$111+ Cheap flights from Philadelphia (PHL) to Idaho
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — BOI
Jun 9 — Jun 161
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Philadelphia to Idaho with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Philadelphia to Idaho
Cheapest
Best
Last-minute
One-way
Cheapest flights from Philadelphia to IdahoExplore the most affordable flight options available from Philadelphia to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 10, 2026.
Explore the most affordable flight options available from Philadelphia to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 10, 2026.
This Frontier deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:35 pm
PHL
- GEG
1 stop18h 03m
Frontier
Wed 6/1012:31 pm
GEG
- PHL
1 stop20h 16m
Frontier
Deal found 5/10![Frontier logo]()
$226
This Booking.com deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/18:35 pm
PHL
- BOI
1 stop17h 55m
Frontier
Tue 6/91:25 pm
BOI
- PHL
1 stop20h 22m
Frontier
Deal found 5/6![Frontier logo]()
$237
This Frontier deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/18:35 pm
PHL
- BOI
1 stop17h 55m
Frontier
Sun 6/71:33 pm
BOI
- PHL
1 stop14h 04m
Frontier
Deal found 5/10![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/248:35 pm
PHL
- GEG
1 stop18h 03m
Frontier
Mon 6/112:33 pm
GEG
- PHL
1 stop14h 04m
Frontier
Deal found 5/6![Frontier logo]()
$261
This Booking.com deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:35 pm
PHL
- GEG
1 stop18h 03m
Frontier
Mon 6/812:33 pm
GEG
- PHL
1 stop20h 14m
Frontier
Deal found 5/9![Frontier logo]()
$262
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:15 am
PHL
- GEG
1 stop9h 52m
Delta
Tue 9/82:05 pm
GEG
- PHL
1 stop6h 35m
Delta
Deal found 5/6![Delta logo]()
$279
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
PHL
- BOI
1 stop8h 49m
Delta
Sat 8/295:10 am
BOI
- PHL
1 stop9h 17m
Delta
Deal found 5/9![Delta logo]()
$279
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:31 pm
PHL
- GEG
2 stops11h 38m
Delta
Tue 9/85:40 pm
GEG
- PHL
1 stop9h 25m
Delta
Deal found 5/6![Delta logo]()
$284
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:57 pm
PHL
- GEG
1 stop7h 09m
Delta
Tue 7/284:30 pm
GEG
- PHL
1 stop9h 59m
Delta
Deal found 5/8![Delta logo]()
$289
This Delta deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:05 am
PHL
- BOI
1 stop9h 17m
Delta
Sat 9/193:25 pm
BOI
- PHL
1 stop6h 15m
Delta
Deal found 5/7![Delta logo]()
$289
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/245:45 am
PHL
- GEG
2 stops12h 46m
Delta
Mon 6/17:23 pm
GEG
- PHL
2 stops12h 07m
Delta
Deal found 5/6![Delta logo]()
$290
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/812:36 pm
PHL
- GEG
2 stops13h 30m
Delta
Thu 7/304:30 pm
GEG
- PHL
2 stops10h 45m
Delta
Deal found 5/8![Delta logo]()
$300
Best flights from Philadelphia to IdahoDiscover carefully curated flight deals from Philadelphia to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 10, 2026.
Discover carefully curated flight deals from Philadelphia to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 10, 2026.
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:15 am
PHL
- GEG
1 stop9h 25m
Delta
Tue 7/284:30 pm
GEG
- PHL
1 stop9h 59m
Delta
Deal found 5/9![Delta logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/224:44 pm
PHL
- GEG
1 stop9h 30m
Alaska Airlines
Wed 9/235:09 am
GEG
- PHL
1 stop7h 35m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$312
This Southwest deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:35 pm
PHL
- BOI
2 stops9h 50m
Southwest
Tue 7/144:05 pm
BOI
- PHL
1 stop6h 55m
Southwest
Deal found 5/7![Southwest logo]()
$350
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/291:31 pm
PHL
- JAC
1 stop7h 11m
United Airlines
Mon 6/11:42 pm
JAC
- PHL
2 stops9h 17m
United Airlines
Deal found 5/5![United Airlines logo]()
$424
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1912:04 pm
PHL
- IDA
2 stops11h 16m
American Airlines
Tue 8/257:00 am
IDA
- PHL
1 stop9h 48m
American Airlines
Deal found 5/10![American Airlines logo]()
$510
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:57 pm
PHL
- BOI
1 stop6h 49m
Delta
Mon 8/36:44 pm
BOI
- PHL
1 stop9h 21m
Delta
Deal found 5/6![Delta logo]()
$279
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:01 pm
PHL
- GEG
1 stop7h 05m
Delta
Mon 6/85:10 pm
GEG
- PHL
2 stops13h 24m
Delta
Deal found 5/9![Delta logo]()
$284
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:15 am
PHL
- GEG
2 stops13h 53m
Delta
Thu 7/3010:48 pm
GEG
- PHL
1 stop7h 43m
Delta
Deal found 5/8![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:40 pm
PHL
- GEG
1 stop7h 55m
Delta
Sat 10/37:00 am
GEG
- PHL
2 stops14h 27m
Delta
Deal found 5/7![Delta logo]()
$294
This Alaska Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/224:44 pm
PHL
- IDA
1 stop22h 22m
Alaska Airlines
Fri 8/284:14 pm
IDA
- PHL
1 stop21h 30m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/174:35 pm
PHL
- BOI
2 stops9h 55m
Southwest
Wed 6/244:05 pm
BOI
- PHL
1 stop6h 55m
Southwest
Deal found 5/5![Southwest logo]()
$404
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/116:00 am
PHL
- GEG
2 stops10h 21m
Delta
Tue 7/284:30 pm
GEG
- PHL
1 stop9h 59m
Delta
Deal found 5/8![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/117:05 am
PHL
- GEG
1 stop8h 57m
Delta
Sat 9/195:40 pm
GEG
- PHL
1 stop9h 25m
Delta
Deal found 5/6![Delta logo]()
$312
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/38:00 am
PHL
- JAC
1 stop9h 12m
United Airlines
Wed 10/71:45 pm
JAC
- PHL
2 stops8h 52m
United Airlines
Deal found 5/6![United Airlines logo]()
$504
This Alaska Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:39 pm
PHL
- SUN
1 stop18h 32m
Alaska Airlines
Mon 10/1911:53 am
SUN
- PHL
1 stop15h 47m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$485
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:15 am
PHL
- GEG
1 stop9h 13m
Delta
Wed 8/125:39 pm
GEG
- PHL
1 stop9h 01m
Delta
Deal found 5/9![Delta logo]()
$317
This United Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:25 am
PHL
- IDA
1 stop7h 27m
United Airlines
Fri 8/282:25 pm
IDA
- PHL
1 stop7h 20m
United Airlines
Deal found 5/9![United Airlines logo]()
$514
This Alaska Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/134:44 pm
PHL
- IDA
2 stops32h 12m
Alaska Airlines
Fri 9/254:14 pm
IDA
- PHL
1 stop21h 30m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$492
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/45:15 am
PHL
- GEG
2 stops13h 54m
Delta
Fri 8/145:14 pm
GEG
- PHL
1 stop9h 51m
Delta
Deal found 5/6![Delta logo]()
$317
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/89:52 am
PHL
- JAC
2 stops10h 00m
United Airlines
Fri 9/189:45 am
JAC
- PHL
1 stop9h 17m
United Airlines
Deal found 5/6![United Airlines logo]()
$532
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/125:40 am
PHL
- GEG
1 stop8h 59m
Delta
Wed 7/297:00 am
GEG
- PHL
1 stop8h 04m
Delta
Deal found 5/8![Delta logo]()
$324
This United Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2911:38 am
PHL
- JAC
1 stop9h 04m
United Airlines
Wed 8/58:00 am
JAC
- PHL
2 stops14h 57m
United Airlines
Deal found 5/8![United Airlines logo]()
$532
This Alaska Airlines deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:00 am
PHL
- IDA
1 stop10h 37m
Alaska Airlines
Mon 9/76:18 am
IDA
- PHL
1 stop21h 22m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$547
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:45 pm
PHL
- BOI
1 stop7h 19m
Delta
Tue 6/95:30 am
BOI
- PHL
2 stops11h 50m
Delta
Deal found 5/6![Delta logo]()
$324
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2910:00 am
PHL
- WYS
1 stop8h 07m
United Airlines
Tue 9/12:02 pm
WYS
- PHL
1 stop7h 35m
United Airlines
Deal found 5/5![United Airlines logo]()
$533
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/52:23 pm
PHL
- BOI
1 stop10h 05m
Delta
Tue 6/96:43 am
BOI
- PHL
1 stop8h 52m
Delta
Deal found 5/9![Delta logo]()
$327
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:00 am
PHL
- IDA
1 stop7h 24m
United Airlines
Sat 9/510:35 am
IDA
- PHL
2 stops12h 15m
United Airlines
Deal found 5/5![United Airlines logo]()
$545
This Alaska Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/87:00 am
PHL
- SUN
1 stop30h 11m
Alaska Airlines
Mon 10/1911:53 am
SUN
- PHL
1 stop15h 47m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$638
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/195:40 am
PHL
- BOI
1 stop7h 17m
Delta
Thu 7/2311:53 am
BOI
- PHL
2 stops10h 03m
Delta
Deal found 5/5![Delta logo]()
$332
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/304:14 pm
PHL
- SUN
1 stop7h 12m
United Airlines
Tue 6/28:00 am
SUN
- PHL
2 stops13h 44m
United Airlines
Deal found 5/5![United Airlines logo]()
$546
Last-minute flights from Philadelphia to IdahoDiscover last-minute flight deals from Philadelphia to Idaho. Data last updated May 10, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Idaho. Data last updated May 10, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/208:35 pm
PHL
- BOI
1 stop17h 55m
Frontier
Tue 5/261:25 pm
BOI
- PHL
1 stop14h 12m
Frontier
Deal found 5/10![Frontier logo]()
$314
This Frontier deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/248:35 pm
PHL
- GEG
1 stop18h 03m
Frontier
Mon 6/112:33 pm
GEG
- PHL
1 stop14h 04m
Frontier
Deal found 5/6![Frontier logo]()
$261
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:25 am
PHL
- GEG
1 stop7h 36m
Delta
Mon 6/15:39 pm
GEG
- PHL
1 stop8h 56m
Delta
Deal found 5/9![Delta logo]()
$279
This Booking.com deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/18:35 pm
PHL
- BOI
1 stop17h 55m
Frontier
Tue 6/91:25 pm
BOI
- PHL
1 stop20h 22m
Frontier
Deal found 5/6![Frontier logo]()
$237
This Frontier deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/18:35 pm
PHL
- BOI
1 stop17h 55m
Frontier
Sun 6/71:33 pm
BOI
- PHL
1 stop14h 04m
Frontier
Deal found 5/10![Frontier logo]()
$246
This Booking.com deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:35 pm
PHL
- GEG
1 stop18h 03m
Frontier
Mon 6/812:33 pm
GEG
- PHL
1 stop20h 14m
Frontier
Deal found 5/9![Frontier logo]()
$262
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:10 am
PHL
- GEG
1 stop8h 01m
Delta
Mon 6/85:37 pm
GEG
- PHL
2 stops9h 31m
Delta
Deal found 5/8![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:01 pm
PHL
- BOI
1 stop7h 47m
Delta
Wed 6/106:43 am
BOI
- PHL
1 stop8h 52m
Delta
Deal found 5/6![Delta logo]()
$279
This Frontier deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:35 pm
PHL
- GEG
1 stop18h 03m
Frontier
Wed 6/1012:31 pm
GEG
- PHL
1 stop20h 16m
Frontier
Deal found 5/10![Frontier logo]()
$226
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/44:06 pm
PHL
- BOI
1 stop8h 22m
Delta
Sat 6/61:53 pm
BOI
- PHL
1 stop9h 04m
Delta
Deal found 5/5![Delta logo]()
$319
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:01 pm
PHL
- GEG
1 stop7h 05m
Delta
Mon 6/810:48 pm
GEG
- PHL
1 stop7h 46m
Delta
Deal found 5/6![Delta logo]()
$312
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/204:17 pm
PHL
- GEG
1 stop9h 52m
American Airlines
Thu 7/22:29 pm
GEG
- PHL
1 stop7h 30m
American Airlines
Deal found 5/10![American Airlines logo]()
$313
One-way flights from Philadelphia to IdahoSearch for one-way flight options from Philadelphia to Idaho. Find affordable one-way fares based on user searches. Data last updated May 10, 2026.
Search for one-way flight options from Philadelphia to Idaho. Find affordable one-way fares based on user searches. Data last updated May 10, 2026.
This Booking.com deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/38:35 pm
PHL
- BOI
1 stop18h 03m
Frontier
Deal found 5/6![Frontier logo]()
$111
This Mytrip deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/88:35 pm
PHL
- BOI
1 stop17h 55m
Frontier
Deal found 5/6![Frontier logo]()
$125
This Mytrip deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/238:37 pm
PHL
- GEG
1 stop18h 00m
Frontier
Deal found 5/9![Frontier logo]()
$135
This Booking.com deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/28:37 pm
PHL
- GEG
1 stop18h 00m
Frontier
Deal found 5/8![Frontier logo]()
$136
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/134:50 pm
PHL
- GEG
1 stop8h 10m
Southwest
Deal found 5/6![Southwest logo]()
$140
This American Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:45 am
PHL
- BOI
1 stop9h 04m
American Airlines
Deal found 5/6![American Airlines logo]()
$140
This Southwest deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/134:50 pm
PHL
- BOI
2 stops9h 35m
Southwest
Deal found 5/7![Southwest logo]()
$145
This Delta deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:10 am
PHL
- GEG
2 stops8h 29m
Delta
Deal found 5/7![Delta logo]()
$150
This Delta deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/295:15 am
PHL
- BOI
2 stops10h 36m
Delta
Deal found 5/7![Delta logo]()
$150
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/242:31 pm
PHL
- JAC
1 stop7h 40m
Delta
Deal found 5/9![Delta logo]()
$156
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:30 am
PHL
- BOI
2 stops11h 55m
United Airlines
Deal found 5/5![United Airlines logo]()
$165
This Expedia deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/307:00 am
PHL
- IDA
1 stop10h 26m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$175
Find flight deals from Philadelphia to Idaho
Keep the following information in mind while searching for Philadelphia to Idaho flight deals. Data was last updated May 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $237 (Booking.com) |
One-way from | $111 (Booking.com) |
Popular in | June |
Cheapest in | September |
Average price | $436 |
Cheapflights Fare Finder
Customize your flight search to find flights from Philadelphia to Idaho that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 10, 2026.
Use the filters below to find and compare flights from Philadelphia to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Tue 7/21
5:15 am-11:40 am
1 stop9h 25m
Spokane
Tue 7/28
4:30 pm-5:29 am
1 stop9h 59m
$279
PhiladelphiaBoise
PHL - BOI
PHLBOI
Philadelphia
Wed 7/29
6:57 pm-11:46 pm
1 stop6h 49m
Boise Air Term. Gowen Fld
Mon 8/3
6:44 pm-6:05 am
1 stop9h 21m
$279
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Tue 6/2
7:01 pm-11:06 pm
1 stop7h 05m
Spokane
Mon 6/8
5:10 pm-9:34 am
2 stops13h 24m
$284
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Tue 7/14
5:15 am-4:08 pm
2 stops13h 53m
Spokane
Thu 7/30
10:48 pm-9:31 am
1 stop7h 43m
$294
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Mon 9/21
6:40 pm-11:35 pm
1 stop7h 55m
Spokane
Sat 10/3
7:00 am-12:27 am
2 stops14h 27m
$294
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Sat 7/11
6:00 am-1:21 pm
2 stops10h 21m
Spokane
Tue 7/28
4:30 pm-5:29 am
1 stop9h 59m
$294
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Tue 9/22
4:44 pm-11:14 pm
1 stop9h 30m
Spokane
Wed 9/23
5:09 am-3:44 pm
1 stop7h 35m
$312
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Fri 9/11
7:05 am-1:02 pm
1 stop8h 57m
Spokane
Sat 9/19
5:40 pm-6:05 am
1 stop9h 25m
$312
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Wed 8/5
5:15 am-11:28 am
1 stop9h 13m
Spokane
Wed 8/12
5:39 pm-5:40 am
1 stop9h 01m
$317
PhiladelphiaSpokane
PHL - GEG
PHLGEG
Philadelphia
Tue 8/4
5:15 am-4:09 pm
2 stops13h 54m
Spokane
Fri 8/14
5:14 pm-6:05 am
1 stop9h 51m
$317
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Philadelphia to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Philadelphia with our price prediction graph.
PHL-GEG
PHL-BOI
PHL-JAC
PHL-IDA
PHL-SUN
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Philadelphia to Idaho
PHL-USID
PHL-GEG
PHL-BOI
PHL-JAC
PHL-IDA
How far ahead should I book a flight from Philadelphia to Idaho?
The price you pay for your flight from Philadelphia to Idaho may vary depending on when you book. For the best chance of a lower fare, look to book 41 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Philadelphia to Idaho?
Currently, August is the cheapest month in which you can book a flight from Philadelphia to Idaho (average of $131). Flying from Philadelphia to Idaho in December is currently the most expensive (average of $446). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Philadelphia to Idaho?
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated May 10, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from Philadelphia to Idaho to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from Philadelphia to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Philadelphia to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Philadelphia to Idaho by cabin class
Find flights from Philadelphia to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Philadelphia and Idaho flights
Browse other Philadelphia and Idaho flight options. Last updated on May 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Philadelphia to Idaho flights
Consider these flights traveling from Philadelphia to Idaho.
Top 4 airlines flying from Philadelphia to Idaho
Discover the top 4 airlines that operate flights from Philadelphia to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$175 | Average$494 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$283 | Average$487 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$336 | Average$583 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$371 | Average$486 | FlexibilityNo cancel fee | On-time63% |