Connecting at Phoenix: Terminal 3, Terminal 4 and the Sky Train

Last checked 24 September 2026

Is a 45-minute layover enough in Phoenix?

We estimate about 14% of 45-minute connections at Phoenix (PHX) ended in a missed connection between September 2025 and August 2026. How we count a missed connection

Allow 88 minutes for a connection in the same terminal at Phoenix (PHX), or 117 minutes if you change terminal.

Based on U.S. Customs and Border Protection's hourly figures, passport control at Phoenix (PHX) averaged 9 minutes (U.S. citizens 6 minutes, non-U.S. citizens 17; September 2025 to August 2026). That figure leaves out collecting and re-checking bags and the security re-screen, which at large US hubs we estimate add about 30 to 45 minutes.

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Phoenix is simple most of the time and tricky some of the time. About three-quarters of passengers use Terminal 4, home to American and Southwest. Most connections never leave the terminal they started in. But if your flights are in different terminals, you'll leave security, ride the PHX Sky Train and go through screening again.

At a glance

• Same airline: you stay behind security, and your next flight is in the same terminal.
• Terminal 3 ↔ Terminal 4: leave security, take the free PHX Sky Train and go through TSA again. There's no way to change terminals airside.
• The Sky Train runs 24 hours. Daytime waits average about 3½–7 minutes; overnight they can be 15 minutes or more.
• Book your second screening: PHX Reserve lets connecting passengers book a free TSA time slot.

Who flies from where

• Terminal 4: American, Southwest, Aeroméxico, Air France, British Airways, China Airlines, Contour, STARLUX, Volaris and WestJet.
• Terminal 3: Alaska, Delta, United, JetBlue, Frontier, Allegiant, Breeze, Sun Country, Hawaiian, Air Canada, Porter, Advanced Air, Denver Air Connection and Southern Airways Express.

A codeshare partner can put your next flight in the other terminal, so check your boarding pass or the airline's app.

Changing between Terminals 3 and 4

The airport says it plainly: "There is no way for customers to transfer terminals without exiting security." The PHX Sky Train stations are before security. So a terminal change means:

1. Leave the secure area.
2. Get to the Sky Train. From Terminal 3, go up to Level 4. From Terminal 4, go to Level 3 and walk toward the centre of the terminal.
3. Ride to the other terminal. Trains run around the clock, every 3½–7 minutes on average during the day.
4. Go through TSA screening again.

GateCast treats a change between Terminals 3 and 4 as leaving security and clearing it again, and budgets time for the whole change: the walk out, the train and the second screening. That's why a Terminal 3-to-4 connection grades lower than a same-terminal one with the same time on the ticket. The grade doesn't know the time of day, so the longer overnight wait for the train isn't in it. Late at night, allow for that yourself.

PHX Reserve: book your second security check

If you have to be screened again, you can book a free PHX Reserve slot with its own lane. Slots run from 240 down to 60 minutes before your onward flight's departure time. It helps when your connection leaves you more than an hour. You can book up to six days ahead, and there's no account or membership.

Tips

• American to American and Southwest to Southwest stay in Terminal 4 and behind security.
• If you're changing terminals late at night, allow for a longer wait for the Sky Train.
• If your onward flight is at least an hour after you'll reach the checkpoint, book a PHX Reserve slot before you fly.

How we count a missed connection

The layover times and missed-connection percentages on this page are estimates from our model, built on US DOT records (September 2025 to August 2026), with no guarantee; never book shorter than your airline's minimum connection time.

A missed connection means the real delays and cancellations that day left less time than our estimate of how long the change takes; estimated from US DOT on-time records for September 2025 to August 2026, with no passenger data.

The 45-minute figure is the estimated share of connections at Phoenix (PHX) that ended in a missed connection. The time in the box is the shortest layover after which another 15 minutes lowers the estimated missed-connection rate by less than 1 percentage point, on a curve fitted so that it never rises. The 1 percentage point is a judgement constant that we set. Extra time helps less and less because cancellations and long delays cause missed connections at any gap. Each time is our model's point estimate of where the fitted missed-connection curve levels off, from past flights between September 2025 and August 2026. The curve is calculated at 5-minute steps and joined by straight lines. Giving the time to the minute does not make it more certain: when we re-ran the estimate on 200 resampled sets of days, 95% of the times at Phoenix (PHX) for staying in the same terminal fell between 84 and 91 minutes, and for changing terminal between 98 and 120 minutes. At Phoenix (PHX), the estimated missed-connection rate was 6.4% at 88 minutes if you stay in the same terminal, and 7.1% at 117 minutes if you change terminal (share of connections, September 2025 to August 2026). An estimated 1% of the 45-minute connections at Phoenix (PHX) were already shorter than our estimate of the change on the schedule. We don't give a figure for 30 minutes. A 30-minute connection is about as long as our own estimate of the change (typically 26 to 31 minutes at one terminal) and often shorter, so a percentage would mostly come from that estimate.

The passport-control figure is our average of U.S. Customs and Border Protection's hourly averages at Phoenix (PHX), weighted by passengers, for flights arriving between September 2025 and August 2026 (CBP Airport Wait Times, awt.cbp.gov, downloaded 22 October 2026). CBP says its wait times "do not include time to retrieve baggage or navigate through the airport." The 30 to 45 minutes for bags and the security re-screen is our rough estimate for large US hubs, based on airlines' stated savings of up to 25 minutes for bag transfer and up to 45 minutes for skipping the re-screen in their international-connection trials, and on traveller reports; actual times vary widely and we have no figure for Phoenix (PHX) alone.

Checked 24 September 2026; layover figures checked 23 October 2026; passport-control figures checked 22 October 2026. Terminals and airlines change, so confirm with your airline before you travel.

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