Turf war: 2 US airlines go head-to-head with major expansions in Puerto Rico
The mercury is rising in Puerto Rico, and that's not necessarily because spring is approaching.
Instead, a heated turf war for dominance in the territory's aviation market appears to be unfolding between America's two largest ultra-low-cost carriers.
Spirit Airlines announced Wednesday that it's adding five new routes and boosting service on four others to San Juan's Luis Muñoz Marín International Airport (SJU), as you can see in the table below.
| Destination | New/existing | Frequency | Start date |
|---|---|---|---|
Atlanta. | New | Daily. | May 5. |
Baltimore. | Additional flights. | Twice daily. | Frequency increases May 5. |
Chicago. | New. | Daily. | May 5. |
Dallas. | New. | Daily. | May 5. |
Detroit. | New. | Daily. | May 5. |
Fort Lauderdale. | Additional flights. | Twice daily. | Frequency increases April 5. |
Hartford. | New. | Three times weekly. | June 7. |
Newark. | Additional flights. | Twice daily. | Frequency increases June 7. |
Orlando. | Additional flights. | 5 times daily. | Frequency increases May 5. |
Once the new service launches, Spirit will become the second-largest carrier by destinations, seats and available seat miles to the island territory.
By June, the Miramar, Florida-based carrier will offer up to 21 daily departures from San Juan. Overall, Spirit will now serve 16 total nonstop routes from the three airports it serves in the territory.
"Spirit Airlines has served the Puerto Rican community for more than two decades, offering affordable fares to connect family and friends across the United States," John Kirby, vice president of network planning, said in a statement. "Puerto Rico is our number one destination in the Caribbean, with its rich history and culture, renowned beaches, tropical rainforest and the world's brightest bioluminescent bay."
Spirit first landed on the island in 2001 with service to San Juan and has since grown its Puerto Rico route map to include Aguadilla in 2007 and Ponce, returning to the latter in 2022 after previously serving it from 2007 to 2008.

As part of Wednesday's announcement, the airline was also keen to mention its involvement in the local community, which includes work with multiple nonprofits and donations of over $100,000 for hurricane relief efforts.
While Puerto Rico has long been a popular destination in the Caribbean, Spirit's latest expansion there comes on the heels of a similar announcement from one of its biggest rivals, Frontier Airlines.
Two weeks ago, Frontier announced its own major expansion in the territory, with the addition of eight new routes, all launching in May, as you can see in the table below.
| From | To | Start date | Frequency |
|---|---|---|---|
Cleveland Hopkins International Airport (CLE). | Luis Muñoz Marín International Airport (SJU) | May 4. | Four times a week. |
Detroit Metropolitan Wayne County Airport (DTW). | SJU. | May 5. | Four times a week. |
Baltimore/Washington International Thurgood Marshall Airport (BWI). | SJU. | May 4. | Daily. |
Midway International Airport (MDW). | SJU. | May 4. | Six times a week. |
Dallas Fort Worth International Airport (DFW). | SJU. | May 4. | Daily. |
Cancun International Airport (CUN). | SJU. | May 25. | Three times a week. |
Orlando International Airport (MCO). | Mercedita International Airport (PSE). | May 4. | Three times a week. |
Tampa International Airport (TPA). | Rafael Hernández International Airport (BQN). | May 4. | Three times a week. |
With these new flights, Frontier will offer a total of 19 nonstop routes to the island, crowning the airline as the largest carrier serving Puerto Rico by the number of markets served.
Frontier's expansion perhaps caught the attention of the network planners at Spirit, who weren't ready to let one of its no-frills competitors gain a share in a key market.
So, it's likely no surprise that Spirit is retaliating by adding new or expanded service in all but one of the new San Juan markets that were just announced by Frontier. Additionally, Spirit is adding a route from San Juan to Atlanta, which happens to be one of Frontier's biggest focus cities.

Further pushing back against its rival, Spirit will launch most of its new flights on May 5, just one day after Frontier's big expansion commences.
It'll be interesting to see whether the two airlines can maintain all this new service. However, the biggest winners are travelers who are looking for cheap tickets to and from Puerto Rico.
Related: 8 reasons to visit Puerto Rico in 2023
Frontier's expansion came with introductory fares starting at $49, and now Spirit's new flights will start at just $59.
Of course, whichever airline you choose, you'll be on the hook for what could be hundreds of dollars in additional fees for seat assignments, bags, changes and more.
In terms of the passenger experience, Spirit definitely has the upper hand — the airline offers (nearly) fleetwide Wi-Fi, as well as the ability to purchase spacious and comfortable Big Front Seats.
That said, Frontier is poised to become Puerto Rico's largest carrier, but Spirit is busy closing that gap.
TPG featured card
at American Express's secure site
Terms & restrictions apply. See rates & fees.
| 3X | Earn 3X Miles on Delta purchases. |
| 1X | Earn 1X Miles on all other eligible purchases. |
Pros
- Delta SkyClub access when flying Delta
- Annual companion ticket for travel on Delta (upon renewal)
- Ability to earn MQDs through spending
- Various statement credits for eligible purchases
Cons
- Steep annual fee of $650
- Other Delta cobranded cards offer superior earning categories
- Earn 100,000 Bonus Miles after you spend $6,000 or more in purchases with your new Card within the first 6 months of Card Membership and an additional 25,000 bonus miles after you make an additional $3,000 in purchases on the Card within your first 6 months, starting from the date that your account is opened. Offer Ends 04/01/2026.
- Delta SkyMiles® Reserve American Express Card Members receive 15 Visits per Medallion® Year to the Delta Sky Club® when flying Delta and can unlock an unlimited number of Visits after spending $75,000 in purchases on your Card in a calendar year. Plus, you’ll receive four One-Time Guest Passes each Medallion Year so you can share the experience with family and friends when traveling Delta together.
- Enjoy complimentary access to The Centurion® Lounge in the U.S. and select international locations (as set forth on the Centurion Lounge Website), Sidecar by The Centurion® Lounge in the U.S. (see the Centurion Lounge Website for more information on Sidecar by The Centurion® Lounge availability), and Escape Lounges when flying on a Delta flight booked with the Delta SkyMiles® Reserve American Express Card. § To access Sidecar by The Centurion® Lounge, Card Members must arrive within 90 minutes of their departing flight (including layovers). To access The Centurion® Lounge, Card Members must arrive within 3 hours of their departing flight. Effective July 8, 2026, during a layover, Card Members must arrive within 5 hours of the connecting flight.
- Receive $2,500 Medallion® Qualification Dollars with MQD Headstart each Medallion Qualification Year and earn $1 MQD for each $10 in purchases on your Delta SkyMiles® Reserve American Express Card with MQD Boost to get closer to Status next Medallion Year.
- Enjoy a Companion Certificate on a Delta First, Delta Comfort, or Delta Main round-trip flight to select destinations each year after renewal of your Card. The Companion Certificate requires payment of government-imposed taxes and fees of between $22 and $250 (for itineraries with up to four flight segments). Baggage charges and other restrictions apply. Delta Basic experiences are not eligible for this benefit.
- $240 Resy Credit: When you use your Delta SkyMiles® Reserve American Express Card for eligible purchases with U.S. Resy restaurants, you can earn up to $20 each month in statement credits. Enrollment required.
- $120 Rideshare Credit: Earn up to $10 back in statement credits each month after you use your Delta SkyMiles® Reserve American Express Card to pay for U.S. rideshare purchases with select providers. Enrollment required.
- Delta SkyMiles® Reserve American Express Card Members get 15% off when using miles to book Award Travel on Delta flights through delta.com and the Fly Delta app. Discount not applicable to partner-operated flights or to taxes and fees.
- With your Delta SkyMiles® Reserve American Express Card, receive upgrade priority over others with the same Medallion tier, product and fare experience purchased, and Million Miler milestone when you fly with Delta.
- Earn 3X Miles on Delta purchases and earn 1X Miles on all other eligible purchases.
- No Foreign Transaction Fees. Enjoy international travel without additional fees on purchases made abroad.
- $650 Annual Fee.
- Apply with confidence. Know if you're approved for a Card with no impact to your credit score. If you're approved and you choose to accept this Card, your credit score may be impacted.
- Terms Apply.
- See Rates & Fees


