San Francisco to Seattle SFO → SEA
San Francisco International Airport (SFO) → Seattle-Tacoma International Airport (SEA)
The cheapest one-way found recently is $69 with Frontier Airlines, 18 Nov, found yesterday.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $121 to $672.
Cheapest one-way found recently
$69
18 Nov · Frontier Airlines
San Francisco International Airport (SFO) → Seattle-Tacoma International Airport (SEA)
Leaves 9:27 p.m. · 21 h 6 min trip
1 stop
found yesterday
Cheapest nonstop one-way
$173
20 May 2027 · Alaska Airlines
San Francisco International Airport (SFO) → Seattle-Tacoma International Airport (SEA)
Leaves 8:00 a.m. · 2 h 9 min trip
nonstop
found 2 days ago
Found recently, and the cheapest we hold
$69 18 Novfound yesterdayOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $69 to $173.
At $69, the cheapest one-way found recently is at the low end of that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 18 Nov to 24 Sept 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 18 Nov to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 18 Nov | $69 | Frontier Airlines | San Francisco International Airport (SFO) → Seattle-Tacoma International Airport (SEA) | 1 stop | found yesterday | Open this trip |
| 20 May 2027 | $173 | Alaska Airlines | San Francisco International Airport (SFO) → Seattle-Tacoma International Airport (SEA) | nonstop | found 2 days ago | Open this trip |
| 24 Sept 2027 | $1,170 | EVA Air | San Francisco International Airport (SFO) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 2 days ago | Open this trip |
Which month looks cheapest?
November 2026 is the cheapest month — from $69.
Airlines on the cheapest dates: Frontier Airlines, Alaska Airlines, EVA Air.
Premium cabin fares from San Francisco to Seattle
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 18 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Francisco to Seattle?
One-way
Fares 30 to 59 days before departure were typically 21% lower than 14 to 29 days before departure.
From the cheapest one-way each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 14–29 days | $100 | $69 | +27% | 20 |
| 30–59 days | $79 | $69 | Cheapest seen | 9 |
| 90–179 days | $103 | $69 | +30% | 18 |
| 180+ days | $161 | $90 | +104% | 16 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Oakland → Seattle
13 km from San Francisco
$218
24 Feb 2027 – 27 Feb 2027 · OAK → SEA · out nonstop, back nonstop
found 2 days ago
Sacramento → Seattle
121 km from San Francisco
$356
17 Jul 2027 – 25 Jul 2027 · SMF → SEA · out nonstop, back 1 stop
found 3 days ago
San Jose → Seattle
67 km from San Francisco
$237
30 Oct – 1 Nov · SJC → SEA · out nonstop, back 1 stop
found 4 days ago
Stockton → Seattle
104 km from San Francisco
$701
23 Oct – 24 Oct · SCK → SEA · out 1 stop, back 2 stops
found 5 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Oakland → Seattle
13 km from San Francisco
$107
$38 more than flying from San Francisco
18 Nov · OAK → SEA · nonstop
found yesterday
San Jose → Seattle
67 km from San Francisco
$132
$63 more than flying from San Francisco
17 Nov · SJC → SEA · nonstop
found yesterday
Sacramento → Seattle
121 km from San Francisco
$169
$100 more than flying from San Francisco
2 Nov · SMF → SEA · 1 stop
found yesterday
Stockton → Seattle
104 km from San Francisco
$217
$148 more than flying from San Francisco
25 Oct · SCK → SEA · 1 stop
found 4 days ago
Santa Rosa → Seattle
78 km from San Francisco
$229
$160 more than flying from San Francisco
11 Mar 2027 · STS → SEA · nonstop
found 2 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest one-way found recently is for 18 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work