Cheap Frontier Airlines Flights
Compare fares for this major US ultra-low-cost carrier, check baggage and seating details, and learn the best time to book to keep your Frontier fare low.
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or request an offerAbout Frontier Airlines
Frontier Airlines is a major US ultra-low-cost carrier founded in 1994 and based in Denver, known for its animal-themed tail livery and aggressively unbundled fare model. Frontier continues actively expanding its network — including relaunching Bay Area service to Oakland in August 2026 — as one of the largest budget carriers in the country.
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Real-Time Fare Comparison
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Flexible Date Search
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Frontier Airlines Route Network
Frontier’s network spans an extensive point-to-point route map connecting Denver and other bases to popular destinations across the US, Mexico, the Caribbean, and Central America.
Primary Hub
Denver International Airport (DEN)
Denver International Airport (DEN) is Frontier’s primary hub, with significant additional operations from Orlando, Las Vegas, and other US gateway cities.
Alliance & Partner Airlines
Frontier Airlines is not a member of Star Alliance, oneworld, or SkyTeam and operates independently as an ultra-low-cost carrier, keeping its no-frills model simple without alliance partnerships.
Baggage, Seating & Onboard Amenities
A quick reference before you pack — always confirm exact allowances on your fare rules at booking, since they vary by route and cabin.
Carry-On & Personal Item
As an ultra-low-cost carrier, Frontier’s base “Basic” fare typically includes only a small personal item; a carry-on bag is usually a separate paid add-on.
Checked Baggage
Checked baggage is not included in the base fare and must be purchased separately — booking it online in advance is significantly cheaper than paying at the airport.
Excess Baggage Fees
Overweight, oversized, or extra bags typically incur a per-bag fee charged at check-in or online in advance — pre-paying online is usually cheaper than paying at the airport.
Seat Selection & Cabin Classes
Frontier uses a single-class Economy cabin with optional paid extras — seats are randomly assigned for free on Basic fares, while choosing a specific or extra-legroom “Stretch” seat costs an additional fee.
How to Find the Cheapest Frontier Airlines Fares
Four habits that consistently lower what you pay.
Book in the Sweet-Spot Window
For most Frontier Airlines routes, fares tend to be most competitive when booked several weeks to a few months ahead of departure, rather than at the last minute or extremely far out.
Fly Midweek and Off-Peak
Tuesday, Wednesday, and Saturday departures are usually cheaper than Friday or Sunday, and red-eye or early-morning flights often undercut peak daytime departures.
Set Fare Alerts
Track your route and let price-drop notifications do the watching, instead of checking manually every day.
Price-Tracking Tip
Compare a fixed date range over a week or two before deciding — single-day price checks can be misleading.
Compare a fixed date range over a week or two before deciding — single-day price checks can be misleading.
Use Flexible Date Search
Searching a date range instead of one fixed day often surfaces Frontier Airlines fares that are noticeably lower just one or two days earlier or later.
Check-In & Day-of-Travel
Online Check-In
Online and mobile check-in generally opens 24–48 hours before departure, letting you select or confirm your seat and download your boarding pass in advance.
Airport Arrival Times
Arrive with enough buffer for check-in, bag drop, and security — this matters more on international Aegean Airlines routes than short domestic hops.
Domestic vs. International Cutoff
International check-in and bag-drop counters usually close earlier relative to departure than domestic ones, so double-check your specific route’s cutoff.
Frequently Asked Questions
Frontier Airlines' IATA code is F9, with ICAO code FFT.
Denver International Airport (DEN) is Frontier's primary hub.
No, Frontier Airlines is an independent ultra-low-cost carrier and is not a member of Star Alliance, oneworld, or SkyTeam.
Yes, Frontier and Spirit agreed to merge in 2022, but Spirit's board ultimately chose a competing, higher offer from JetBlue instead, which itself was later blocked by a federal judge on antitrust grounds. Frontier and Spirit have remained separate companies since.
Not on the lowest "Basic" fare — a small personal item is included for free, but a full-size carry-on bag is a separate paid add-on, cheaper when purchased in advance online.
No, checked bags are not included in the base fare and must be purchased separately — booking online in advance is significantly cheaper than paying at the airport.
Seat selection is an add-on — a seat is randomly assigned for free by default, while choosing a specific or extra-legroom "Stretch" seat costs extra.
Yes, Frontier continues to add new routes and relaunch service to various markets, including a planned relaunch of Oakland (Bay Area) service in August 2026, reflecting its ongoing growth strategy.
Frontier frequently runs promotional fare sales, so booking during a sale plus choosing off-peak travel days typically produces the lowest total fare once add-ons are factored in.
Changes are generally possible for a fee plus any fare difference; refunds depend on the specific fare and any optional add-ons purchased — review the conditions carefully at checkout since low-cost fares tend to be less flexible.
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