Seattle to San Francisco BFI, SEA → SFO
Boeing Field International Airport (BFI), Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO)
The cheapest return found recently is $205 with Alaska Airlines, 5 Nov – 11 Nov, found today. The cheapest one-way found recently is $114 with Alaska Airlines, 20 Nov, found 3 days ago.
Return
The cheapest return fare on each of 5 departure dates is usually $205 to $221.
Cheapest return found recently
$205
5 Nov – 11 Nov · Alaska Airlines
Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO)
Leaves 3:48 p.m. · Return leaves 3:05 p.m. · 20 h 53 min of travel, both ways together
out nonstop, back 1 stop
found today
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$205 5 Nov – 11 Novfound todaySee prices for these dates
$199 22 Nov – 23 Novfound 2 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $137 to $181.
At $205, the cheapest return found recently is above 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 return price?
Compared with the cheapest return fare on each of 5 departure dates from 4 Nov to 1 Dec, 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?
No. We hold 6-night return fares on 1 other departure date within 3 days of 5 Nov, and it is not cheaper.
Every date we hold
7 fares on 5 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 4 Nov – 11 Nov | $232 | Frontier Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 5 Nov – 11 Nov | $205 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | out nonstop, back 1 stop | found today | See prices for these dates |
| 22 Nov – 23 Nov | $199 | Frontier Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 23 Nov – 23 Nov | $221 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | out nonstop, back 1 stop | found 2 days ago | See prices for these dates |
| 1 Dec – 2 Dec | $217 | Southwest Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | out 1 stop, back nonstop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $199.
Airlines on the cheapest dates: Frontier Airlines, Alaska Airlines, Southwest Airlines.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $91 to $110.
Cheapest one-way found recently
$114
20 Nov · Alaska Airlines
Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO)
Leaves 7:38 a.m. · 2 h 16 min trip
nonstop
found 3 days ago
Cheapest nonstop one-way
$114
20 Nov · Alaska Airlines
Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO)
Leaves 7:38 a.m. · 2 h 16 min trip
nonstop
found 3 days ago
Found recently, and the cheapest we hold
$114 20 Novfound 3 days agoOpen this trip
$75 4 Novfound 5 days agoOpen this trip
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $53 to $103.
At $114, the cheapest one-way found recently is above 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 4 Nov to 20 Nov, 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 20 Nov to compare.
Every date we hold
8 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 4 Nov | $75 | Frontier Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | 1 stop | found 5 days ago | Open this trip |
| 10 Nov | $106 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | nonstop | found 4 days ago | Open this trip |
| 20 Nov | $114 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → San Francisco International Airport (SFO) | nonstop | found 3 days ago | Open this trip |
Airlines on the cheapest dates: Alaska Airlines, Frontier Airlines.
Premium cabin fares from Seattle to San Francisco
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 5 Nov – 11 Nov in another cabin: Premium economy · Business · First
Today's prices for 20 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Seattle to San Francisco?
Return
Fares 30 to 59 days before departure were typically 63% lower than 0 to 6 days before departure.
From the cheapest return 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 |
|---|---|---|---|---|
| 0–6 days | $412 | $301 | +170% | 10 |
| 7–13 days | $270 | $216 | +77% | 10 |
| 14–29 days | $208 | $154 | +36% | 19 |
| 30–59 days | $153 | $150 | Cheapest seen | 14 |
| 90–179 days | $155 | $137 | +2% | 11 |
One-way
Fares 30 to 59 days before departure were typically 51% lower than 0 to 6 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 |
|---|---|---|---|---|
| 0–6 days | $158 | $141 | +105% | 9 |
| 7–13 days | $158 | $103 | +105% | 17 |
| 14–29 days | $102 | $64 | +33% | 22 |
| 30–59 days | $77 | $53 | Cheapest seen | 24 |
| 90–179 days | $110 | $100 | +43% | 20 |
| 180+ days | $905 | $161 | +1075% | 11 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Seattle → Sacramento
121 km from San Francisco
$219
$14 more than flying to San Francisco
24 Dec – 1 Jan 2027 · SEA → SMF · out nonstop, back nonstop
found 3 days ago
Everett → San Francisco
34 km from Seattle
$228
$23 more than flying from Seattle
22 Nov – 23 Nov · PAE → SFO · out nonstop, back nonstop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Seattle → San Jose
67 km from San Francisco
$124
$10 more than flying to San Francisco
4 Nov · SEA → SJC · 1 stop
found 3 days ago
Seattle → Sacramento
121 km from San Francisco
$124
$10 more than flying to San Francisco
28 Oct · SEA → SMF · nonstop
found 2 days ago
Seattle → Oakland
13 km from San Francisco
$167
$53 more than flying to San Francisco
16 Jun 2027 · SEA → OAK · nonstop
found 5 days ago
Everett → San Francisco
34 km from Seattle
$179
$65 more than flying from Seattle
13 Nov · PAE → SFO · nonstop
found 2 days ago
Bellingham → San Francisco
128 km from Seattle
$300
$186 more than flying from Seattle
27 Oct · BLI → SFO · 1 stop
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 return found recently is for 5 Nov – 11 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