Your next trip, last seen at €104
Lowest observedFrontier Airlines · 1 stop · One wayWhen 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
- €104, departing 3 Dec 2026 (Last checked: 23 Oct 2026)One-way fare · Priced departure days checked in the last 14 days: 85Check live prices for this route
- Airlines seen
- United Airlines, Alaska Airlines, Allegiant Air, Frontier Airlines
- Typical journey time
- 7h 35m
- Non-stop
- Yes
About this route
Explore the fares we observed from Chicago to Boise. Prices move often, so pick your dates to see the latest options.
- Route distance
- 2,330 km
- Typical journey time
- 7h 35m
- Alternative airports
- CGX, DPA, MDW, PWK, RFD
Route-level information; individual journeys vary.
Published schedules report non-stop service with United Airlines. Check current timetables.
A clearer picture of your fare
Airport to city: straight-line distance
- Chicago Midway International Airport (MDW) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 14 km.
- Chicago O'Hare International Airport (ORD) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 25 km.
- Chicago Rockford International Airport (RFD) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 126 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 Chicago to Boise: December 2026, from €104 (checked 23 Oct 2026).
| Month | Lowest fare | Priced days |
|---|---|---|
| October 2026 | €216 | 3 |
| November 2026 | €138 | 29 |
| December 2026 | €104 | 30 |
| January 2027 | €105 | 23 |
Lowest fare by day of the week
Cheapest day of the week from Chicago to Boise: Thursday, from €104 (checked 23 Oct 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €105 | 12 |
| Tuesday | €128 | 12 |
| Wednesday | €112 | 12 |
| Thursday | €104 | 13 |
| Friday | €153 | 13 |
| Saturday | €142 | 12 |
| Sunday | €157 | 11 |
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 Chicago to Boise by days until departure (31 to 60 days): €104 (checked 23 Oct 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 0 to 7 days | €168 | 8 |
| 8 to 30 days | €138 | 22 |
| 31 to 60 days | €104 | 29 |
| 61 days or more | €105 | 26 |
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 Chicago to Boise: Frontier Airlines, from €104 (checked 23 Oct 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €104Dec 3, 2026 | 20 |
| Alaska Airlines | €156Nov 12, 2026 | 63 |
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 Chicago to Boise?
The lowest fare Routavio has observed is €104, found on 23 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from Chicago to Boise?
Cheapest month from Chicago to Boise: December 2026, from €104 (checked 23 Oct 2026).
Are there direct flights from Chicago to Boise?
Yes. Published schedules report non-stop flights on this route with United Airlines.
Which airlines fly from Chicago to Boise?
Routavio has seen these carriers on the route: United Airlines, Alaska Airlines, Allegiant Air, Frontier Airlines.
How long does the flight from Chicago to Boise take?
Across the 90 fares Routavio observed, the average journey time is 12h 03m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
Which day of the week is cheapest from Chicago to Boise?
Cheapest day of the week from Chicago to Boise: Thursday, from €104 (checked 23 Oct 2026).
Which airline has the lowest fare from Chicago to Boise?
Cheapest airline from Chicago to Boise: Frontier Airlines, from €104 (checked 23 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
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Recently observed fares. Prices may change.
Last checked: 23 Oct 2026