What is the difference between schedule_interval and timetable in Airflow?

schedule_interval (deprecated from Airflow 2.4) accepted cron strings or timedelta objects to define how frequently a DAG should run. schedule (the replacement) accepts the same values but also supports Timetables.

A Timetable is a plugin interface that gives full control over how data intervals and run times are calculated. This supports use cases like business-day schedules or irregular intervals that can't be expressed with cron alone.

from airflow.timetables.interval import CronDataIntervalTimetable

with DAG(
    'example',
    timetable=CronDataIntervalTimetable('0 9 * * MON-FRI', timezone='UTC'),
    ...
) as dag:
    ...

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