--- title: "Ontario (ONT) to Oakland (OAK) flights: who flies it" description: "Frontier Airlines flies nonstop from ONT to OAK, about 5 flights a week as F9 4221, scheduled at 1h 20m to 1h 25m. See the full timetable and who flies it on 2LNR." canonical: "https://2lnr.com/routes/ont-oak" url: "https://2lnr.com/routes/ont-oak.md" date_modified: "2026-10-18T05:10:47Z" --- # Ontario to Oakland (ONT-OAK): nonstop flights and who flies them Frontier Airlines flies the ONT to OAK nonstop about 5 times a week. In the timetable below it flies as F9 4221, scheduled at 1h 20m to 1h 25m for the 362 miles. Schedule last confirmed October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 23, 2026. See ONT to OAK on the interactive map [Get started free](https://2lnr.com/login) 5 Flights a week, 4-week average 1h 20m to 1h 25m Scheduled flight time 362 mi Nonstop distance Free To get started ## Ontario to Oakland flight schedule Scheduled nonstop departures for ONT to OAK starting October 23, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book. Scheduled nonstop departures from Ontario (ONT) to Oakland (OAK) | Date | Flight | Airline | Departs ONT | Arrives OAK | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Sat, Nov 21 | F9 4221 | Frontier Airlines | 13:37 | 14:57 | 1h 20m | [Airbus A321neo family](https://2lnr.com/seatmaps/f9/a321neo.md) | | Sun, Nov 22 | F9 4221 | Frontier Airlines | 16:53 | 18:18 | 1h 25m | Airbus A321neo family | | Tue, Nov 24 | F9 4221 | Frontier Airlines | 16:53 | 18:18 | 1h 25m | Airbus A321neo family | | Thu, Nov 26 | F9 4221 | Frontier Airlines | 13:36 | 14:56 | 1h 20m | Airbus A321neo family | | Sat, Nov 28 | F9 4221 | Frontier Airlines | 13:37 | 14:57 | 1h 20m | Airbus A321neo family | | Sun, Nov 29 | F9 4221 | Frontier Airlines | 12:24 | 13:44 | 1h 20m | [Airbus A320neo](https://2lnr.com/seatmaps/f9/a320neo.md) | Showing all 6 scheduled ONT to OAK departures across 6 days with service, starting October 23, 2026. Later dates are on the interactive map. Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure. See every ONT to OAK date on the interactive map ## Aircraft on the Ontario to Oakland nonstop Frontier Airlines flies the departures in the schedule table on this page with the [Airbus A321neo family](https://2lnr.com/seatmaps/f9/a321neo.md) and the [Airbus A320neo](https://2lnr.com/seatmaps/f9/a320neo.md). Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## The full ONT to OAK nonstop schedule This page carries the full ONT to OAK nonstop schedule, who operates each departure and how often it runs; the reverse direction is linked below. ### See the schedule Who operates each ONT to OAK nonstop and how often it runs, from 2LNR's schedule data. ### Plan on the map See ONT to OAK on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying Ontario to Oakland nonstop Carriers operating ONT to OAK nonstop in the current schedule. - [Frontier Airlines (F9) route map](https://2lnr.com/routes/airlines/f9.md)\ [The aircraft F9 flies](https://2lnr.com/seatmaps/f9.md) See ONT to OAK on the interactive map → ## Frequently asked questions about ONT to OAK **How long is the flight from Ontario (ONT) to Oakland (OAK)?** Scheduled flight times from Ontario (ONT) to Oakland (OAK) run from 1h 20m to 1h 25m across the departures in the schedule table on this page. The nonstop covers about 362 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from ONT to OAK?** Frontier Airlines is currently the only airline flying ONT to OAK nonstop. 2LNR doesn't show award or upgrade space for it on ONT to OAK, so this page carries the schedule rather than a space claim. **How many flights a week are there from ONT to OAK?** About 5 nonstop flights a week run between Ontario (ONT) and Oakland (OAK) in the current schedule, operated by Frontier Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from ONT to OAK depart?** Scheduled ONT to OAK nonstops in the next 6 days with service leave between 12:24 and 16:53, local time at Ontario. The schedule table on this page lists every departure by date, with its arrival time and aircraft. **Which flights operate ONT to OAK nonstop?** Frontier Airlines flies F9 4221 nonstop from Ontario (ONT) to Oakland (OAK), the only flight number in the schedule table on this page. The table lists each date with its departure and arrival times and aircraft. **Does 2LNR show upgrade or award space on ONT to OAK?** Not on this route: 2LNR doesn't show award or upgrade space for Frontier Airlines on ONT to OAK. The page carries the full ONT to OAK nonstop schedule and who flies each departure, and the reverse direction is linked below. Flying the other way? See [OAK to ONT nonstop flights](https://2lnr.com/routes/oak-ont.md). Award seats rather than schedules? See [award availability by airline](https://2lnr.com/awards.md). Looking beyond this route? See [every route from Ontario (ONT)](https://2lnr.com/routes/ont.md), or [every route from Oakland (OAK)](https://2lnr.com/routes/oak.md). Nonstops to Oakland (OAK) from other airports within 150 miles of Ontario (ONT): - [Burbank (BUR) to Oakland (OAK)](https://2lnr.com/routes/bur-oak.md), 45 miles from ONT - [Santa Monica (SMO) to Oakland (OAK)](https://2lnr.com/routes/smo-oak.md), 49 miles from ONT - [Carlsbad (CLD) to Oakland (OAK)](https://2lnr.com/routes/cld-oak.md), 67 miles from ONT - [San Diego (SAN) to Oakland (OAK)](https://2lnr.com/routes/san-oak.md), 94 miles from ONT Nonstops from Ontario (ONT) to other airports within 150 miles of Oakland (OAK): - [Ontario (ONT) to San Francisco (SFO)](https://2lnr.com/routes/ont-sfo.md), 11 miles from OAK - [Ontario (ONT) to Santa Rosa (STS)](https://2lnr.com/routes/ont-sts.md), 63 miles from OAK - [Ontario (ONT) to Sacramento (SMF)](https://2lnr.com/routes/ont-smf.md), 75 miles from OAK Distances are great-circle between the airports, not driving distance. - [How to plan an upgrade by route](https://2lnr.com/guides/upgrade-strategy.md) ## See the full ONT to OAK nonstop schedule Every scheduled departure on this route, with who flies it. 2LNR shows upgrade and award space by date on the carriers it tracks, the next 14 days free on every product and the full horizon on Pro. 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