Baltimore to Boston BWI → BOS
Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS)
The cheapest return found recently is $335 with Southwest Airlines, 30 Dec – 2 Jan 2027, found yesterday. The cheapest one-way found recently is $172 with Frontier Airlines, 1 Nov, found 2 days ago.
Return
The cheapest return fare on each of 7 departure dates is usually $280 to $409.
Cheapest return found recently
$335
30 Dec – 2 Jan 2027 · Southwest Airlines
Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS)
Leaves 8:10 a.m. · Return leaves 1:08 p.m. · 3 h 15 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Cheapest nonstop return
$335
30 Dec – 2 Jan 2027 · Southwest Airlines
Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS)
Leaves 8:10 a.m. · Return leaves 1:08 p.m. · 3 h 15 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Found recently, and the cheapest we hold
$335 30 Dec – 2 Jan 2027found yesterdaySee prices for these dates
$217 24 Nov – 28 Novfound 6 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 $146 to $239.
At $335, 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 7 departure dates from 20 Oct to 21 Jan 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 3-night return fares leaving within 3 days of 30 Dec to compare.
Every date we hold
10 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Oct – 20 Oct | $483 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out 1 stop, back nonstop | found 2 days ago | See prices for these dates |
| 21 Oct – 22 Oct | $319 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out 1 stop, back nonstop | found 2 days ago | See prices for these dates |
| 22 Oct – 23 Oct | $523 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 24 Nov – 28 Nov | $217 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 25 Nov – 28 Nov | $312 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 30 Dec – 2 Jan 2027 | $335 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 21 Jan 2027 – 31 Jan 2027 | $247 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $217.
Airlines on the cheapest dates: Southwest Airlines, Frontier Airlines.
One-way
The cheapest one-way fare on each of 4 departure dates is usually $55 to $146.
Cheapest one-way found recently
$172
1 Nov · Frontier Airlines
Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS)
Leaves 5:40 a.m. · 6 h 4 min trip
1 stop
found 2 days ago
Cheapest nonstop one-way
$52
24 Nov · Southwest Airlines
Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS)
Leaves 6:35 a.m. · 1 h 30 min trip
nonstop
found 6 days ago
Found recently, and the cheapest we hold
$172 1 Novfound 2 days agoOpen this trip
$52 24 Novfound 6 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 $52 to $63.
At $172, 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 4 departure dates from 1 Nov to 25 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 1 Nov to compare.
Every date we hold
4 fares on 4 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 1 Nov | $172 | Frontier Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | 1 stop | found 2 days ago | Open this trip |
| 16 Nov | $56 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | nonstop | found 6 days ago | Open this trip |
| 24 Nov | $52 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | nonstop | found 6 days ago | Open this trip |
| 25 Nov | $137 | Southwest Airlines | Baltimore/Wash International Thurgood Marshall Airport (BWI) → Logan International Airport (BOS) | nonstop | found 6 days ago | Open this trip |
Airlines on the cheapest dates: Southwest Airlines, Frontier Airlines.
Premium cabin fares from Baltimore to Boston
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 30 Dec – 2 Jan 2027 in another cabin: Premium economy · Business · First
Today's prices for 1 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Baltimore to Boston?
Return
Fares 14 to 29 days before departure were typically 73% 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 | $540 | $319 | +270% | 9 |
| 7–13 days | $239 | $239 | +64% | 8 |
| 14–29 days | $146 | $146 | Cheapest seen | 13 |
| 30–59 days | $155 | $146 | +6% | 23 |
One-way
Timing didn't matter much here — prices were about the same in every range.
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 | $63 | $56 | +2% | 12 |
| 30–59 days | $64 | $52 | +3% | 14 |
| 60–89 days | $62 | $62 | Cheapest seen | 24 |
| 90–179 days | $63 | $63 | +2% | 9 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Philadelphia → Boston
145 km from Baltimore
$285
$50 less than flying from Baltimore
21 Nov – 24 Nov · PHL → BOS · out 1 stop, back nonstop
found yesterday
Washington → Boston
57 km from Baltimore
$312
$23 less than flying from Baltimore
30 Dec – 2 Jan 2027 · DCA → BOS · out nonstop, back nonstop
found yesterday
Harrisburg → Boston
105 km from Baltimore
$454
$119 more than flying from Baltimore
24 Nov – 29 Nov · MDT → BOS · out nonstop, back nonstop
found 6 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Washington → Boston
57 km from Baltimore
$101
$71 less than flying from Baltimore
19 Nov · DCA → BOS · 1 stop
found 2 days ago
Philadelphia → Boston
145 km from Baltimore
$165
$7 less than flying from Baltimore
26 Oct · PHL → BOS · stops unknown
found 3 days ago
Lancaster → Boston
88 km from Baltimore
$396
$224 more than flying from Baltimore
24 Oct · LNS → BOS · 1 stop
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 30 Dec – 2 Jan 2027. 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