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Is a 45 min layover in Ontario long enough?

ONT · Ontario International · Ontario, United States
Probably Enough

Yes, 45 minutes is probably enough for a layover at ONT (Ontario).

Comfortable for a same-terminal domestic connection with light security lines.
Quick Stats
Concourses
2
Max Transit
15m
Avg. Security
10m
Primary Hub
—
Minimum Connection Times
Domestic → Domestic
40min
tight
Domestic → International
65min
✗
International → Domestic
65min
✗
International → International
75min
✗
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Tips for 45 min Connections
Allow extra time if your connection requires moving between Terminal 2 and Terminal 4, since you must re-clear security.
Volaris flights to Mexico use a small federal inspection facility, so international connections should not be cut close.
Security lines are usually short outside of early morning and early evening banks, making quick connections feasible within a single terminal.
Check which terminal each of your flights uses in advance, as airline assignments split fairly evenly between the two buildings.
There is no landside train, so budget walking time or wait for the shuttle rather than assuming instant transfer.
Busyness — Connection Risk
12a6a12p6p12a
Low risk
Moderate
High risk
Tight connections are safer outside peak hours. Morning rush (6–9a), midday (11a–2p), and evening (4–8p) are highest risk.
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.
Frequently Asked Questions
Is 45 minutes enough for a layover at Ontario International (ONT)?

Comfortable for a same-terminal domestic connection with light security lines.

What is the minimum connection time at ONT?

Minimum connection times at Ontario International: Domestic-to-Domestic is 40 minutes, International-to-International is 75 minutes. These are the shortest layovers airlines will sell.

Can I make a 45 minutes connection at ONT on an international flight?

45 minutes is below the 75-minute international MCT at Ontario International. You may need to rush and could miss your connection. 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.

What happens if I miss my connection at ONT?

If you miss a connection, head to your airline's ticket counter in the departing terminal, as ONT's small size means gate agents can often rebook quickly, though same-day options may be limited given lower flight frequency.

Other Layover Durations at ONT
25 min30 min35 min40 min50 min55 min1 hr1¼ hr1½ hr1¾ hr2 hr2½ hr3 hr4 hr
45 min Layovers at Other Airports
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