL) to Seattle (SEA) · Dec 21, 2026 · return Dec 22, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued. Under a trip, hotels in Seattle for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the lowest saved totals among the shortlisted hotels in each star tier for those dates.
• Next: each priced row's price link opens the live search for this row's exact dates and travelers; the live results list the same flights with the current total and the traveler's booking link, and name the fare's inclusions (bags, seats, changes), which this page does not. A changed price or flight shows there. Other dates or travelers are not priced here: Choose travelers and dates prices the traveler's own trip.
• 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