Cheap flights from San Francisco to Philadelphia from $439 SFO → PHL
San Francisco International Airport (SFO) → Philadelphia International Airport (PHL)
The cheapest return found recently is $439 with Frontier Airlines, 22 Dec – 29 Dec, found 2 days ago.
- Cheapest return found recently
- $439, 22 Dec to 29 Dec
- Usual return price
- $399 to $506
- Cheapest month to fly
- December 2026, return fares from $359 found in the last 7 days
Return
The cheapest return fare on each of 3 departure dates is usually $399 to $506.
Cheapest return found recently
$439
22 Dec – 29 Dec · Frontier Airlines
San Francisco International Airport (SFO) → Philadelphia International Airport (PHL)
Leaves 12:53 a.m. · Return leaves 7:52 p.m. · 22 h 45 min of travel, both ways together
out 1 stop, back 1 stop
found 2 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$439 22 Dec – 29 Decfound 2 days agoSee prices for these dates
$359 28 Dec – 11 Jan 2027found 4 days agoSee prices for these dates
What have prices looked like?
Over 43 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $234 to $535.
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 3 departure dates from 21 Nov to 28 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?
We hold no other 7-night return fares leaving within 3 days of 22 Dec to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 21 Nov – 23 Nov | $572 | Southwest Airlines | San Francisco International Airport (SFO) → Philadelphia International Airport (PHL) | out 2 stops, back 1 stop | found 5 days ago | See prices for these dates |
| 22 Dec – 29 Dec | $439 | Frontier Airlines | San Francisco International Airport (SFO) → Philadelphia International Airport (PHL) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 28 Dec – 11 Jan 2027 | $359 | Frontier Airlines | San Francisco International Airport (SFO) → Philadelphia International Airport (PHL) | out 1 stop, back 3 stops | found 4 days ago | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $359.
Airlines on the cheapest dates: Frontier Airlines, Southwest Airlines.
Premium cabin fares from San Francisco to Philadelphia
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 22 Dec – 29 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Francisco to Philadelphia?
Return
Fares 30 to 59 days before departure were typically 37% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (43 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 | $490 | $394 | +59% | 18 |
| 7–13 days | $412 | $411 | +33% | 11 |
| 14–29 days | $350 | $234 | +13% | 11 |
| 30–59 days | $309 | $307 | Cheapest seen | 12 |
| 60–89 days | $359 | $359 | +16% | 12 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
San Francisco → New York
130 km from Philadelphia
$284
$155 less than flying to Philadelphia
19 Jan 2027 – 26 Jan 2027 · SFO → JFK · out nonstop, back nonstop
found yesterday
Oakland → Philadelphia
13 km from San Francisco
$530
$91 more than flying from San Francisco
22 Dec – 29 Dec · OAK → PHL · out 1 stop, back 2 stops
found 2 days ago
San Jose → Philadelphia
67 km from San Francisco
$534
$95 more than flying from San Francisco
22 Dec – 29 Dec · SJC → PHL · out 1 stop, back 2 stops
found 2 days ago
San Francisco → Baltimore
145 km from Philadelphia
$749
$310 more than flying to Philadelphia
13 Nov – 18 Nov · SFO → BWI · out nonstop, back nonstop
found 7 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
San Francisco → New York
130 km from Philadelphia
$139
16 Jan 2027 · SFO → JFK · nonstop
found 2 days ago
San Francisco → Baltimore
145 km from Philadelphia
$327
6 Oct 2027 · SFO → BWI · nonstop
found 5 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 22 Dec – 29 Dec. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from San Francisco to Philadelphia?
The cheapest return found recently is $439 with Frontier Airlines, 22 Dec to 29 Dec, found 2 days ago. The cheapest return we hold, of any age, is $359 with Frontier Airlines, 28 Dec to 11 Jan 2027, found 4 days ago. The cheapest return fare on each of 3 departure dates is usually $399 to $506.
What is the cheapest month to fly from San Francisco to Philadelphia?
December 2026 is the cheapest month for a return, from $359, 28 Dec to 11 Jan 2027, found 4 days ago.
How far ahead should I book a flight from San Francisco to Philadelphia?
In 43 days of prices between 24 Sept and 11 Nov, return fares 30 to 59 days before departure were typically 37% lower than 0 to 6 days before departure.
Which airlines have the cheapest flights from San Francisco to Philadelphia?
Between 21 Nov and 28 Dec, Frontier Airlines has the cheapest return on 2 of the 3 departure dates we hold, and Southwest Airlines on 1.
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