Frontier’s UpFront Plus seats offer a guaranteed empty middle seat for extra comfort.
Frontier’s Zone 1 boarding is available with a carry-on bag or special fare bundle.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $147 (Kiwi.com) |
One-way from | $106 (Delta) |
Popular in | July |
Cheapest in | February |
Average price | $282 |
Good round-trip deal | $164 or less |
Good one-way deal | $156 or less |
Fly from
Fly to
Route
Depart
Return
Price
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Wed 2/25
6:00 am-2:38 pm
1 stop9h 38m
Boston Logan Intl
Tue 3/3
3:18 pm-8:24 pm
Nonstop4h 06m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Wed 12/17
2:20 pm-5:48 pm
Nonstop4h 28m
Boston Logan Intl
Mon 1/12
8:05 am-1:11 pm
Nonstop4h 06m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Wed 3/4
6:15 am-4:15 pm
1 stop11h 00m
Boston Logan Intl
Tue 3/10
1:55 pm-10:18 pm
1 stop8h 23m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Wed 2/25
7:30 am-2:15 pm
1 stop7h 45m
Boston Logan Intl
Thu 3/5
5:29 am-2:00 pm
1 stop7h 31m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Tue 12/23
8:10 am-4:49 pm
1 stop9h 39m
Boston Logan Intl
Sun 1/4
8:00 pm-1:05 am
Nonstop4h 05m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Thu 12/25
3:45 am-1:48 pm
1 stop11h 03m
Boston Logan Intl
Wed 12/31
7:45 am-5:30 pm
1 stop8h 45m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Wed 3/25
1:30 am-5:39 am
Nonstop4h 09m
Boston Logan Intl
Sun 3/29
7:20 pm-11:23 pm
Nonstop4h 03m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Fri 1/30
2:25 pm-5:45 pm
Nonstop4h 20m
Boston Logan Intl
Sat 2/7
8:05 am-1:11 pm
Nonstop4h 06m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Sat 5/16
1:30 pm-5:53 pm
Nonstop4h 23m
Boston Logan Intl
Tue 5/19
8:20 am-12:28 pm
Nonstop4h 08m
San JuanBoston
SJU - BOS
SJUBOS
San Juan Luis Munoz Marin Intl
Fri 2/13
7:00 am-3:15 pm
1 stop9h 15m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
Booking 66 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Juan Luis Munoz Marin Intl Airport to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, February is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Boston (average of $56). Flying from San Juan Luis Munoz Marin Intl Airport to Boston in October is currently the most expensive (average of $138). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
When flying from San Juan Luis Munoz Marin Intl Airport to Boston, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 19% versus a flight in the morning.
Travelers seeking maximum savings on their San Juan Luis Munoz Marin Intl Airport to Boston flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
About 17% of weekly flights between San Juan and Boston have experienced delays in the past year, with the average delay time being 159 minutes.
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Saturday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Delta have had the lowest number of delays on this route, with just 11% of flights being delayed.
Comfort
Crew
Overall
Food
Entertainment
Boarding
Reviews
Jim,Nov 2025
AVL - ATL
Comfort
Crew
Overall
Food
Entertainment
Boarding
Reviews
Jim,Nov 2025
AVL - ATL
Comfort
Crew
Overall
Food
Entertainment
Boarding
Reviews
Jim,Nov 2025
AVL - ATL
Comfort
Crew
Overall
Food
Entertainment
Boarding
Reviews
Jim,Nov 2025
AVL - ATL
Comfort
Crew
Overall
Food
Entertainment
Boarding
Reviews
Jim,Nov 2025
AVL - ATL
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$85 | Average$223 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$88 | Average$167 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$141 | Average$284 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$190 | Average$316 | FlexibilityNo cancel fee | On-time62% |