If you are flying with Frontier Airlines from St. Louis Lambert International Airport (STL), knowing the terminal before you leave home can save time and confusion. Frontier operates from Terminal 1, using the C Concourse for its STL departures. The airport currently lists Frontier gates C19 and C23, while Frontier’s international-arrival information is handled through Terminal 2’s international arrivals area when applicable. This guide covers the Frontier Airlines STL Terminal, including check-in, gates, baggage, security, arrivals, departures, flight information, parking, transportation, and common passenger questions.
Frontier Airlines STL Terminal at a Glance
| Travel Information | Details |
| Airport | St. Louis Lambert International Airport |
| Airport Code | STL |
| Airline | Frontier Airlines |
| Frontier Airlines STL Terminal | Terminal 1 |
| Concourse | C Concourse |
| Frontier Gates | C19, C23 |
| Frontier Baggage Office | 314-391-2872 |
| Frontier Customer Service | 801-401-9000 |
| Airport Address | 10701 Lambert International Blvd., St. Louis, MO 63145 |
| Security for Frontier | Terminal 1 – C Gates checkpoint |
The airport’s current airline directory specifically places Frontier at Terminal 1, gates C19 and C23.
What Terminal Is Frontier Airlines at STL?
Frontier Airlines uses Terminal 1 at St. Louis Lambert International Airport. For regular Frontier departures, passengers should head toward the C Concourse.
This is important because STL has two terminal buildings. Terminal 1 handles Frontier along with airlines such as American, Alaska and United, while Terminal 2 is primarily associated with Southwest and international-arrival operations.
So, if you searched for frontier airlines terminal STL or frontier airlines STL terminal, the short answer is:
Frontier Airlines — Terminal 1, C Concourse at STL.
Always check your boarding pass and the airport’s flight-status information on the day of travel because gate assignments can change.
Frontier Airlines Check-In at STL
Frontier passengers should go to Terminal 1 for check-in and departure. The terminal map identifies Frontier’s ticketing position within Terminal 1, and the airport provides airline-specific information for passengers traveling with Frontier.
If you have already checked in online and are traveling with only a personal item that meets Frontier’s requirements, you may be able to proceed toward security without spending additional time at the ticket counter.
Passengers who need to check baggage should allow extra time for the bag-drop process.
Have these ready before you go to STL:
- Government-Issued ID
- Frontier board pass
- Reservation details
- Checked bag info (if applicable)
- Travel documents required
- More time for airport security
Frontier reserves the right to change its baggage policies and fees and passengers should check with the airline about their allowance and purchase options before traveling.
STL Frontier Airlines departure terminal
For a Frontier Airlines departure from STL go to Terminal 1 and follow signs for the C Gates.
After completing check-in and security, passengers proceed toward the C Concourse, where Frontier is currently listed at C19 and C23.
The airport’s C Gates security checkpoint serves Frontier passengers and currently operates from 3:30 a.m. to 10:00 p.m., although TSA operating hours can change.
Simple departure route
Terminal 1 → Frontier check-in → C Gates TSA checkpoint → C Concourse → Frontier gate
That is the basic route most Frontier departing passengers will follow at STL.
Frontier Airlines Arrivals at STL
Frontier arrivals at STL are associated with Terminal 1 and the C Concourse for the airline’s regular operations. The airport identifies the C Concourse as the meeting/exit area for arriving passengers from Alaska, American, Frontier and Southern Airways Express.
After landing, follow airport signs toward:
Arrivals → Baggage Claim → Ground Transportation
If you are meeting someone arriving on Frontier, STL specifically identifies the exit from the C Concourse as one of its passenger meeting locations.
Frontier Airlines STL Baggage Information
Baggage is one of the most common reasons passengers search for the frontier airlines lambert st louis terminal before traveling.
At STL, the airport lists a dedicated Frontier baggage office phone number: 314-391-2872.
For baggage questions involving:
- Missing baggage
- Damaged baggage
- Delayed baggage
- Checked-bag fees
- Carry-on requirements
- Personal-item rules
contact Frontier or its baggage service team.
Keep your baggage receipt and flight information until you have collected your luggage.
Frontier Airlines Flights From STL
Frontier operates flights from St. Louis to destinations that can vary by season and schedule. The airline’s own booking system currently shows STL as a departure city, while the airport maintains a live flight-status page where passengers can search by city, flight number or airline.
Because low-cost airline schedules can change, it is better to check your specific Frontier flight number rather than relying on a general route list.
Check your Frontier flight status
STL’s official flight-status system displays information such as:
- Arrival or departure
- Flight number
- Origin or destination
- Gate
- Delay status
- Baggage information when available
For example, the airport’s live listing identifies Frontier flights by their flight number and assigned gate.
How Early Should You Arrive for a Frontier Flight at STL?
For a Frontier departure, arriving early is especially useful if you need to check baggage or have not completed online check-in.
A practical approach is to arrive with enough time for:
- Parking or transportation
- Walking to Terminal 1
- Frontier check-in or bag drop
- TSA security
- Walking to the C Concourse
- Boarding before the airline’s cutoff
TSA notes that checkpoint hours are subject to change, and STL currently lists the C Gates checkpoint from 3:30 a.m. to 10:00 p.m.
During holidays, weekends, early-morning periods and busy travel dates, give yourself additional time.
TSA Security for Frontier at STL
Frontier passengers normally use the Terminal 1 C Gates security checkpoint.
The airport currently identifies:
- T1, A Gates: serves Air Canada, Delta, United and charter flights
- T1, C Gates: serves Alaska, American and Frontier
- T2, E/F Gates: serves Southwest and international charter arrivals
This distinction is useful because going to the wrong terminal can add unnecessary travel time.
STL Terminal 1 Map for Frontier Passengers
If you are looking for a Chicago-style airport map experience but for St. Louis, the official STL terminal maps are the best reference before your trip.
The airport provides separate maps for Terminal 1 and Terminal 2. The current Terminal 1 map identifies Frontier in the airline/ticketing area and shows the A and C concourses, TSA checkpoints, baggage claim and transportation areas.
For Frontier passengers, remember:
Terminal 1 → C Concourse → C Gates
Parking and Ground Transportation
STL provides several ways to reach Terminal 1, including parking, taxis, rental-car transportation and rideshare services.
The current Terminal 1 map identifies:
- Passenger pickup
- Taxis and limousines
- Car rental pickup
- Ride-app pickup
- Hotel/motel shuttle
- Off-airport parking pickup
- Terminal shuttle to Terminal 2
Complete List of Frontier Airlines Terminals.
If someone is picking you up after a Frontier flight, confirm the arrival details before they drive to the airport because gate and baggage information can change.
What If Frontier Changes the Gate?
A gate shown when you first book your flight is not necessarily the gate you will use on departure day.
The airport’s flight-status system provides current gate information when available.
For this reason, passengers should check:
Frontier flight status + STL airport flight information + boarding pass
before heading to the gate.
Final Takeaway
For most passengers searching for frontier airlines STL terminal, the answer is straightforward: Frontier Airlines operates from Terminal 1 at St. Louis Lambert International Airport, with regular operations in the C Concourse. The airport currently lists C19 and C23 as Frontier gates.
The smartest way to avoid last-minute confusion is to check your Frontier boarding pass and STL’s live flight information on the day of travel. Terminal, gate and flight information can change, so treat the current airport information as the final reference.
