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ONTOntario·Ontario International·Ontario, United States
How long is your layover?
30 min45 min1 hr1¼ hr1½ hr2 hr2½ hr3 hr4 hr
Recommended minimum45 minutes
Quick Stats
Concourses
2
Terminal 2, Terminal 4
Max Transit
15m
via walking
Avg. Security
10m
~5m with PreCheck
Primary Hub
—
Minimum Connection Times
Domestic → Domestic
40min
Domestic → International
65min
International → Domestic
65min
International → International
75min
Ontario skylinePhoto by Stephen Leonardi on Pexels
AD PLACEMENT — CONTEXTUAL
Getting Between Concourses
Terminal 2 and Terminal 4 sit a few hundred yards apart and are connected by an outdoor walkway as well as a periodic shuttle bus that circles the terminal loop road. Passengers connecting between the two terminals must exit security, walk or ride the shuttle, and re-clear TSA screening, since there is no sterile connector between the buildings.
Busyness — Connection Risk
12a6a12p6p12a
Low risk
Moderate
High risk
Key Facts
Two-terminal layout with no connecting train
Low overall congestion
Limited true international service (mostly Mexico via Volaris)
No major airline hub presence
Common Questions
Is 30 minutes enough for a layover at ONT?

Below the 40-minute domestic MCT, this leaves no margin for a gate change or line at security. See full 30 min guide →

Is 45 minutes enough for a layover at ONT?

Comfortable for a same-terminal domestic connection with light security lines. See full 45 min guide →

Is 1 hour enough for a layover at ONT?

Meets the international MCT threshold with a reasonable cushion for the FIS process on Mexico flights. See full 1 hr guide →

Is 1 hour 15 min enough for a layover at ONT?

Ample time for any combination of terminal change, security, and immigration processing. See full 1¼ hr guide →

Is 1½ hours enough for a layover at ONT?

Well above any MCT here, leaving room for minor delays without stress. See full 1½ hr guide →

Is 2 hours enough for a layover at ONT?

Generous buffer that comfortably covers any transfer scenario at this small airport. See full 2 hr guide →

Is 2½ hours enough for a layover at ONT?

Far exceeds requirements; consider grabbing food since ONT has limited post-security dining. See full 2½ hr guide →

Is 3 hours enough for a layover at ONT?

Excessive for ONT's compact layout, though fine if flight schedules dictate the gap. See full 3 hr guide →

Is 4 hours enough for a layover at ONT?

Far more time than needed given ONT's small size and low congestion. See full 4 hr guide →

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AD PLACEMENT — BEFORE FOOTER