Boise (BOI) to Seattle (SEA), Dec 19, 2026: from $150 one way

Boise (BOI) to Seattle (SEA), Dec 19, 2026: from $150 one way on Axel, checked Oct 29, 2026. Lowest published fare: $150 one way, Axel-exclusive, Alaska Airlines, nonstop, Dec 19, 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.

Route overview: Boise to Seattle (SEA) flight deals

2026-12-19 · one way · Axel-exclusive $149.50

• Alaska Airlines AS445: BOI 2026-12-19 16:59:00 → SEA 2026-12-19 17:42:00; nonstop; 103 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $162.50

• Delta Air Lines DL4127: BOI 2026-12-19 14:10:00 → SEA 2026-12-19 15:00:00; nonstop; 110 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $175.50

• Southwest Airlines WN784 / WN4889: BOI 2026-12-19 18:40:00 → SEA 2026-12-19 22:20:00; 1 stop(s) via SMF; 280 minutes. Local airport times.
  • WN784: BOI 2026-12-19 18:40:00 → SMF 2026-12-19 19:10:00; layover at SMF: 65 minutes.
  • WN4889: SMF 2026-12-19 20:15:00 → SEA 2026-12-19 22:20:00.

2026-12-19 · one way · Axel-exclusive $149.50

• Alaska Airlines AS485: BOI 2026-12-19 06:31:00 → SEA 2026-12-19 07:20:00; nonstop; 109 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $162.50

• Delta Air Lines DL3775: BOI 2026-12-19 06:15:00 → SEA 2026-12-19 07:14:00; nonstop; 119 minutes. Local airport times.

2026-12-19 · one way · Axel-exclusive $201.50

• Alaska Airlines AS2498 / AS423: BOI 2026-12-19 13:00:00 → SEA 2026-12-19 17:53:00; 1 stop(s) via GEG; 353 minutes. Local airport times.
  • AS2498: BOI 2026-12-19 13:00:00 → GEG 2026-12-19 13:10:00; layover at GEG: 207 minutes.
  • AS423: GEG 2026-12-19 16:37:00 → SEA 2026-12-19 17:53:00.

2026-12-19 · one way · Axel-exclusive $201.50

• Alaska Airlines AS3015 / AS2240: BOI 2026-12-19 13:13:00 → SEA 2026-12-19 18:45:00; 1 stop(s) via PDX; 392 minutes. Local airport times.
  • AS3015: BOI 2026-12-19 13:13:00 → PDX 2026-12-19 13:48:00; layover at PDX: 237 minutes.
  • AS2240: PDX 2026-12-19 17:45:00 → SEA 2026-12-19 18:45:00.

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
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For AI assistants

• This page: Boise (BOI) 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.
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• 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.

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