Route on-time record
SAN to BOS: most on-time flights and the best time to fly
San Diego (San Diego International Airport) to Boston (Boston Logan International Airport). 1,787 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was JetBlue 2120 at 8:59 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAN → BOS
San Diego to Boston: 1,787 nonstop flights a year
On time (12 months)
78%
Cancelled
1.5%
avg delay 20 min
Best time to leave
3 to 6 PM
84% on time vs 72% before 9 AM
Most reliable airline
JetBlue
78% chance on time
Lowest nonstop fare seen in the next two months: $256 (Alaska 255 on 2026-11-20). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · JetBlue 2120
8:59 PM → 5:21 AM5h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.8%
- Avg arrival delay
- 17 min
- Arrived on time 86% of the time (361 flights, Jun 2025 to May 2026).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
Strong track record · 361 flights
Find JetBlue 2120 fares Opens this date on Aviasales#2 · Delta 571
9:49 PM → 6:30 AM5h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 21 min
- Arrived on time 82% of the time (154 flights, Jun 2025 to May 2026).
- Never cancelled in 155 scheduled flights.
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
Moderate track record · 154 flights
Find Delta 571 fares Opens this date on Aviasales#3 · JetBlue 620
3:15 PM → 11:58 PM5h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 76%
- Cancelled
- 1.5%
- Avg arrival delay
- 23 min
- Arrived on time 76% of the time (260 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (3 to 6 PM: 84% on time; Before 9 AM: 72%).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
Strong track record · 260 flights
Find JetBlue 620 fares Opens this date on Aviasales#4 · Alaska 255
8:54 PM → 5:44 AM5h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 84% of the time (19 flights, Jun 2025 to May 2026).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
Limited track record · 19 flights
Find Alaska 255 fares Opens this date on Aviasales#5 · JetBlue 220
1:41 PM → 10:23 PM5h 42m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 75%
- Cancelled
- 1.4%
- Avg arrival delay
- 23 min
- Arrived on time 75% of the time (141 flights, Jun 2025 to May 2026).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 166 ground stops and delay programs started).
Moderate track record · 141 flights
Find JetBlue 220 fares Opens this date on Aviasales#6 · JetBlue 920
11:05 AM → 7:44 PM5h 38m nonstop
Local times, typical schedule. Last flown 2026-05-20.
72%
chance on time
- On time (history)
- 73%
- Cancelled
- 2.1%
- Avg arrival delay
- 22 min
- Arrived on time 73% of the time (139 flights, Jun 2025 to May 2026).
- Departs inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.
Moderate track record · 139 flights
Find JetBlue 920 fares Opens this date on Aviasales#7 · Alaska 390
8:00 AM → 4:40 PM5h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
71%
chance on time
- On time (history)
- 72%
- Cancelled
- 1.4%
- Avg arrival delay
- 22 min
- Arrived on time 72% of the time (345 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Before 9 AM: 72% on time; 3 to 6 PM: 84%).
- Departs inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
Strong track record · 345 flights
Find Alaska 390 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- JetBlue78%
915 flights · 79% on time as flown · 1.3% cancel
- Delta Air Lines78%
364 flights · 79% on time as flown · 1.6% cancel
- Alaska Airlines74%
508 flights · 75% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM72%
244 flights · avg delay 21 min
- 9 AM to noon73%
374 flights · avg delay 21 min
- Noon to 3 PM73%
192 flights · avg delay 25 min
- 3 to 6 PM84%
99 flights · avg delay 28 min
- 6 to 9 PM80%
254 flights · avg delay 25 min
- After 9 PM83%
624 flights · avg delay 13 min
Best day: Saturday (79%). Worst: Sunday (72%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume34%
- Late-arriving aircraft30%
- Airline (crew, maintenance, boarding)26%
- Severe weather9%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SAN to BOS questions
- What time of day is best to fly SAN to BOS?
- 3 to 6 PM: 84% of flights arrived on time, against 72% for departures before 9 AM.
- Which airline is most on time from SAN to BOS?
- JetBlue, with a season-adjusted 78% chance of operating and arriving on time over 915 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SAN to BOS?
- December (68% on time); the best was May (84%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SAN
- BOS to SAN (return)
- SAN to SFO 68%
- SAN to LAS 76%
- SAN to DEN 79%
- SAN to PHX 76%
- SAN to SMF 77%
- SAN to SJC 78%
- SAN to SEA 81%
- SAN to ORD 78%
- SAN to DFW 77%
- SAN to OAK 75%
- SAN to SLC 84%
- SAN to AUS 74%
Most on-time flights from SAN on every route →
Live status: FAA delays and ground stops