Boise (BOI) to Denver (DEN) flights
3 airlines fly nonstop from Boise (BOI) to Denver (DEN): Frontier Airlines, Southwest Airlines and United Airlines. The two airports are 648 miles (1,043 km) apart. United Airlines is in Star Alliance. There are also 17 ways to fly it with one stop, through Salt Lake City, Bozeman and Spokane and more.
Airlines flying nonstop from BOI to DEN
- Frontier AirlinesNot in an allianceWho books it
- Southwest AirlinesNot in an allianceWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book BOI to DEN with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Air Canada AeroplanBooks United Airlines
- Air New Zealand AirpointsBooks United Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- JetBlue TrueBlueBooks United Airlines
- Lufthansa Miles & MoreBooks United Airlines
- Singapore Airlines KrisFlyerBooks United Airlines
- TAP Miles&GoBooks United Airlines
- Thai Royal Orchid PlusBooks United Airlines
- Turkish Airlines Miles&SmilesBooks United Airlines
- United MileagePlusBooks United Airlines
BOI to DEN with one stop
17 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Salt Lake City (SLC)Delta Air Lines the whole way
+1 - Via Bozeman (BZN)Alaska Airlines, then United Airlines and Southwest Airlines
- Via Spokane (GEG)Alaska Airlines, then United Airlines and Southwest Airlines
- Via Las Vegas (LAS)Southwest Airlines and Frontier Airlines the whole way
- Via Portland (PDX)Alaska Airlines the whole way+1
- Via Phoenix (PHX)American Airlines and Southwest Airlines the whole way
+1 - Via Sacramento (SMF)Southwest Airlines the whole way
- Via Seattle (SEA)Alaska Airlines and Delta Air Lines the whole way+3
- Via Palm Springs (PSP)Alaska Airlines, then United Airlines and Southwest Airlines
- Via Santa Rosa (STS)Alaska Airlines, then Southwest Airlines
- Via Oakland (OAK)Southwest Airlines the whole way
- Via San Jose (SJC)Southwest Airlines the whole way
- Via Ontario (ONT)Alaska Airlines, then Frontier Airlines, United Airlines and 1 more
- Via San Francisco (SFO)United Airlines the whole way
- Via Burbank (BUR)Southwest Airlines the whole way
BOI to DEN: common questions
Which airlines fly nonstop from BOI to DEN?
Frontier Airlines, Southwest Airlines and United Airlines (Star Alliance) fly nonstop from Boise (BOI) to Denver (DEN).
How far is Boise from Denver by plane?
Boise (BOI) and Denver (DEN) are 648 miles (1,043 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book BOI to DEN award flights?
13 programs can book at least one of the nonstop airlines: Air Canada Aeroplan, Air New Zealand Airpoints, ANA Mileage Club, Avianca LifeMiles, Emirates Skywards, EVA Air Infinity MileageLands, JetBlue TrueBlue, Lufthansa Miles & More and 5 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does BOI to DEN cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for BOI to DEN with taxes and fees.
Where can I connect between Boise and Denver?
The most direct connections are through Salt Lake City (SLC), Bozeman (BZN), Spokane (GEG), Las Vegas (LAS) and Portland (PDX). On 11 of them the same airline flies both flights, for example Delta Air Lines through Salt Lake City.
More routes
Routes are scheduled nonstop flights. The route data is refreshed monthly; this list was last checked November 11, 2026. Seasonal routes and new launches can be missing or end early, so confirm with the airline before you book. Distances are great-circle, the shortest path between the two airports.