Nogales sits at the southern tip of I-19, right on the international line, and it is one of the longest straight-down-the-map trips you can take out of Phoenix without leaving Arizona: about 178 miles each way, or roughly three hours behind the wheel. People make the run for the produce industry, for shopping on both sides of the line, for winter-visitor season in the Santa Cruz County towns along the way, and for connections onward from the southern end of the freeway system.
The route: I-10 east, then I-19 south
There is exactly one sensible road. Leave the Valley on I-10 east past Chandler and Casa Grande, cross the desert through Picacho Peak country and Marana, skirt Tucson, and pick up I-19 south at the interchange on the south side of the metro. From there it is a straight shot: Green Valley and Sahuarita first, then Tubac and Rio Rico, then Nogales at the end of the pavement. Tucson is the natural break point at a little under two hours out of Phoenix, and the Green Valley rest stops and fuel stations are the last easy services before the final stretch.
I-19 itself is a curiosity worth knowing about. It is one of the only highways in the country still signed in kilometers rather than miles, a leftover from a 1980s metric experiment that was never converted back. The exit numbers and distance signs read in kilometers, so do not be surprised when the numbers feel wrong against your odometer. Speed limits are posted in miles per hour as usual, which is the one place the metric theme stops.
Tucson as the midpoint
Phoenix to Tucson runs about 110 to 115 miles depending on your starting point in the Valley, usually an hour and three-quarters to two hours in normal traffic. Tucson to Nogales is roughly another 65 to 70 miles, a little over an hour on I-19. That split matters for planning because the two halves behave differently: the I-10 half is the one exposed to Valley rush hour and Tucson rush hour, while the I-19 half is steadier but has fewer alternate routes if something closes. Leave Phoenix outside the morning and evening peaks and the whole trip stays close to three hours; leave at five in the afternoon and the first half alone can eat that.
The ports of entry at the south end
Nogales has three ways across the line, and they serve different traffic. The Mariposa facility on the west side handles commercial trucks plus passenger vehicles and is the main vehicle route. The DeConcini facility downtown handles passenger vehicles and pedestrians in the middle of the twin downtowns. The Morley Gate a short distance away is for pedestrians only. Wait times swing widely by hour, day of the week and season, with southbound usually lighter than northbound and holiday weekends the heaviest of all, so check the posted wait times before you leave Tucson rather than discovering them at the fence.
A practical note that catches first-timers: keep your documents on your person, not in the trunk or the checked bag. You will need an accepted document to come back through to the Arizona side, and the pedestrian gates move much faster than the vehicle lanes at peak times. That is why so many day visitors park on the Arizona side and walk: the downtown day lots cluster near the DeConcini and Morley gates, the walk itself is minutes, and you skip the vehicle queue entirely on the return.
Parking and the walk-across option
If your business is on foot, driving all the way to the fence still makes sense because downtown Nogales, Arizona has paid day parking within easy walking distance of the pedestrian gates. Lock the car, take only what you need for the day, and keep the parking receipt with you. If your trip involves cargo, samples or anything you cannot carry, stay in the vehicle lanes at Mariposa or DeConcini and budget extra time for inspection on the way back. Either way, fuel up before the final approach: stations thin out in the last few miles and the return queue can idle longer than you expect.
Winter-visitor season changes the math
From late fall through early spring the whole I-19 corridor fills with seasonal residents bound for Green Valley, Tubac and the Rio Rico area, and Friday and Sunday traffic on the corridor gets noticeably heavier. Lodging in Nogales and Tubac books out on festival and rodeo weekends, and the vehicle lanes run longer. Traveling midweek, leaving early in the morning, and booking any overnight stay ahead are the three moves that keep a winter trip smooth.
Getting to Nogales without driving it yourself
A three-hour drive after a flight into Sky Harbor is a lot, which is why the I-10 and I-19 corridor is one of the runs where door-to-door service earns its keep: pickup at the terminal, one vehicle the whole way, no parking to hunt at the south end. The Phoenix airport shuttle page covers departures from the airport side, the Green Valley airport shuttle guide page covers the Green Valley and Sahuarita midpoint towns, and the Phoenix to Bisbee shuttle guide page covers the Cochise County neighbor to the east for travelers combining both corners of the southeast. If your trip starts with a flight rather than a car, coordinate the pickup time against your actual landing time plus baggage claim, not against the scheduled arrival alone.
Frequently asked questions
How far is Nogales from Phoenix?
About 178 miles via I-10 east and I-19 south, usually around three hours of driving outside rush hour.
How far is Nogales from Tucson?
Roughly 65 to 70 miles south on I-19, a little over an hour.
Why are the I-19 signs in kilometers?
I-19 was part of a metric-signing experiment and was never converted back, so exits and distances read in kilometers while speed limits stay in miles per hour.
Can I walk across and back in Nogales?
Yes. Pedestrian gates downtown serve foot traffic both ways, many visitors park on the Arizona side and walk, and you should carry an accepted document for the return.
