Which airline is most reliable for ATL (Atlanta) to SJU (San Juan)?

The most reliable airline on the ATL to SJU route is Delta Air Lines, with an on-time arrival rate of 80%.

How often are flights delayed from ATL to SJU?

About 25% of flights from ATL to SJU experience delays. 75% arrive on time.

What's the average delay on ATL to SJU flights?

When flights from ATL to SJU are delayed, the average delay is approximately 62 minutes.

Is a short connection safe after a ATL to SJU flight?

With 75% of ATL to SJU flights arriving on time and an average delay of 62 minutes when late, a connection under 60 minutes at SJU is risky. We recommend at least 75-90 minutes for domestic connections after this route.

ATL → SJU

ATL (Atlanta) to SJU (San Juan)

ATL (Atlanta) to SJU (San Juan) flights arrive on time 75% of the time. The most reliable airline on this route is Delta Air Lines at 80%. The average delay is 62 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Source: Bureau of Transportation Statistics. Updated October 2026.

ATL → SJU on-time performance by month

JanFebMarAprMayJunJulAugSepOctNovDec

Worse

Better

This route is on time most of the time. About 75% of flights arrive on schedule.

Delays on this route are most often caused by the airline (crew, maintenance, or boarding).

Accurate?

Delta Air Lines is significantly more reliable on this route at 80% on time vs Frontier Airlines at 56%.

Airline Comparison

Delta Air Lines leads at 80% on time; Frontier Airlines trails at 56%.

Accurate?

Good to know

Departing from ATL

81% on time

Expect ~17 min sitting on the taxiway after your gate pushes back. ATL has long runway queues.

TSA is currently ~10 min. Best time: 4 AM (about 5 min).

More about ATL →

Arriving at SJU

75% on time

When flights into SJU are late, the average delay is 76 minutes. Build buffer if you have ground plans.

If connecting at SJU: TSA is ~15 min right now. Allow at least 60 minutes for a domestic connection.

More about SJU →Connection times at SJU →

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ATL Airport SJU Airport

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Data last updated October 2026. Source: Bureau of Transportation Statistics.