$70+ Cheap flights from St. Louis (STL) to Delaware
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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ILG
May 1 — May 81
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Delaware 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
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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 St. Louis to Delaware
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Cheapest flights from St. Louis to DelawareExplore the most affordable flight options available from St. Louis to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 1, 2026.
Explore the most affordable flight options available from St. Louis to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 1, 2026.
This Expedia deal was found by Cheapflights users on 3/30. 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.
Fri 4/248:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Sun 4/265:01 am
PHL
- STL
1 stop6h 48m
Frontier
Deal found 3/30![Frontier logo]()
$140
This Expedia deal was found by Cheapflights users on 3/30. 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.
Wed 4/224:59 pm
STL
- PHL
1 stop13h 42m
Frontier
Thu 4/2310:38 pm
PHL
- STL
1 stop25h 41m
Frontier
Deal found 3/30![Frontier logo]()
$141
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/224:59 pm
STL
- PHL
1 stop17h 41m
Frontier
Sun 4/265:01 am
PHL
- STL
1 stop6h 48m
Frontier
Deal found 3/31![Frontier logo]()
$151
This Frontier deal was found by Cheapflights users on 3/31. 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.
Fri 4/178:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Tue 4/2111:48 am
PHL
- STL
1 stop12h 31m
Frontier
Deal found 3/31![Frontier logo]()
$160
This Expedia deal was found by Cheapflights users on 3/27. 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 5/238:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Mon 5/2510:11 am
PHL
- STL
1 stop15h 10m
Frontier
Deal found 3/27![Frontier logo]()
$165
This Booking.com deal was found by Cheapflights users on 3/27. 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 5/118:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Mon 5/1810:11 am
PHL
- STL
1 stop15h 10m
Frontier
Deal found 3/27![Frontier logo]()
$166
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Thu 5/149:16 pm
PHL
- STL
1 stop28h 05m
Frontier
Deal found 3/31![Frontier logo]()
$171
This Expedia deal was found by Cheapflights users on 3/29. 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.
Thu 5/284:19 pm
STL
- PHL
1 stop15h 35m
Frontier
Tue 6/29:16 pm
PHL
- STL
1 stop28h 05m
Frontier
Deal found 3/29![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 3/29. 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 4/138:19 pm
STL
- PHL
1 stop8h 12m
Frontier
Thu 5/76:10 am
PHL
- STL
1 stop9h 38m
Frontier
Deal found 3/29![Frontier logo]()
$181
This Frontier deal was found by Cheapflights users on 3/31. 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.
Wed 4/88:16 pm
STL
- PHL
1 stop8h 15m
Frontier
Thu 5/76:10 am
PHL
- STL
1 stop9h 38m
Frontier
Deal found 3/31![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Wed 5/68:35 pm
PHL
- STL
2 stops37h 20m
Frontier
Deal found 3/31![Frontier logo]()
$189
This Frontier deal was found by Cheapflights users on 3/28. 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.
Wed 6/104:10 pm
STL
- PHL
1 stop6h 33m
Frontier
Tue 6/238:30 am
PHL
- STL
1 stop10h 00m
Frontier
Deal found 3/28![Frontier logo]()
$190
Best flights from St. Louis to DelawareDiscover carefully curated flight deals from St. Louis to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 1, 2026.
Discover carefully curated flight deals from St. Louis to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 1, 2026.
This Southwest deal was found by Cheapflights users on 3/31. 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 6/36:50 pm
STL
- PHL
Nonstop2h 10m
Southwest
Thu 6/46:05 am
PHL
- STL
Nonstop2h 20m
Southwest
Deal found 3/31![Southwest logo]()
$298
This Delta deal was found by Cheapflights users on 3/29. 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 4/199:59 am
STL
- PHL
1 stop5h 12m
Delta
Wed 5/66:00 am
PHL
- STL
1 stop4h 42m
Delta
Deal found 3/29![Delta logo]()
$419
This Kiwi.com deal was found by Cheapflights users on 3/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/74:59 pm
STL
- SBY
1 stop26h 04m
Multiple Airlines
Wed 4/2211:30 am
SBY
- STL
1 stop12h 49m
Multiple Airlines
Deal found 3/30![Multiple Airlines logo]()
$435
This American Airlines deal was found by Cheapflights users on 3/30. 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.
Sun 4/57:05 am
STL
- SBY
1 stop5h 20m
American Airlines
Thu 4/231:47 pm
SBY
- STL
1 stop5h 17m
American Airlines
Deal found 3/30![American Airlines logo]()
$636
This Southwest deal was found by Cheapflights users on 3/29. 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 4/291:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Thu 4/306:10 am
PHL
- STL
Nonstop2h 25m
Southwest
Deal found 3/29![Southwest logo]()
$319
This Southwest deal was found by Cheapflights users on 3/29. 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.
Thu 5/281:35 pm
STL
- PHL
Nonstop2h 10m
Southwest
Tue 6/26:45 pm
PHL
- STL
1 stop4h 15m
Southwest
Deal found 3/29![Southwest logo]()
$329
This Southwest deal was found by Cheapflights users on 3/27. 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.
Fri 5/17:55 pm
STL
- PHL
Nonstop2h 10m
Southwest
Sat 5/26:15 am
PHL
- STL
Nonstop2h 25m
Southwest
Deal found 3/27![Southwest logo]()
$355
This Southwest deal was found by Cheapflights users on 3/28. 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.
Fri 5/157:55 pm
STL
- PHL
Nonstop2h 10m
Southwest
Tue 5/1911:35 am
PHL
- STL
1 stop4h 30m
Southwest
Deal found 3/28![Southwest logo]()
$365
This Southwest deal was found by Cheapflights users on 3/28. 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.
Thu 5/289:55 am
STL
- PHL
2 stops7h 30m
Southwest
Tue 6/97:25 am
PHL
- STL
2 stops8h 25m
Southwest
Deal found 3/28![Southwest logo]()
$421
This Southwest deal was found by Cheapflights users on 3/30. 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.
Fri 5/810:15 am
STL
- PHL
Nonstop2h 10m
Southwest
Sun 5/1012:25 pm
PHL
- STL
Nonstop2h 25m
Southwest
Deal found 3/30![Southwest logo]()
$427
This American Airlines deal was found by Cheapflights users on 3/30. 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.
Thu 4/92:12 pm
STL
- SBY
1 stop4h 58m
American Airlines
Sat 4/256:00 am
SBY
- STL
2 stops11h 00m
American Airlines
Deal found 3/30![American Airlines logo]()
$749
This Southwest deal was found by Cheapflights users on 3/31. 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 4/146:50 pm
STL
- PHL
Nonstop2h 10m
Southwest
Wed 5/66:35 pm
PHL
- STL
Nonstop2h 25m
Southwest
Deal found 3/31![Southwest logo]()
$434
This American Airlines deal was found by Cheapflights users on 3/30. 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 4/112:12 pm
STL
- SBY
1 stop4h 58m
American Airlines
Thu 4/231:47 pm
SBY
- STL
2 stops10h 59m
American Airlines
Deal found 3/30![American Airlines logo]()
$752
This Southwest deal was found by Cheapflights users on 3/29. 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.
Thu 4/1610:15 am
STL
- PHL
Nonstop2h 10m
Southwest
Thu 5/77:10 pm
PHL
- STL
Nonstop2h 40m
Southwest
Deal found 3/29![Southwest logo]()
$455
This American Airlines deal was found by Cheapflights users on 3/30. 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 4/112:12 pm
STL
- SBY
1 stop4h 58m
American Airlines
Sun 4/196:00 am
SBY
- STL
2 stops11h 00m
American Airlines
Deal found 3/30![American Airlines logo]()
$841
This American Airlines deal was found by Cheapflights users on 3/30. 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.
Mon 4/69:15 am
STL
- SBY
1 stop5h 46m
American Airlines
Mon 4/206:00 am
SBY
- STL
2 stops18h 46m
American Airlines
Deal found 3/30![American Airlines logo]()
$868
This American Airlines deal was found by Cheapflights users on 3/31. 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 5/275:14 am
STL
- SBY
1 stop4h 48m
American Airlines
Thu 5/287:40 am
SBY
- STL
1 stop5h 19m
American Airlines
Deal found 3/31![American Airlines logo]()
$920
This American Airlines deal was found by Cheapflights users on 3/28. 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.
Sun 4/127:00 am
STL
- SBY
1 stop5h 21m
American Airlines
Thu 4/161:47 pm
SBY
- STL
1 stop6h 43m
American Airlines
Deal found 3/28![American Airlines logo]()
$990
Last-minute flights from St. Louis to DelawareDiscover last-minute flight deals from St. Louis to Delaware. Data last updated April 1, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Delaware. Data last updated April 1, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/31. 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.
Wed 4/88:16 pm
STL
- PHL
1 stop8h 15m
Frontier
Thu 5/76:10 am
PHL
- STL
1 stop9h 38m
Frontier
Deal found 3/31![Frontier logo]()
$182
This CheapOair deal was found by Cheapflights users on 3/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/84:59 pm
STL
- PHL
1 stop13h 42m
Frontier
Wed 4/227:56 pm
PHL
- STL
1 stop28h 23m
Frontier
Deal found 3/30![Frontier logo]()
$192
This Expedia deal was found by Cheapflights users on 3/30. 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.
Mon 4/138:19 pm
STL
- PHL
1 stop8h 12m
Frontier
Thu 4/166:43 am
PHL
- STL
1 stop15h 17m
Frontier
Deal found 3/30![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 3/29. 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 4/138:19 pm
STL
- PHL
1 stop8h 12m
Frontier
Thu 5/76:10 am
PHL
- STL
1 stop9h 38m
Frontier
Deal found 3/29![Frontier logo]()
$181
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:59 pm
STL
- PHL
1 stop16h 54m
Frontier
Wed 5/610:40 am
PHL
- STL
1 stop25h 41m
Frontier
Deal found 3/31![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Wed 5/68:35 pm
PHL
- STL
1 stop23h 48m
Frontier
Deal found 3/29![Frontier logo]()
$197
This Frontier deal was found by Cheapflights users on 3/31. 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.
Fri 4/178:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Tue 4/2111:48 am
PHL
- STL
1 stop12h 31m
Frontier
Deal found 3/31![Frontier logo]()
$160
This Expedia deal was found by Cheapflights users on 3/30. 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.
Wed 4/224:59 pm
STL
- PHL
1 stop13h 42m
Frontier
Thu 4/2310:38 pm
PHL
- STL
1 stop25h 41m
Frontier
Deal found 3/30![Frontier logo]()
$141
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/224:59 pm
STL
- PHL
1 stop17h 41m
Frontier
Sun 4/265:01 am
PHL
- STL
1 stop6h 48m
Frontier
Deal found 3/31![Frontier logo]()
$151
This Expedia deal was found by Cheapflights users on 3/30. 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.
Fri 4/248:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Sun 4/265:01 am
PHL
- STL
1 stop6h 48m
Frontier
Deal found 3/30![Frontier logo]()
$140
This Booking.com deal was found by Cheapflights users on 3/27. 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 4/269:55 pm
STL
- PHL
1 stop31h 55m
Frontier
Sun 5/38:36 pm
PHL
- STL
1 stop23h 56m
Frontier
Deal found 3/27![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Wed 5/68:35 pm
PHL
- STL
2 stops37h 20m
Frontier
Deal found 3/31![Frontier logo]()
$189
One-way flights from St. Louis to DelawareSearch for one-way flight options from St. Louis to Delaware. Find affordable one-way fares based on user searches. Data last updated April 1, 2026.
Search for one-way flight options from St. Louis to Delaware. Find affordable one-way fares based on user searches. Data last updated April 1, 2026.
This Frontier deal was found by Cheapflights users on 3/31. 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.
Sat 5/98:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Deal found 3/31![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 3/31. 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.
Wed 4/298:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Deal found 3/31![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Deal found 4/1![Frontier logo]()
$79
This Priceline deal was found by Cheapflights users on 3/31. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/298:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Deal found 3/31![Frontier logo]()
$90
This Trip.com deal was found by Cheapflights users on 3/31. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:06 pm
STL
- PHL
1 stop8h 28m
Frontier
Deal found 3/31![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Deal found 3/29![Frontier logo]()
$95
This Expedia deal was found by Cheapflights users on 3/27. 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.
Tue 4/144:59 pm
STL
- PHL
1 stop22h 35m
Frontier
Deal found 3/27![Frontier logo]()
$96
This Expedia deal was found by Cheapflights users on 3/31. 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.
Tue 6/304:10 pm
STL
- PHL
1 stop15h 46m
Frontier
Deal found 3/31![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:21 am
STL
- PHL
1 stop19h 49m
Frontier
Deal found 3/31![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 3/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:23 pm
STL
- PHL
2 stops23h 17m
Frontier
Deal found 3/30![Frontier logo]()
$109
This Super.com deal was found by Cheapflights users on 3/31. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:21 am
STL
- PHL
1 stop5h 33m
Frontier
Deal found 3/31![Frontier logo]()
$110
Find flight deals from St. Louis to Delaware
Keep the following information in mind while searching for St. Louis to Delaware flight deals. Data was last updated April 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $140 (Expedia) |
One-way from | $70 (Frontier) |
Popular in | November |
Cheapest in | August |
Average price | $407 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Delaware 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 April 1, 2026.
Use the filters below to find and compare flights from St. Louis to Delaware that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Wed 6/3
6:50 pm-10:00 pm
Nonstop2h 10m
Philadelphia
Thu 6/4
6:05 am-7:25 am
Nonstop2h 20m
$298
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Wed 4/29
1:40 pm-4:50 pm
Nonstop2h 10m
Philadelphia
Thu 4/30
6:10 am-7:35 am
Nonstop2h 25m
$319
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Thu 5/28
1:35 pm-4:45 pm
Nonstop2h 10m
Philadelphia
Tue 6/2
6:45 pm-10:00 pm
1 stop4h 15m
$329
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Fri 5/1
7:55 pm-11:05 pm
Nonstop2h 10m
Philadelphia
Sat 5/2
6:15 am-7:40 am
Nonstop2h 25m
$355
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Fri 5/15
7:55 pm-11:05 pm
Nonstop2h 10m
Philadelphia
Tue 5/19
11:35 am-3:05 pm
1 stop4h 30m
$365
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Sun 4/19
9:59 am-4:11 pm
1 stop5h 12m
Philadelphia
Wed 5/6
6:00 am-9:42 am
1 stop4h 42m
$419
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Thu 5/28
9:55 am-6:25 pm
2 stops7h 30m
Philadelphia
Tue 6/9
7:25 am-2:50 pm
2 stops8h 25m
$421
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Fri 5/8
10:15 am-1:25 pm
Nonstop2h 10m
Philadelphia
Sun 5/10
12:25 pm-1:50 pm
Nonstop2h 25m
$427
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Tue 4/14
6:50 pm-10:00 pm
Nonstop2h 10m
Philadelphia
Wed 5/6
6:35 pm-8:00 pm
Nonstop2h 25m
$434
St. LouisSalisbury
STL - SBY
STLSBY
Lambert-St Louis
Tue 4/7
4:59 pm-8:03 pm
1 stop26h 04m
Salisbury-Ocean City
Wed 4/22
11:30 am-11:19 pm
1 stop12h 49m
$435
Showing 1-10 of 27 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Delaware
Have a flexible travel schedule? Discover the best time to fly to Delaware from St. Louis with our price prediction graph.
STL-PHL
STL-SBY
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 St. Louis to Delaware
STL-USDE
STL-PHL
STL-SBY
No data available for this route at this time. Please check back soon.
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