Ontario (ONT) to Denver (DEN) flights
An economy award from Ontario (ONT) to Denver (DEN) starts at 7,500 miles one way with Avianca LifeMiles on United Airlines, plus taxes and fees from $30.60. 3 airlines fly nonstop from Ontario (ONT) to Denver (DEN): Frontier Airlines, Southwest Airlines and United Airlines. The two airports are 817 miles (1,315 km) apart. United Airlines is in Star Alliance. There are also 9 ways to fly it with one stop, through Las Vegas, Phoenix and Salt Lake City and more.
How many miles ONT to DEN costs
Economy, one way, on the nonstop flights, from the Award Flight Pricer's award charts. Ranges run off-peak to peak; "from" is the floor of a dynamic price.
| Program | Economy | Taxes and fees |
|---|---|---|
| Avianca LifeMilesOn United Airlines | 7,500 | $30.60 |
| Air Canada AeroplanOn United Airlines | 10,000 | $33.60 |
| Emirates SkywardsOn United Airlines | 12,000 | $5.60–355.60 |
| ANA Mileage ClubOn United Airlines | 15,000 | $5.60 |
| Singapore Airlines KrisFlyerOn United Airlines | 15,000 | $5.60 |
| Turkish Airlines Miles&SmilesOn United Airlines | 15,000 | $5.60–45.60 |
| Thai Royal Orchid PlusOn United Airlines | 17,500 | $5.60 |
| EVA Air Infinity MileageLandsOn United Airlines | 19,500 | $5.60 |
| TAP Miles&GoOn United Airlines | 30,000 | $50.40 |
Business and first class prices are in the Award Flight Pricer. Chart prices need award space on your date, so search it before you transfer points.
Compare every program in the Award Flight PricerAirlines flying nonstop from ONT 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 ONT 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
ONT to DEN with one stop
9 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Las Vegas (LAS)Southwest Airlines and Frontier Airlines the whole way
- Via Phoenix (PHX)American Airlines and Southwest Airlines the whole way
+1 - Via Salt Lake City (SLC)Delta Air Lines the whole way
+1 - Via San Jose (SJC)Southwest Airlines the whole way
- Via Sacramento (SMF)Southwest Airlines and Frontier Airlines the whole way
- Via Boise (BOI)Alaska Airlines, then Frontier Airlines, United Airlines and 1 more
- Via Oakland (OAK)Southwest Airlines the whole way
- Via San Francisco (SFO)United Airlines and Frontier Airlines the whole way
- Via Santa Rosa (STS)Alaska Airlines, then Southwest Airlines
ONT to DEN: common questions
How many miles does ONT to DEN cost?
In economy it starts at 7,500 miles one way with Avianca LifeMiles on United Airlines, plus taxes and fees from $30.60. Next cheapest: Air Canada Aeroplan (10,000), Emirates Skywards (12,000) and ANA Mileage Club (15,000). These are award chart prices from the Award Flight Pricer. Programs that price dynamically can cost more on busy dates, so check yours before you transfer points. Business and first class prices are in the pricer too.
Which airlines fly nonstop from ONT to DEN?
Frontier Airlines, Southwest Airlines and United Airlines (Star Alliance) fly nonstop from Ontario (ONT) to Denver (DEN).
How far is Ontario from Denver by plane?
Ontario (ONT) and Denver (DEN) are 817 miles (1,315 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book ONT 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.
Where can I connect between Ontario and Denver?
The most direct connections are through Las Vegas (LAS), Phoenix (PHX), Salt Lake City (SLC), San Jose (SJC) and Sacramento (SMF). On 7 of them the same airline flies both flights, for example Southwest Airlines through Las Vegas.
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.