Direct (nonstop) flights from Boise to Denver
3 airlines fly nonstop from Boise Air Terminal (BOI) to Denver International (DEN). It's 649 miles (1,044 km), about 1h 55m in the air. Operated by Frontier Airlines, United Airlines, Southwest Airlines.
Frontier Airlines
United Airlines
Southwest Airlines
Route data last updated: May 26, 2026
Airlines with non-stop flights
F9
Frontier Airlines
UA
United Airlines
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Boise to Denver with one stop · direct emits 120 kg CO₂ per passenger
Looking for the return flight?
DEN → BOI: Flights from Denver to BoiseOther direct flights from Boise
Direct flights from Denver (DEN)
Frequently Asked Questions
How long is the direct flight from Boise to Denver?
A nonstop flight from Boise (BOI) to Denver (DEN) takes approximately 1 hours and 55 minutes. The distance is 649 miles (1,044 km).
Which airlines fly nonstop from Boise to Denver?
3 airlines: Frontier Airlines, United Airlines, Southwest Airlines.
Is there a nonstop flight from Boise to Denver?
Yes. 3 airlines: Frontier Airlines, United Airlines, Southwest Airlines.
How far is Boise from Denver?
The flight distance from Boise to Denver is 649 miles (1,044 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as the length of Italy.
What type of aircraft flies from Boise to Denver?
At 1h 55m, this route typically uses narrow-body aircraft — Boeing 737 or Airbus A320. Varies by airline.
What is the carbon footprint of a flight from Boise to Denver?
Roughly 120 kg CO2 per passenger one-way. That's about the same as driving 600 km.
Is the return flight from Denver to Boise also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Boise to Denver?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Boise Air Terminal for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.