Baltimore to San Francisco BWI → SFO
Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO)
The cheapest return found recently is $430 with Frontier Airlines, 22 Dec – 29 Dec, found yesterday.
Return
The cheapest return fare on each of 5 departure dates is usually $320 to $430.
Cheapest return found recently
$430
22 Dec – 29 Dec · Frontier Airlines
Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO)
Leaves 10:16 a.m. · Return leaves 6:00 p.m. · 26 h 53 min of travel, both ways together
out 1 stop, back 2 stops
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$430 22 Dec – 29 Decfound yesterdaySee prices for these dates
$264 9 Nov – 18 Novfound 4 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 $205 to $350.
At $430, 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 9 Nov to 1 Mar 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 7-night return fares leaving within 3 days of 22 Dec to compare.
Every date we hold
7 fares on 5 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 9 Nov – 18 Nov | $264 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 10 Nov – 19 Nov | $320 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 13 Nov – 22 Nov | $332 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO) | out 2 stops, back 1 stop | found 4 days ago | See prices for these dates |
| 22 Dec – 29 Dec | $430 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO) | out 1 stop, back 2 stops | found yesterday | See prices for these dates |
| 1 Mar 2027 – 6 Mar 2027 | $444 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → San Francisco International Airport (SFO) | out nonstop, back 1 stop | found 5 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $264.
Airlines on the cheapest dates: Frontier Airlines, Southwest Airlines.
Premium cabin fares from Baltimore 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 22 Dec – 29 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Baltimore to San Francisco?
Return
Fares 7 to 13 days before departure were typically 45% 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 | $534 | $292 | +80% | 16 |
| 7–13 days | $296 | $292 | Cheapest seen | 10 |
| 14–29 days | $350 | $264 | +18% | 12 |
| 30–59 days | $351 | $205 | +18% | 16 |
| 60–89 days | $430 | $392 | +45% | 13 |
| 90–179 days | $444 | $299 | +50% | 23 |
| 180+ days | $505 | $442 | +71% | 10 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Philadelphia → San Francisco
145 km from Baltimore
$396
$34 less than flying from Baltimore
11 Dec – 16 Dec · PHL → SFO · out 1 stop, back 1 stop
found yesterday
Washington → San Francisco
57 km from Baltimore
$399
$31 less than flying from Baltimore
22 Dec – 29 Dec · DCA → SFO · out 1 stop, back 1 stop
found yesterday
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Philadelphia → San Francisco
145 km from Baltimore
$172
16 Mar 2027 · PHL → SFO · stops unknown
found yesterday
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.
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