Flights New York → Denver — September 18, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Friday, September 18, 2026 on the New York–Denver route: 1 stop itinerary (2 flights) via Dallas/Fort Worth (DFW), from New York LaGuardia (LGA) to Denver International (DEN), first flight Frontier Airlines F93423, departs 8:29 PM, arrives 8:15 AM the next day, total travel time 13h 46m including layovers, flight time 6h 9m (layovers excluded), $225 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 6, 2026 and read by AirSource on September 10, 2026, 21:21 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: JetBlue B61497, from New York JFK (JFK) to Denver International (DEN), departs 12:00 PM, arrives 2:17 PM, direct, 4h 17m, $272 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.