As of 2026, Terminal 1 at San Diego International Airport (SAN) primarily serves as the operational hub for Southwest Airlines, along with several ultra-low-cost and domestic carriers including Spirit Airlines, Frontier Airlines, JetBlue, Allegiant Air, and Sun Country Airlines. This terminal is currently transitioning through a massive modernization project, with the first phase of the New T1 now fully operational, offering expanded gate capacity and updated passenger amenities compared to the legacy structure.
San Diego International Airport has long been one of the busiest single-runway commercial airports in the world. For decades, Terminal 1 was known for its cramped quarters and 1960s-era design. However, the landscape in 2026 is vastly different. Following the opening of the first 19 gates of the New T1, the passenger experience has been revolutionized. Navigating this terminal requires an understanding of which airlines have remained, which have shifted, and how the new infrastructure affects check-in and boarding processes.
The 2026 Transformation: The New T1 and Airline Alignment
The year 2026 marks a pivotal era for San Diego International Airport. The "New T1" project, a multi-billion dollar overhaul, has reached a critical milestone. The old Terminal 1, which served travelers since 1967, has largely been bypassed by the Phase 1 opening. This new facility was designed to handle the increased volume of the airport's primary tenant, Southwest Airlines, while providing a more efficient environment for smaller domestic carriers.
The alignment of airlines in Terminal 1 is strategic. By grouping the largest domestic carrier (Southwest) with several low-cost carriers (LCCs) and ultra-low-cost carriers (ULCCs), the airport authority has streamlined the security and baggage handling processes for a specific segment of the traveling public. Unlike Terminal 2, which handles all international arrivals and the major legacy carriers like Delta, United, and American, Terminal 1 is the heartbeat of domestic, point-to-point travel in and out of San Diego.
Southwest Airlines: The Anchor of Terminal 1
Southwest Airlines remains the dominant force in Terminal 1, accounting for the vast majority of its daily flights. In 2026, Southwest utilizes the lion's share of the new gates. For passengers, this means that almost the entire eastern wing of the new concourse is dedicated to Southwest operations.
The airline’s presence in San Diego is critical for California corridor flights (to San Jose, Sacramento, and Oakland) as well as major mid-continent hubs like Phoenix, Denver, and Las Vegas. With the improved gate management systems in the New T1, Southwest has been able to reduce "on-tarmac" wait times, which were a frequent complaint in the old terminal configuration.
Ultra-Low-Cost Carriers (ULCCs) and Domestic Partners
While Southwest is the anchor, Terminal 1 is also the home for several other key airlines:
- Spirit Airlines: Known for its "Fit Fare" model, Spirit operates several high-frequency routes from Terminal 1. In 2026, Spirit has expanded its footprint in San Diego, taking advantage of the increased gate efficiency to offer more late-night and early-morning departures.
- Frontier Airlines: Frontier continues to provide budget-friendly options, primarily connecting San Diego to its hubs in Denver and various seasonal destinations.
- JetBlue: Although JetBlue has a smaller presence than Southwest, it remains a vital link for transcontinental travel to the East Coast, particularly Boston and New York (JFK).
- Allegiant Air and Sun Country: These carriers offer more specialized, often seasonal service. Their operations in Terminal 1 are streamlined, utilizing shared check-in kiosks that are a hallmark of the new terminal’s flexible design.
Terminal 1 Facilities and Passenger Experience in 2026
The transition to the New T1 in 2026 has introduced a level of technical sophistication previously unseen at SAN. The terminal now features a "Luminous Wave" design, which allows for massive amounts of natural light, reducing the claustrophobic feel of the original building.
Check-in and Bag Drop Technicalities
In the 2026 configuration, the check-in hall is designed with a "touchless-first" philosophy. Most airlines in Terminal 1, led by Southwest, have moved toward automated bag drop systems. Passengers use biometric-enabled kiosks to print tags and drop luggage onto a conveyor system that uses advanced imaging to sort bags with 99.9% accuracy.
For those flying with Spirit or Frontier, it is important to note that these carriers strictly enforce digital boarding passes. While there are staffed counters, they are primarily reserved for complex ticketing issues or oversized baggage. The physical layout of the New T1 check-in area is wider, allowing for queues that do not spill out into the sidewalks, a major improvement over the old terminal.
Security Screening (TSA)
Security in Terminal 1 has been consolidated into a massive, high-throughput checkpoint. By 2026, all lanes are equipped with Computed Tomography (CT) scanners, meaning passengers no longer need to remove electronics or liquids from their bags. This has significantly increased the "pass-through" rate per hour, though peak Southwest departure windows (6:00 AM – 8:30 AM) still see heavy volume.
Gate Areas and Seating
One of the most significant upgrades in 2026 is the "power-at-every-seat" initiative. Every gate in the New T1 concourse features integrated USB-C and standard AC outlets. The seating is arranged in "clusters" rather than traditional rows, allowing families to sit together more easily. This layout was specifically designed to accommodate the high-turnover nature of Southwest’s boarding process, providing more standing room near the gate entry points for the "A, B, C" boarding groups.
Comparative Overview of Terminal 1 Airlines
To help travelers quickly identify their requirements, the following table outlines the current 2026 status for carriers operating out of Terminal 1.
| Airline | Primary Destinations | Check-in Location | TSA PreCheck Available | Technology Notes |
|---|---|---|---|---|
| Southwest | California, West, Midwest | East Hall | Yes | Full self-tagging bag drop |
| Spirit | Las Vegas, Dallas, Chicago | West Hall | Yes | Biometric bag drop available |
| Frontier | Denver, Las Vegas, Phoenix | West Hall | Yes | Digital-only kiosks |
| JetBlue | New York, Boston | West Hall | Yes | High-speed Wi-Fi lounge access |
| Allegiant | Bellingham, El Paso, Provo | West Hall | Yes | Limited counter hours |
| Sun Country | Minneapolis/St. Paul | West Hall | Yes | Seasonal self-service |
Ground Transportation and Accessibility for Terminal 1
Accessing Terminal 1 in 2026 has been simplified by the completion of the New T1 Parking Plaza. This five-story structure is located directly across from the terminal and includes nearly 3,000 parking spaces.
The T1 Parking Plaza
The parking plaza utilizes a smart-parking system. Digital signage at the entrance and at the end of each row indicates exactly how many spaces are available. Furthermore, the plaza is equipped with over 100 Electric Vehicle (EV) charging stations, reflecting San Diego's commitment to sustainability. For passengers flying Southwest or JetBlue, the pedestrian bridges on the second and fourth levels provide direct access to the check-in hall, bypassing the ground-level traffic.
Public Transit and Shuttles
The San Diego Flyer, a free electric shuttle, continues to connect Terminal 1 to the Old Town Transit Center. This is the primary link for passengers using the MTS Trolley or the North County Coaster.
For those using ride-share services like Uber or Lyft, the 2026 "App-Based Ride Share" zone for Terminal 1 is located in a dedicated area within the Parking Plaza. This move was made to eliminate the congestion on the terminal arrivals curb, which is now strictly reserved for immediate passenger pick-up from private vehicles.
Dining and Retail: The "San Diego Sense of Place"
The 2026 Terminal 1 experience is not just about logistics; it is also about the local culture. The San Diego County Regional Airport Authority has curated a dining and retail program that emphasizes local brands over generic national chains.
- Local Flavors: Passengers in the New T1 can find outlets of famous San Diego eateries such as Puesto, Hodad’s, and several local craft breweries. This provides a "last taste of San Diego" for departing travelers.
- Retail: The shops in Terminal 1 focus on "travel essentials" but also include boutiques featuring local artisans. The layout is designed as a "streetscape," encouraging passengers to walk the length of the concourse.
- Sustainability: All vendors in Terminal 1 are required to follow strict environmental guidelines, including the prohibition of single-use plastic straws and a requirement for compostable packaging.
Navigating Construction and Terminal Transfers
While the first phase of the New T1 is open in 2026, travelers should be aware that the airport is still a work in progress. Phase 2, which involves the demolition of the remaining old sections and the addition of 11 more gates, is ongoing.
Moving Between Terminal 1 and Terminal 2
If you are arriving on an international flight in Terminal 2 (such as British Airways or Lufthansa) and connecting to a Southwest flight in Terminal 1, you must exit the secure area, take the terminal shuttle (or walk the outdoor pedestrian path), and re-clear security at Terminal 1. There is currently no "airside" (post-security) walkway between the two terminals. This walk takes approximately 10 to 15 minutes.
Common Pitfalls to Avoid
- Terminal Confusion: Always check your boarding pass. Alaska Airlines and Delta are frequently mistaken for T1 carriers, but they are located in Terminal 2.
- Arrival Times: Despite the increased efficiency of the New T1, the sheer volume of Southwest passengers means that Monday mornings and Friday afternoons are exceptionally busy. Arriving 2 hours before a domestic flight is still the recommended standard.
- Parking Pre-booking: The New T1 Parking Plaza is popular. In 2026, it is highly recommended to pre-book parking through the official SAN website to guarantee a spot and receive a discounted rate.
Frequently Asked Questions
Which airlines moved from Terminal 1 to Terminal 2 recently?
As of 2026, most major relocations have stabilized. However, over the past few years, Alaska Airlines moved its entire operation to Terminal 2 to take advantage of the larger gate infrastructure there. United and American Airlines also remain firmly in Terminal 2. Terminal 1 is now almost exclusively the domain of Southwest and the LCC/ULCC group.
Is there a lounge in Terminal 1?
In the legacy Terminal 1, there were no airline lounges. In the 2026 New T1, plans for a common-use lounge (accessible via Priority Pass or a day pass) are in the final stages of completion. However, Southwest does not traditionally operate "clubs" or lounges, so the majority of Terminal 1 is focused on high-quality public seating and "den" areas.
How do I get to the Rental Car Center from Terminal 1?
The Rental Car Center is located on the north side of the airfield. In 2026, you must take the dedicated "Rental Car Shuttle" from the transportation islands located outside the Terminal 1 baggage claim. These shuttles run 24/7, approximately every 5–10 minutes.
Can I walk from Terminal 1 to the T1 Parking Plaza?
Yes. One of the best features of the 2026 layout is the direct pedestrian access. You no longer have to cross multiple lanes of dangerous traffic. There are covered skywalks with moving walkways that take you from the terminal directly into the parking structure.
Does Southwest have a curbside check-in at Terminal 1?
Yes, Southwest continues to offer curbside check-in for passengers with domestic flights. This is often the fastest way to drop bags if you have already checked in on your mobile device. In 2026, this area is located at the far east end of the Terminal 1 departures level.
Next Steps for Travelers
Before heading to San Diego International Airport, download the mobile app for your specific airline. Because Terminal 1 is in a state of evolution in 2026, gate assignments can shift. Ensure you have enrolled in TSA PreCheck or CLEAR to navigate the concentrated security lines in the new terminal more effectively. If you are driving, check the real-time parking availability on the SAN official website to decide between the T1 Parking Plaza and the more economical Long-Term lots.
