Seattle to San Francisco (SFO): September 2026 flight deals

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Round-trip fare examples

Observed September 16, 2026 (UTC). Search a trip for current prices and flight details.

Round-trip totals in USD for 1 adult · Economy.

DestinationTrip datesDaysAxel MemberAirline fareStopsSearch
San Francisco (SFO)Sep 21–23, 20262$381$4281 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 24–27, 20263$387$4301 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 25–27, 20262$387$4301 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 25–28, 20263$348$3881 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 28–30, 20262$350$3921 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 30–Oct 1, 20261$318$3541 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 30–Oct 2, 20262$318$3541 stopSearch for 1 adult · Dates · Travelers
San Francisco (SFO)Sep 30–Oct 5, 20265$230$2561 stopSearch for 1 adult · Dates · Travelers

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USD for the listed travelers.

1 adult · Round-trip starting totals · 2–4 days

Starting totals are for the round trip. Choose a return flight to confirm the final total.

Trip / travelersDatesFlightsAxel MemberAirline fareNext step
SEA–SFO · 1 adultSep 21–24, 2026 · 3 daysOut: Frontier Airlines · 1 stop (LAS) · 10h 29mRound-trip starting total: $387Round-trip starting total: $430 — return selection pending · Observed September 20, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 21–24, 2026 · 3 daysOut: United Airlines · Nonstop · 2h 13mRound-trip starting total: $674Round-trip starting total: $757 — return selection pending · Observed September 20, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 24–27, 2026 · 3 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47mRound-trip starting total: $378Round-trip starting total: $422 — return selection pending · Observed September 20, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 24–27, 2026 · 3 daysOut: Alaska Airlines · Nonstop · 2h 15mRound-trip starting total: $614Round-trip starting total: $685 — return selection pending · Observed September 20, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 24–28, 2026 · 4 daysOut: Alaska Airlines · Nonstop · 2h 15mRound-trip starting total: $528Round-trip starting total: $593 — return selection pending · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 25–28, 2026 · 3 daysOut: Alaska Airlines · Nonstop · 2h 15mRound-trip starting total: $528Round-trip starting total: $593 — return selection pending · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 25–27, 2026 · 2 daysOut: Alaska Airlines · Nonstop · 2h 15mRound-trip starting total: $528Round-trip starting total: $593 — return selection pending · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 27–30, 2026 · 3 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47mRound-trip starting total: $370Round-trip starting total: $414 — return selection pending · Observed September 20, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 27–30, 2026 · 3 daysOut: Alaska Airlines · Nonstop · 2h 15mRound-trip starting total: $528Round-trip starting total: $593 — return selection pending · Observed September 20, 2026Search for 1 adult · Change dates · Travelers / cabin

1 adult · Complete round-trip totals · 2–4 days

Complete round-trip totals; both flights included.

Trip / travelersDatesFlightsAxel MemberAirline fareNext step
SEA–SFO · 1 adultSep 24–28, 2026 · 4 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAS) · 7h 11m$370$414 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 25–28, 2026 · 3 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAS) · 11h 18m$348$388 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 25–28, 2026 · 3 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAX) · 6h 29m$465$517 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 25–27, 2026 · 2 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAS) · 11h 18m$387$430 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 25–27, 2026 · 2 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAX) · 6h 29m$545$606 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 28–30, 2026 · 2 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAS) · 14h 31m$350$392 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin
SEA–SFO · 1 adultSep 28–30, 2026 · 2 daysOut: Frontier Airlines · 1 stop (DEN) · 7h 47m; Return: Frontier Airlines · 1 stop (LAX) · 9h 10m$465$517 — round-trip total · Observed September 17, 2026Search for 1 adult · Change dates · Travelers / cabin

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