Flight number record

DL 702

Delta Air Lines · Salt Lake City to Boston

Route: SLC → BOS
Departs: 17:15
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 702, check with Delta Air Lines.

DL 702 lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 6 minutes early.

On time

77.2%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

10.0%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 10.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 126 of 364 flights, with 17:30 (84 flights) and 17:48 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:15126 flights34.6%
Departs 17:3084 flights23.1%
Departs 17:4841 flights11.3%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 68.2%, and DL 702 runs 9 points better at 77.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 702 next to SLC to BOS

Every carrier on SLC to BOS combined arrived on time 82.2% of the time across 1,256 flights, so DL 702 is 5 points behind it. Delta flew 1,083 flights on the same city pair under all its flight numbers, including this one, and those ran 83.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 4 points.

DL 702 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 702thin sample	364	77.2%	75 min	1.10%	B
All Delta Air Lines on SLC–BOS	1,083	83.3%	60 min	1.29%	B
All carriers on SLC–BOS	1,256	82.2%	61 min	1.75%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 2025 at 69.6%, a swing of 15 points on roughly 91 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 202592 flights69.6%
Oct–Dec 202591 flights76.9%
Jan–Mar 202690 flights77.9%
Apr–Jun 202691 flights84.4%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 702 did best on Saturday at 94.2% on time and worst on Sunday at 70.0%. Each day rests on about 52 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

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 6,128 reported delay minutes.

Late-arriving aircraft
40%
Carrier
34%
National Airspace System
23%
Extreme weather
3%

40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 6,128 reported delay minutes here, that single category outweighs weather by 15 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 6,128 delay minutes reported on DL 702.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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, DL 702 is one of the weaker ways to fly SLC to BOS: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures