Flight number record
DL 702
Delta Air Lines · Salt Lake City to Boston
- Route
- SLC → BOS
- Departs
- 17:15
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 702, check with Delta Air Lines.
DL 702 lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 364 flights, with a median arrival 6 minutes early.
Key figures
On time
76.3%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
9.8%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 9.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 702 flies
DL 702 flies SLC to BOS without a single fixed slot. Its most common scheduled departure was 17:15, used on 154 of 364 flights, with 17:30 (84 flights) and 17:25 (54 flights) next.
- Departs 17:15154 flights42.3%
- Departs 17:3084 flights23.1%
- Departs 17:2554 flights14.8%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 702 runs 8 points better at 76.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 702 next to SLC to BOS
Every carrier on SLC to BOS combined arrived on time 80.6% of the time across 1,264 flights, so DL 702 is 4 points behind it. Delta flew 1,083 flights on the same city pair under all its flight numbers, including this one, and those ran 82.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 702thin sample | 364 | 76.3% | 72 min | 1.10% | B |
| All Delta Air Lines on SLC–BOS | 1,083 | 82.7% | 59 min | 1.29% | B |
| All carriers on SLC–BOS | 1,264 | 80.6% | 62 min | 1.98% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 702 quarter by quarter
DL 702 did not run the same all year. Its best quarter was Apr–Jun 2026 at 84.4% on time and its weakest Jul–Sep 2026 at 59.0%, a swing of 25 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights80.0%
- Oct–Dec 202591 flights76.9%
- Jan–Mar 202690 flights77.9%
- Apr–Jun 202691 flights84.4%
- Jul–Sep 202662 flights59.0%
Scale runs 50% to 90%.
By weekday, DL 702 did best on Saturday at 92.3% on time and worst on Tuesday at 69.2%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 702 runs when it is late
DL 702 often beats the schedule: 112 of 358 completed flights, 31%, arrived 15 minutes or more early. The 85 late arrivals split 25 under half an hour, 25 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early112 flights31.3%
- Within 15 min161 flights45.0%
- 15–29 min late25 flights7.0%
- 30–59 min late25 flights7.0%
- 1–2 hours late16 flights4.5%
- 2+ hours late19 flights5.3%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
15 of 84 late departures made up the time and arrived on time, 18% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for DL 702
The latest arrival of the period was on 29 December 2025, 5 hours 33 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 December 2025 | 5 hours 33 minutes | Late-arriving aircraft |
| 13 July 2026 | 4 hours 13 minutes | Late-arriving aircraft |
| 18 April 2026 | 3 hours 27 minutes | Late-arriving aircraft |
| 9 December 2025 | 3 hours 17 minutes | Carrier |
| 12 April 2026 | 3 hours 15 minutes | Late-arriving aircraft |
Delay causes
Why DL 702 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,152 reported delay minutes.
- 40%Late-arriving aircraft
- 30%Carrier
- 26%National Airspace System
- 4%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,152 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 6,152 delay minutes reported on DL 702.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.55%.
Connections and routes
What a delay on this flight costs
9.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 2,105 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 364 flights under DL 702 in the data flew SLC to BOS. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 702
For a booking, read DL 702 as 76.3% on time with 1.10% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to BOS, every carrier and departure
- BOS to SLC, the return direction
- Delta Air Lines 657 on the same route81.2%
- Delta Air Lines 696 on the same route91.2%
- Salt Lake City International (SLC) delay statistics
- Boston Logan International (BOS) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.