Ontario to Boise flights
Routavio compares airline fares from several flight booking sites. The lowest one-way fare it found for Ontario to Boise is €70 (checked on 3 Nov 2026).
Your next trip, last seen at €70
Lowest observedWhen to fly
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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Lowest observed
- €70, departing 3 Dec 2026 (Last checked: 3 Nov 2026)One-way fare · Priced departure days checked in the last 14 days: 179Check live prices for this route
- Round trip
- €199, departing 11 Dec 2026, back 13 Dec 2026 (Last checked: 29 Oct 2026)
- Non-stop, one way
- €129, departing 25 Dec 2026 (Last checked: 3 Nov 2026)
- Airlines seen
- Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines
- Reported fastest flight
- 2h
- Non-stop
- Yes
About this route
Explore the fares we observed from Ontario to Boise. Prices move often, so pick your dates to see the latest options.
- Route distance
- 1,071 km
- Reported fastest flight
- 2h
Route-level information; individual journeys vary.
Published schedules report non-stop service with Alaska Airlines. Check current timetables.
A clearer picture of your fare
If the observed fare for this date drops, we will email you. At most one message a day.
Airport to city: straight-line distance
- Ontario International Airport (ONT) → Ontario, city gazetteer reference point (34.0500, -117.6400): ≈ 4 km.
- Boise Air Terminal/Gowen Field (BOI) → Boise, city gazetteer reference point (43.6150, -116.2023): ≈ 6 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by departure month
Cheapest month from Ontario to Boise: December 2026, from €70 (checked 3 Nov 2026).
| Month | Lowest fare | Priced days |
|---|---|---|
| November 2026 | €94 | 7 |
| December 2026 | €70 | 31 |
| January 2027 | €70 | 31 |
| February 2027 | €70 | 28 |
| March 2027 | €84 | 31 |
| April 2027 | €120 | 30 |
| May 2027 | €120 | 21 |
Lowest fare by day of the week
Cheapest day of the week from Ontario to Boise: Monday, from €70 (checked 3 Nov 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €70 | 25 |
| Tuesday | €79 | 26 |
| Wednesday | €70 | 26 |
| Thursday | €70 | 26 |
| Friday | €70 | 26 |
| Saturday | €79 | 25 |
| Sunday | €75 | 25 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from Ontario to Boise by days until departure (8 to 30 days): €70 (checked 3 Nov 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 8 to 30 days | €70 | 10 |
| 31 to 60 days | €70 | 30 |
| 61 days or more | €70 | 139 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Lowest one-way fare we saw per airline
Cheapest airline from Ontario to Boise: Frontier Airlines, from €70 (checked 3 Nov 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €70Dec 3, 2026 | 5 |
| American Airlines | €79Dec 3, 2026 | 4 |
| Southwest Airlines | €79Dec 3, 2026 | 5 |
| Alaska Airlines | €111Jan 7, 2027 | 3 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from Ontario to Boise?
The lowest fare Routavio has observed is €70, found on 3 Nov 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from Ontario to Boise?
Cheapest month from Ontario to Boise: December 2026, from €70 (checked 3 Nov 2026).
Are there direct flights from Ontario to Boise?
Yes. Published schedules report non-stop flights on this route with Alaska Airlines.
Which airlines fly from Ontario to Boise?
Routavio has seen these carriers on the route: Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines, United Airlines.
How much is a round trip from Ontario to Boise?
Cheapest round trip: €199, departing 11 Dec 2026, back 13 Dec 2026 (checked 29 Oct 2026).
How much is a non-stop flight from Ontario to Boise?
Cheapest non-stop one-way fare: €129, departing 25 Dec 2026 (checked 3 Nov 2026).
Which day of the week is cheapest from Ontario to Boise?
Cheapest day of the week from Ontario to Boise: Monday, from €70 (checked 3 Nov 2026).
Which airline has the lowest fare from Ontario to Boise?
Cheapest airline from Ontario to Boise: Frontier Airlines, from €70 (checked 3 Nov 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
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Recently observed fares. Prices may change.