Since the demise of the airline, there was a substantial and significant body of routes that were operating for budget-conscious travelers throughout the country. The no-man's lands are quickly filled in the low-cost airline world, and Frontier Airlines is making a serious push for them. The carrier has introduced eight new one-stop destinations this week, including Boston, Dallas, Detroit, Las Vegas and more, at fares as low as $39 one-way.

If one of these city pairs is your summer travel plan, it's a perfect match. The summer travel season has begun, there's a variety of inexpensive travel options available on established routes, and Frontier has a new line of budget flights with promotional fares guaranteed through July 12.

‍The New Routes: Where Frontier Is Flying

The expansion covers nine airports, a combination of daily and multi-weekly services, with most of the new routes starting from July 5 or 6, 2026. The cities are located across the country, from the East Coast to the Midwest, South and Southwest, and mirror Frontier's opportunistic nature in filling in the void left by Spirit.

A brief summary of what has just become available to book and what the free fares are:

• Daily flights from Boston (BOS) to Orlando (MCO) for $69 each way.
• Dallas Fort Worth (DFW) ↔ New Orleans (MSY): $39 one-way daily lowest of the new round-up of fares.
• Detroit (DTW) ↔ Fort Lauderdale (FLL): $49 one way daily
• Detroit (DTW) ↔ New York (JFK): $55 each way daily.Detroit (DTW) ↔ New Jersey (LGA): $55 each way daily.
• Detroit (DTW) ↔ Las Vegas (LAS): $79 one way, daily.
• Kansas City (MCI) ↔ Las Vegas (LAS): 4x weekly for $69 each way
• Orlando (MCO) ↔ Memphis (MEM): 3 times daily, $69 each-way.
• Orlando (MCO) ↔ Richmond (RIC): 3 times a day, from $59 per way.

The majority are on a daily basis, the Kansas City-Las Vegas service four times a week, and the Orlando-Memphis and Orlando-Richmond services three days a week. If your travel plans are on a tight schedule, especially the less common routes, this may be a fact that you'll want to bear in mind when creating your trip around these flights a day-of-day limitation could make the planning process a bit more complex.

The reasons behind Frontier's rapid pace of travel

When an airline folds, it's a swift-moving industry, and Frontier has the experience to recognize and capitalize on the opportunities. However, when Spirit shut down, it wasn't only a competitor being eliminated, it was immediate demand holes developing on routes that were seeing actual passenger traffic. Those who had been flying between Detroit and Fort Laud or Dallas and New Orleans on Spirit were not prevented from traveling, they simply lost the low-cost option that had been flying those routes.

The strategy here is textbook opportunistic expansion trespass into market segments that are not adequately served by other carriers with a low price offer, create awareness of such services rapidly and build frequency before other carriers respond with a competing service. The $39 Dallas to New Orleans rate is very aggressive at that price, it's an option that could be tempting even for people who weren't in the market for a trip to New Orleans before they saw the promotion.

The window for the introductory fare is really brief

The discounts that make these new routes really enjoyable have a set expiration date. The promotion only runs from August 3, 2026 through September 2, 2026 on specific days of the week and booking is limited to 11:59 PM ET on July 12, 2026. This gives approximately 5 weeks of travel time in the late summer shoulder season (before Labor Day weekend rates kick in).

Some of the practicalities: The round-trip is not necessary to get the promotional rate, nor is it necessary to get the hotel's best rate. It's a nice amenity for travelers who want to reserve only one leg or have a trip involving Frontier's new service plus an airline they're using for the outbound leg.

Some routes will offer promotional fares for all of August 3-September 2, while others won't. Availability is dependent on the specific travel date and the day of week, so the earlier you search and book the better the availability will be. If at all possible, flexibility on exact travel dates is your best way to get the $39 or $49 fares not to know that they are sold out on the dates you want.

Are these routes trustworthy for the long term?

It is a good question at any time that a budget airline enters new markets with low fares. These are not trial runs but true permanent additions to the network that are operating on the majority of routes with daily service, indicating more than just an experimental weekend-only operation. However, as airlines assess their actual performance to actual demand, frequency on new routes does change and can change.

The 3 weekly and 4 weekly routes (Orlando-Memphis, Orlando-Richmond, Las Vegas-Kansas City) have a higher degree of uncertainty in regards to long-term viability than the daily routes. If you are thinking of constructing your future trip around one of those low-frequency routes, it would be prudent to check with Frontier's web site closer to your travel date to see if there was any change in their schedule.

The Broader Context: Budget Travel After Spirit:

Spirit's withdrawal from the industry was significant when it comes to price-sensitive travelers that have been relying on the carrier for their regular transportation needs because of its ultra-low pricing. The product was not a favorite for Spirit but the high level of competition for the routes that it served kept fares on those routes lower than they would have been otherwise. When a low-cost carrier goes out of business, there's a window for existing carriers to increase their airfares on the routes that are affected and that's why Frontier's quick rise with sub-$50 fares is important.

This expansion is a significant reintroduction of affordable connectivity for travellers, especially in Detroit. There's even daily Frontier service to Fort Lauderdale, Las Vegas and Philadelphia, three places where Spirit had been a price anchor.

The Bottom Line

Frontier has introduced eight new nonstop flights this week that take a straight shot to the markets it sees as Spirit's turf, including some that are far as $39 one way. Routes run through Boston, Dallas, Detroit, Fort Lauderdale, Las Vegas, Kansas City, Memphis, New Orleans, Orlando, Philadelphia and Richmond and most run daily. 

Bookings for promotional pricing are limited to July 12, 2026 and will apply for travel from August 3 September 2, 2026 on specific days of the week. If booking within the window is the only thing that makes the trip work, the only practical thing to do is to move on a date before Saturday's deadline for those that plan on traveling in these city pairs.