London to Bostonflight delays & reliability
Every LHR → BOS flight, ranked from real departure telemetry: 50 operations across 8 scheduled flights and 5 airlines. Updated August 13, 2026.
- ON-TIME
- 14%
- MEDIAN DELAY
- 36 min
- CANCELLED
- 5 of 50
- DISTANCE
- 5,240 km
- IF DISRUPTED
- €600 / pax
THE READ
Delta Air Lines at 09:40 (DL59) has run the cleanest recently — median 19 min departure delay across 7 operations. Avoid BA203 at 17:35 if timing matters — it's been running 66 min behind. Note: BA213 cancelled 3 of its last 7.
Every LHR → BOS flight, ranked
By median departure delay over each flight's recent operations. Green is bookable; red needs a story.
| # | FLIGHT | DEPARTS | MEDIAN DELAY | ON-TIME | 30+ MIN LATE | CANCELLED |
|---|---|---|---|---|---|---|
| 1 | Delta Air Lines DL59BEST BET | 09:40 | 19 min | 29% | 14% | 0 |
| 2 | JetBlue B61621 | 08:40 | 23 min | 40% | 40% | 2 |
| 3 | Virgin Atlantic VS157 | 16:05 | 25 min | 0% | 29% | 0 |
| 4 | American AA109 | 10:05 | 28 min | 29% | 43% | 0 |
| 5 | Virgin Atlantic VS11 | 18:55 | 30 min | 17% | 50% | 0 |
| 6 | British BA213 | 14:30 | 46 min | 0% | 75% | 3 |
| 7 | British BA239 | 20:10 | 50 min | 0% | 100% | 0 |
| 8 | British BA203AVOID IF TIMING MATTERS | 17:35 | 66 min | 0% | 71% | 0 |
Sample: each flight's last 7 scheduled days (50 operations total). Recent form, not a lifetime average.
The route's last 0 days
Average departure delay across all LHR → BOS flights, by day.
Airline vs airline on this route
Delta Air LinesLEADS
19 min median
1 flight · 7 operations · 29% on-time
JetBlue
23 min median
1 flight · 5 operations · 40% on-time · 2 cancelled
Virgin Atlantic
27 min median
2 flights · 13 operations · 8% on-time
American
28 min median
1 flight · 7 operations · 29% on-time
British
55 min median
3 flights · 18 operations · 0% on-time · 3 cancelled
Best time of day to fly it
Delays cascade through each aircraft's day — morning departures have been this route's safest window (32% on-time). For a client with a connection, book early.
When LHR → BOS goes wrong, your client is owed money
EC261 (EU RULES)
€600
per passenger · route over 3,500 km
UK261 (UK RULES)
£520
per passenger · same booking, per person
A FAMILY OF FOUR
4×
compensation is per passenger, not per booking
Qualifying events: arrival delays of 3+ hours, cancellations without proper notice, and denied boarding — when the cause is within the airline's control. Claims reach back years (up to six in England & Wales). Most go unclaimed because nobody is watching. MyAirAdvocate watches every booking a travel agent forwards and prepares the claim automatically — evidence included.
THIS PAGE IS A SNAPSHOT — ROUTE IQ IS LIVE
Inside the portal, agents run this analysis on any route, on demand — with each flight's day-by-day pattern, per-day weather attribution, and every airline's turnaround discipline at LHR (tight turnarounds are how one late arrival cascades all day).
Agents ask
Which London to Boston flight is the most reliable right now?
Delta Air Lines DL59 (the 09:40 departure) has run the cleanest — median 19 minutes of departure delay and 29% on-time across its last 7 operations, with no cancellations.
Which flight from LHR to BOS is delayed most often?
British BA203 (17:35) has been the route's weakest recent performer, running a median 66 minutes behind schedule.
What is the best time of day to fly London to Boston?
Morning departures have performed best recently — a median 23 minutes of delay and 32% on-time across 19 operations. Delays compound through the day as late aircraft cascade, so earlier is usually safer for connections.
How much compensation for a delayed or cancelled LHR–BOS flight?
The LHR–BOS corridor is about 5,240 km (over 3,500 km), so qualifying disruptions pay €600 per passenger under EC261 or £520 under UK261 — per passenger, so a family of four is owed four times that. Delays must reach 3+ hours at arrival; cancellations and denied boarding have their own rules; airline-controlled causes only.
Who is more reliable on this route?
On recent form, Delta Air Lines leads: median 19 min delay and 29% on-time across 7 operations, vs British at median 55 min and 0% on-time.
Can my client claim for a past LHR–BOS disruption?
Often yes — limitation periods reach back years (up to six in England & Wales, five in France, three in Germany). If a client's LHR–BOS flight was delayed 3+ hours or cancelled in recent years, the claim may still be live. MyAirAdvocate checks past bookings automatically when agents forward old confirmations.
Methodology: grades weigh on-time percentage (55%) and median departure delay (45%) across all tracked flights, ops-weighted; cancellations are heavily penalized. Source: departure-board telemetry — the same evidence MyAirAdvocate cites in EC261/UK261 claim letters. Short windows are honest but noisy; grades update as new operations land.