Does airplane mode turn off alarms? No — alarms still ring

No. Airplane mode does not turn off alarms on iPhone. Your Clock alarm rings at its normal volume with airplane mode on, because alarms live entirely on the phone — they don't need cellular, Wi-Fi, or any connection to fire.

Airplane mode only switches off the radios: cellular, Wi-Fi, and Bluetooth. The clock keeps running, timers keep counting, and alarms fire on schedule. Apple's alarm guide covers how Clock alarms work; nothing about them depends on a signal.

What airplane mode actually turns off

With airplane mode on, your iPhone disables:

• cellular (calls, texts, mobile data)
• Wi-Fi (it can be re-enabled manually)
• Bluetooth (also re-enablable manually)

What keeps working:

• Clock alarms and timers
• anything already on the phone — music, notes, downloaded content
• the clock itself

So sleeping with airplane mode on is safe for your alarm. Some people do it deliberately: no 2 a.m. calls, no notifications, no temptation to scroll. Do Not Disturb does the same job without cutting your connection, and it doesn't stop alarms either.

The travel catch: time zones

There is one honest gotcha, and it's about time, not sound.

With airplane mode on, your iPhone can't reach the network to update its time zone. If you fly from New York to London overnight with airplane mode on the whole way, the phone may still be on New York time when you land — and a 7:00 AM alarm fires at 7:00 AM on whatever clock the phone is currently showing.

If you're traveling across time zones:

1. Land, turn airplane mode off, and let the phone pick up local time.
2. Then check your alarms before you sleep.
3. For flights, set alarms after the time zone settles, not before.

Airplane mode plus silent mode: still rings

Stacking airplane mode with Silent Mode, Do Not Disturb, or a Focus doesn't change anything — the built-in Clock alarm rings through all of them at once. If your alarm stayed quiet with airplane mode on, the cause is elsewhere: work through why didn't my alarm go off or the silent alarm fixes.

The usual suspects are the Ringtone and Alerts volume, the alarm sound set to None, or a third-party alarm app that rings as a notification.

One caveat for alarm apps that need the internet

Because airplane mode kills connectivity, any alarm app that needs a server to trigger its alarm is a bad bet overnight. An alarm should fire from the phone itself, the way Clock does.

WakeUpBroo works that way — it uses AlarmKit, iOS's real alarm support, so the alarm rings offline, through silent, DND, and airplane mode. What makes it different is stopping it: there's no snooze and no dismiss button. You read a rotating code from wakeupbroo.com/code on another device — a laptop, a tablet — and by the time you've entered it, you're out of bed.

Bottom line

Airplane mode will not stop your alarm — set it and sleep. Just remember the time-zone catch when you travel, and if an alarm failed with airplane mode on, the cause was volume, sound settings, or a third-party app, not the airplane icon.

If the alarm rings fine and you still lose the morning, that's the heavy-sleeper problem — start with the best alarm apps for heavy sleepers.