Customer Service

Air Partnerships

Great Lakes Airlines Codeshare

Frontier codeshares with Great Lakes Airlines to extend our reach to smaller communities around the western United States. A codeshare is an agreement made between Frontier Airlines and another air carrier whereby Frontier may market and sell tickets for flights on the other carrier that are identified by Frontier's "F9" designator code (e.g. F9 Flight 123). Through this codeshare, Frontier serves over 35 additional destinations with convenient connections to Frontier flights in Denver, Los Angeles, and Phoenix. The codeshare is only in effect if the Great Lakes flight is booked in conjunction with a connecting Frontier flight. Make your reservations for Great Lakes codeshare flights on FlyFrontier.com. For flights exclusively on Great Lakes, bookings should be made directly with Great Lakes at www.flygreatlakes.com. When traveling on Great Lakes flights ticketed as a Frontier codeshare, EarlyReturns^® members will earn valuable miles just like on any other Frontier flight.  For details on Great Lakes codeshare flights and information on how the codeshare works with our Fare Options, please visit our Air Partnerships FAQ page.

Interline Ticketing Agreements

Frontier maintains interline ticketing agreements with other airlines, allowing you to book convenient connecting itineraries to more destinations around the world. Frontier has interline electronic ticketing arrangements with each of its interline partners, allowing you to travel on both airlines with one electronic ticket. When you connect between Frontier and any interline partner, your baggage will be checked through to your final destination provided you have one ticket for travel on Frontier and your connecting flight on the other airline. Frontier may also use its interline partners for reprotection in the unlikely event of a Frontier flight irregularity as explained in our Customer Commitment.

Frontier currently has interline airline ticketing agreements with:

As an additional benefit for customers connecting from Frontier to American Airlines, Icelandair, or Korean Airlines, you can receive your boarding passes through to your final destination when you check in at a Frontier ticket counter. American Airlines, Icelandair, and Korean Airlines will also be able to issue a boarding pass for your connecting Frontier flights if you are starting travel with them.

Baggage and Service Fees for Tickets with Travel on Frontier and Other Airlines

Frontier’s baggage fees and allowances may not apply if you are traveling on an itinerary involving travel on Frontier and another airline, known as an interline itinerary. Frontier will honor baggage allowances and collect baggage fees in accordance with the DOT regulations. On domestic interline itineraries, the allowances and fees of the first marketing carrier on the ticket will apply for all travel on the ticket, including any return trip. For example, if you fly roundtrip and your first flight on the outbound is operated by Frontier, Frontier’s baggage fees would apply both ways. If your first flight is on an airline other than Frontier, we encourage you to contact the appropriate airline on your ticket to determine baggage fees and allowances according to these rules.  Please note that complimentary first and second bags for Ascent and Summit level members of EarlyReturns^® only apply on flights operated by Frontier and on codeshare flights operated by Great Lakes Airlines.

On international itineraries, the fees of the most significant carrier will apply for all travel on the ticket, including any return trip. The most significant carrier is usually the first airline operating an international flight on the ticket. For more details on the baggage allowances and fees that will apply for your travel, we encourage you to contact the appropriate airline on your ticket according to these rules.  Please note that complimentary first and second bags for Ascent and Summit level members of EarlyReturns^® only apply on flights operated by Frontier and on codeshare flights operated by Great Lakes Airlines.

Frontier will not through-check bags to another airline’s flight(s) unless the Frontier Airlines flight and the other airline flight(s) are on the same ticket. Likewise, we will prohibit other airlines from through-checking bags to Frontier flights unless they are booked on the same ticket. This means that if you have a separate ticket for a connecting flight on another airline, Frontier will only check your bag on the Frontier flight and not on the other airline’s flight. In this case, you will need to claim your bag after your Frontier flight and proceed to check-in with the other airline.

Baggage rules and other optional fees for Frontier’s interline partners may be found through the links below:

• Air New Zealand
• Air Pacific
• Alaska Airlines
• American Airlines
• Asiana Airlines
• Avianca Airlines
• Cape Air
• China Airlines
• Emirates Airlines
• ERA Aviation
• EVA Air
• Great Lakes Airlines
• Hainan Airlines
• Hawaiian Airlines
• Iberia Airlines
• Icelandair
• Korean Airlines
• LACSA Airlines
• Qantas Airways
• Singapore Airlines
• Sun Country Airlines
• TACA Airlines
• US Airways
• Virgin Australia
• Virgin America