---
title: "Ontario (ONT) airport: direct flights & routes"
description: "Flights to and from Ontario (ONT): 23 nonstop destinations on 11 airlines, including Seattle, San Francisco and Dallas. See who flies each one on 2LNR."
canonical: "https://2lnr.com/routes/ont"
url: "https://2lnr.com/routes/ont.md"
date_modified: "2026-10-23T14:17:50Z"
---

# Direct flights from Ontario (ONT)

From Ontario International Airport (ONT), 11 airlines fly nonstop to 23 destinations, led by Frontier Airlines, Alaska Airlines, and American Airlines. The busiest nonstops from Ontario go to Seattle, San Francisco, and Dallas. 2LNR monitors confirmed space on the Ontario routes flown by Alaska Airlines, American Airlines, and Delta Air Lines so you can act while it's still available.

Route data refreshed October 23, 2026. Routes and carriers reflect the schedule data behind 2LNR's route map.

Updated October 23, 2026.

Explore Ontario routes on the interactive map [Get started free](https://2lnr.com/login)

23

Nonstop destinations

11

Airlines serving ONT

Free

To get started

## About Ontario International Airport (ONT)

Ontario International Airport (ONT) is the airport serving Ontario, California, United States. Its ICAO code is KONT. Departure and arrival times at ONT are local to the America/Los\_Angeles time zone. Its nonstop network reaches 23 destinations across 4 countries.

## Confirmed upgrade & award space on Ontario routes

2LNR tracks confirmed upgrade and award space on Alaska Airlines, American Airlines, and Delta Air Lines, segment by segment and date by date. Pick any Ontario destination below to open a calendar of departures, the next 14 days free on every product and the full horizon on Pro.

### See real availability

Confirmed upgrade or award seats by date on the ONT routes 2LNR tracks, checked against live inventory so you know what's open before you book.

### Set an alert

Premium inventory turns over fast. Watch a tracked Ontario route on Pro and 2LNR notifies you when space appears.

### Plan on the map

Explore every ONT nonstop on the interactive route map, with connections and route statistics.

## All nonstop destinations from Ontario (ONT)

These are the city pairs behind flights to and from Ontario: 23 nonstop destinations with active service at Ontario International Airport. Each route links to its own page, with confirmed upgrade or award space by date where 2LNR tracks the carrier.

- [Ontario to Atlanta flights (ONT-ATL)](https://2lnr.com/routes/ont-atl.md): Delta Air Lines\
  [Return: Atlanta to Ontario](https://2lnr.com/routes/atl-ont.md)
- [Ontario to Boise flights (ONT-BOI)](https://2lnr.com/routes/ont-boi.md): Alaska Airlines\
  [Return: Boise to Ontario](https://2lnr.com/routes/boi-ont.md)
- [Ontario to Charlotte flights (ONT-CLT)](https://2lnr.com/routes/ont-clt.md): American Airlines\
  [Return: Charlotte to Ontario](https://2lnr.com/routes/clt-ont.md)
- [Ontario to Chicago flights (ONT-ORD)](https://2lnr.com/routes/ont-ord.md): American Airlines and United Airlines\
  [Return: Chicago to Ontario](https://2lnr.com/routes/ord-ont.md)
- [Ontario to Colonia Nuevo Mexico flights (ONT-BJX)](https://2lnr.com/routes/ont-bjx.md): Volaris\
  [Return: Colonia Nuevo Mexico to Ontario](https://2lnr.com/routes/bjx-ont.md)
- [Ontario to Dallas flights (ONT-DFW)](https://2lnr.com/routes/ont-dfw.md): American Airlines and Frontier Airlines\
  [Return: Dallas to Ontario](https://2lnr.com/routes/dfw-ont.md)
- [Ontario to Denver flights (ONT-DEN)](https://2lnr.com/routes/ont-den.md): Frontier Airlines and United Airlines\
  [Return: Denver to Ontario](https://2lnr.com/routes/den-ont.md)
- [Ontario to Guadalajara flights (ONT-GDL)](https://2lnr.com/routes/ont-gdl.md): Volaris\
  [Return: Guadalajara to Ontario](https://2lnr.com/routes/gdl-ont.md)
- [Ontario to Honolulu flights (ONT-HNL)](https://2lnr.com/routes/ont-hnl.md): Alaska Airlines\
  [Return: Honolulu to Ontario](https://2lnr.com/routes/hnl-ont.md)
- [Ontario to Houston flights (ONT-IAH)](https://2lnr.com/routes/ont-iah.md): Frontier Airlines and United Airlines\
  [Return: Houston to Ontario](https://2lnr.com/routes/iah-ont.md)
- [Ontario to Las Vegas flights (ONT-LAS)](https://2lnr.com/routes/ont-las.md): Frontier Airlines\
  [Return: Las Vegas to Ontario](https://2lnr.com/routes/las-ont.md)
- [Ontario to Morelia flights (ONT-MLM)](https://2lnr.com/routes/ont-mlm.md): Volaris\
  [Return: Morelia to Ontario](https://2lnr.com/routes/mlm-ont.md)
- [Ontario to New York flights (ONT-JFK)](https://2lnr.com/routes/ont-jfk.md): JetBlue Airways\
  [Return: New York to Ontario](https://2lnr.com/routes/jfk-ont.md)
- [Ontario to Oakland flights (ONT-OAK)](https://2lnr.com/routes/ont-oak.md): Frontier Airlines\
  [Return: Oakland to Ontario](https://2lnr.com/routes/oak-ont.md)
- [Ontario to Phoenix flights (ONT-PHX)](https://2lnr.com/routes/ont-phx.md): American Airlines\
  [Return: Phoenix to Ontario](https://2lnr.com/routes/phx-ont.md)
- [Ontario to Portland flights (ONT-PDX)](https://2lnr.com/routes/ont-pdx.md): Alaska Airlines and Frontier Airlines\
  [Return: Portland to Ontario](https://2lnr.com/routes/pdx-ont.md)
- [Ontario to Sacramento flights (ONT-SMF)](https://2lnr.com/routes/ont-smf.md): Frontier Airlines\
  [Return: Sacramento to Ontario](https://2lnr.com/routes/smf-ont.md)
- [Ontario to Salt Lake City flights (ONT-SLC)](https://2lnr.com/routes/ont-slc.md): Delta Air Lines\
  [Return: Salt Lake City to Ontario](https://2lnr.com/routes/slc-ont.md)
- [Ontario to San Francisco flights (ONT-SFO)](https://2lnr.com/routes/ont-sfo.md): Emirates, Frontier Airlines, and United Airlines\
  [Return: San Francisco to Ontario](https://2lnr.com/routes/sfo-ont.md)
- [Ontario to San Salvador flights (ONT-SAL)](https://2lnr.com/routes/ont-sal.md): Avianca\
  [Return: San Salvador to Ontario](https://2lnr.com/routes/sal-ont.md)
- [Ontario to Santa Rosa flights (ONT-STS)](https://2lnr.com/routes/ont-sts.md): Alaska Airlines\
  [Return: Santa Rosa to Ontario](https://2lnr.com/routes/sts-ont.md)
- [Ontario to Seattle flights (ONT-SEA)](https://2lnr.com/routes/ont-sea.md): Alaska Airlines, Delta Air Lines, and Frontier Airlines\
  [Return: Seattle to Ontario](https://2lnr.com/routes/sea-ont.md)
- [Ontario to Taipei flights (ONT-TPE)](https://2lnr.com/routes/ont-tpe.md): China Airlines and Starlux Airlines\
  [Return: Taipei to Ontario](https://2lnr.com/routes/tpe-ont.md)

Explore ONT routes on the interactive map →

## Nonstop flights to Ontario (ONT)

23 airports have nonstops to Ontario International Airport in 2LNR's schedule data. Here they are, with the airlines that fly each route.

- [Atlanta to Ontario flights (ATL-ONT)](https://2lnr.com/routes/atl-ont.md): Delta Air Lines
- [Boise to Ontario flights (BOI-ONT)](https://2lnr.com/routes/boi-ont.md): Alaska Airlines
- [Charlotte to Ontario flights (CLT-ONT)](https://2lnr.com/routes/clt-ont.md): American Airlines
- [Chicago to Ontario flights (ORD-ONT)](https://2lnr.com/routes/ord-ont.md): American Airlines and United Airlines
- [Colonia Nuevo Mexico to Ontario flights (BJX-ONT)](https://2lnr.com/routes/bjx-ont.md): Volaris
- [Dallas to Ontario flights (DFW-ONT)](https://2lnr.com/routes/dfw-ont.md): American Airlines and Frontier Airlines
- [Denver to Ontario flights (DEN-ONT)](https://2lnr.com/routes/den-ont.md): Frontier Airlines and United Airlines
- [Guadalajara to Ontario flights (GDL-ONT)](https://2lnr.com/routes/gdl-ont.md): Volaris
- [Honolulu to Ontario flights (HNL-ONT)](https://2lnr.com/routes/hnl-ont.md): Alaska Airlines
- [Houston to Ontario flights (IAH-ONT)](https://2lnr.com/routes/iah-ont.md): Frontier Airlines and United Airlines
- [Las Vegas to Ontario flights (LAS-ONT)](https://2lnr.com/routes/las-ont.md): Frontier Airlines
- [Morelia to Ontario flights (MLM-ONT)](https://2lnr.com/routes/mlm-ont.md): Volaris
- [New York to Ontario flights (JFK-ONT)](https://2lnr.com/routes/jfk-ont.md): JetBlue Airways
- [Oakland to Ontario flights (OAK-ONT)](https://2lnr.com/routes/oak-ont.md): Frontier Airlines
- [Phoenix to Ontario flights (PHX-ONT)](https://2lnr.com/routes/phx-ont.md): American Airlines
- [Portland to Ontario flights (PDX-ONT)](https://2lnr.com/routes/pdx-ont.md): Alaska Airlines and Frontier Airlines
- [Sacramento to Ontario flights (SMF-ONT)](https://2lnr.com/routes/smf-ont.md): Frontier Airlines
- [Salt Lake City to Ontario flights (SLC-ONT)](https://2lnr.com/routes/slc-ont.md): Delta Air Lines
- [San Francisco to Ontario flights (SFO-ONT)](https://2lnr.com/routes/sfo-ont.md): Frontier Airlines and United Airlines
- [San Salvador to Ontario flights (SAL-ONT)](https://2lnr.com/routes/sal-ont.md): Avianca
- [Santa Rosa to Ontario flights (STS-ONT)](https://2lnr.com/routes/sts-ont.md): Alaska Airlines
- [Seattle to Ontario flights (SEA-ONT)](https://2lnr.com/routes/sea-ont.md): Alaska Airlines, Delta Air Lines, and Frontier Airlines
- [Taipei to Ontario flights (TPE-ONT)](https://2lnr.com/routes/tpe-ont.md): China Airlines and Starlux Airlines

## Airlines that fly out of Ontario (ONT)

The carriers with nonstop service from Ontario International Airport, ordered by how many destinations each one reaches. Each links to that airline's full route map.

- [Frontier Airlines (F9)](https://2lnr.com/routes/airlines/f9.md)
- [Alaska Airlines (AS)](https://2lnr.com/routes/airlines/as.md)
- [American Airlines (AA)](https://2lnr.com/routes/airlines/aa.md)
- [United Airlines (UA)](https://2lnr.com/routes/airlines/ua.md)
- [Delta Air Lines (DL)](https://2lnr.com/routes/airlines/dl.md)
- [Volaris (Y4)](https://2lnr.com/routes/airlines/y4.md)
- [Avianca (AV)](https://2lnr.com/routes/airlines/av.md)
- [JetBlue Airways (B6)](https://2lnr.com/routes/airlines/b6.md)
- [China Airlines (CI)](https://2lnr.com/routes/airlines/ci.md)
- [Emirates (EK)](https://2lnr.com/routes/airlines/ek.md)
- [Starlux Airlines (JX)](https://2lnr.com/routes/airlines/jx.md)

## Alternative airports near Ontario (ONT)

Nearby airports with nonstop service of their own, closest first. Distances are great-circle between the two airports' coordinates, not driving time, so check the ground connection before you treat one as a substitute.

- [Santa Ana (SNA)](https://2lnr.com/routes/sna.md) (30 miles, 40 nonstop destinations)
- [Long Beach (LGB)](https://2lnr.com/routes/lgb.md) (36 miles, 4 nonstop destinations)
- [Hawthorne (HHR)](https://2lnr.com/routes/hhr.md) (43 miles, 3 nonstop destinations)
- [Burbank (BUR)](https://2lnr.com/routes/bur.md) (45 miles, 25 nonstop destinations)
- [Los Angeles (LAX)](https://2lnr.com/routes/lax.md) (48 miles, 174 nonstop destinations)
- [Santa Monica (SMO)](https://2lnr.com/routes/smo.md) (49 miles, 4 nonstop destinations)

[United States flights by airport](https://2lnr.com/routes/to/united-states.md)

- [How Alaska upgrades clear](https://2lnr.com/about/as/upgrades.md)
- [How to read award availability by date](https://2lnr.com/guides/award-availability.md)

## Frequently asked questions about Ontario (ONT)

**How many nonstop destinations does Ontario International Airport (ONT) serve?**

Ontario International Airport has active nonstop service to 23 destinations in 2LNR's schedule data. The busiest markets from ONT are Seattle, San Francisco, and Dallas. The full list, with who flies each route and, where 2LNR tracks the carrier, upgrade and award space by date, is on this page.

**Which airlines fly out of Ontario (ONT)?**

The carriers with nonstop service from Ontario International Airport are listed in full on this page, each linked to its own route map. Frontier Airlines, Alaska Airlines, and American Airlines run the most routes from Ontario, in that order. In 2LNR's schedule data that is 11 airlines in total.

**How many airlines fly out of ONT?**

2LNR's schedule data currently shows 11 airlines with at least one nonstop route from Ontario (ONT). That figure counts the carrier operating the flight rather than every carrier that sells a seat on it, so a codeshare marketed by a partner is not counted twice, and it moves with the season.

**How do I check upgrade or award availability from ONT?**

Pick any destination on this page, such as Seattle, to open a calendar of ONT departures with confirmed upgrade and award space on Alaska Airlines, American Airlines, and Delta Air Lines by date, the next 14 days free on every product and the full horizon on Pro. On Pro you can also set an alert so 2LNR notifies you when space opens.

**Does 2LNR track flights from ONT?**

Yes. Every nonstop route from Ontario International Airport in 2LNR's schedule data is listed, 23 destinations in total, and on the routes flown by Alaska Airlines, American Airlines, and Delta Air Lines what is shown is confirmed availability rather than a forecast, the next 14 days free on every product and the full horizon on Pro.

**Where can you fly nonstop from Ontario (ONT)?**

From Ontario (ONT), 2LNR's schedule data shows nonstop flights to Atlanta, Boise, Charlotte, Chicago, Colonia Nuevo Mexico, Dallas, Denver, Guadalajara, Honolulu, Houston, Las Vegas, Morelia, New York, Oakland, Phoenix, Portland, Sacramento, Salt Lake City, San Francisco, San Salvador, Santa Rosa, Seattle, and Taipei. This page lists every one, with the airlines that fly it.

## Never miss ONT upgrade or award space

See what's open by date on these routes, the next 14 days free on every product and the full horizon on Pro.

[Get started free](https://2lnr.com/login)