$81+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ILG
Jun 24 — Jul 11
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 May 25, 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 May 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/225:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Fri 6/264:40 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 5/20![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/175:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Fri 6/191:32 pm
PHL
- STL
1 stop20h 20m
Frontier
Deal found 5/20![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/96:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Sun 6/146:30 am
PHL
- STL
1 stop27h 22m
Frontier
Deal found 5/20![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/236:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Thu 6/258:30 am
PHL
- STL
1 stop10h 00m
Frontier
Deal found 5/20![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/256:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Sun 6/286:30 am
PHL
- STL
1 stop27h 22m
Frontier
Deal found 5/20![Frontier logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Fri 6/265:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Sun 6/286:30 am
PHL
- STL
1 stop27h 22m
Frontier
Deal found 5/21![Frontier logo]()
$193
This Trip.com deal was found by Cheapflights users on 5/20. 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.
Wed 7/84:09 pm
STL
- PHL
1 stop6h 35m
Frontier
Thu 7/96:30 am
PHL
- STL
1 stop12h 07m
Frontier
Deal found 5/20![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/238:08 pm
STL
- PHL
2 stops25h 21m
Frontier
Fri 6/264:40 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 5/20![Frontier logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/245:06 pm
STL
- PHL
2 stops30h 38m
Frontier
Sun 6/288:30 am
PHL
- STL
1 stop10h 00m
Frontier
Deal found 5/20![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Fri 6/125:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Mon 6/154:40 pm
PHL
- STL
1 stop25h 50m
Frontier
Deal found 5/21![Frontier logo]()
$226
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/96:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Wed 6/104:35 pm
PHL
- STL
1 stop25h 55m
Frontier
Deal found 5/20![Frontier logo]()
$228
This American Airlines deal was found by Cheapflights users on 5/22. 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 6/65:40 pm
STL
- SBY
1 stop4h 30m
American Airlines
Wed 6/107:40 am
SBY
- STL
1 stop5h 19m
American Airlines
Deal found 5/22![American Airlines logo]()
$532
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 May 25, 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 May 25, 2026.
This Southwest deal was found by Cheapflights users on 5/20. 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 7/85:40 am
STL
- PHL
1 stop4h 10m
Southwest
Wed 7/85:05 pm
PHL
- STL
Nonstop2h 35m
Southwest
Deal found 5/20![Southwest logo]()
$287
This American Airlines deal was found by Cheapflights users on 5/20. 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.
Fri 7/105:10 am
STL
- SBY
1 stop4h 48m
American Airlines
Sun 7/126:41 am
SBY
- STL
1 stop4h 54m
American Airlines
Deal found 5/20![American Airlines logo]()
$558
This Southwest deal was found by Cheapflights users on 5/24. 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 8/192:50 pm
STL
- PHL
2 stops8h 00m
Southwest
Mon 8/2410:20 am
PHL
- STL
2 stops8h 35m
Southwest
Deal found 5/24![Southwest logo]()
$328
This Southwest deal was found by Cheapflights users on 5/24. 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.
Mon 6/228:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Wed 7/155:05 pm
PHL
- STL
Nonstop2h 35m
Southwest
Deal found 5/24![Southwest logo]()
$378
This Southwest deal was found by Cheapflights users on 5/21. 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.
Sun 6/285:50 am
STL
- PHL
1 stop5h 15m
Southwest
Wed 7/16:20 am
PHL
- STL
Nonstop2h 20m
Southwest
Deal found 5/21![Southwest logo]()
$388
This Southwest deal was found by Cheapflights users on 5/23. 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 6/187:15 pm
STL
- PHL
1 stop4h 05m
Southwest
Tue 6/235:05 pm
PHL
- STL
Nonstop2h 35m
Southwest
Deal found 5/23![Southwest logo]()
$388
This American Airlines deal was found by Cheapflights users on 5/23. 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 8/279:21 am
STL
- SBY
1 stop5h 54m
American Airlines
Sun 8/306:41 am
SBY
- STL
1 stop5h 01m
American Airlines
Deal found 5/23![American Airlines logo]()
$558
This Southwest deal was found by Cheapflights users on 5/24. 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 7/23:35 pm
STL
- PHL
2 stops7h 45m
Southwest
Tue 7/74:35 pm
PHL
- STL
1 stop6h 55m
Southwest
Deal found 5/24![Southwest logo]()
$395
This American Airlines deal was found by Cheapflights users on 5/20. 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.
Fri 6/265:40 pm
STL
- SBY
1 stop4h 30m
American Airlines
Sun 6/286:40 am
SBY
- STL
1 stop4h 57m
American Airlines
Deal found 5/20![American Airlines logo]()
$558
This Southwest deal was found by Cheapflights users on 5/24. 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.
Mon 6/228:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Fri 7/176:00 pm
PHL
- STL
Nonstop2h 30m
Southwest
Deal found 5/24![Southwest logo]()
$471
This American Airlines deal was found by Cheapflights users on 5/22. 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.
Fri 6/1912:39 pm
STL
- SBY
1 stop6h 51m
American Airlines
Fri 6/266:40 am
SBY
- STL
1 stop4h 57m
American Airlines
Deal found 5/22![American Airlines logo]()
$657
This Southwest deal was found by Cheapflights users on 5/22. 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 6/201:00 pm
STL
- PHL
Nonstop2h 10m
Southwest
Thu 6/258:00 am
PHL
- STL
1 stop7h 10m
Southwest
Deal found 5/22![Southwest logo]()
$473
This Southwest deal was found by Cheapflights users on 5/21. 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 6/268:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Sun 6/287:55 am
PHL
- STL
1 stop4h 25m
Southwest
Deal found 5/21![Southwest logo]()
$481
This American Airlines deal was found by Cheapflights users on 5/20. 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 6/185:40 pm
STL
- SBY
1 stop4h 30m
American Airlines
Sun 6/216:40 am
SBY
- STL
1 stop4h 57m
American Airlines
Deal found 5/20![American Airlines logo]()
$715
This Southwest deal was found by Cheapflights users on 5/21. 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 6/258:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Sun 7/125:30 pm
PHL
- STL
1 stop7h 15m
Southwest
Deal found 5/21![Southwest logo]()
$481
This American Airlines deal was found by Cheapflights users on 5/22. 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 7/65:48 pm
STL
- SBY
1 stop4h 10m
American Airlines
Mon 7/134:33 pm
SBY
- STL
1 stop4h 31m
American Airlines
Deal found 5/22![American Airlines logo]()
$715
This American Airlines deal was found by Cheapflights users on 5/22. 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 6/65:40 pm
STL
- SBY
1 stop4h 30m
American Airlines
Wed 6/106:40 am
SBY
- STL
2 stops10h 53m
American Airlines
Deal found 5/22![American Airlines logo]()
$839
This American Airlines deal was found by Cheapflights users on 5/20. 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.
Fri 6/195:40 pm
STL
- SBY
1 stop4h 30m
American Airlines
Sun 6/216:00 am
SBY
- STL
2 stops9h 00m
American Airlines
Deal found 5/20![American Airlines logo]()
$993
Last-minute flights from St. Louis to DelawareDiscover last-minute flight deals from St. Louis to Delaware. Data last updated May 25, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Delaware. Data last updated May 25, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 5/22. 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 6/65:40 pm
STL
- SBY
1 stop4h 30m
American Airlines
Wed 6/107:40 am
SBY
- STL
1 stop5h 19m
American Airlines
Deal found 5/22![American Airlines logo]()
$532
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/96:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Sun 6/146:30 am
PHL
- STL
1 stop27h 22m
Frontier
Deal found 5/20![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/96:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Wed 6/104:35 pm
PHL
- STL
1 stop25h 55m
Frontier
Deal found 5/20![Frontier logo]()
$228
This Frontier deal was found by Cheapflights users on 5/20. 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 6/107:03 pm
STL
- PHL
1 stop10h 24m
Frontier
Tue 6/236:30 am
PHL
- STL
1 stop12h 00m
Frontier
Deal found 5/20![Frontier logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Fri 6/125:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Mon 6/154:40 pm
PHL
- STL
1 stop25h 50m
Frontier
Deal found 5/21![Frontier logo]()
$226
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/175:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Fri 6/191:32 pm
PHL
- STL
1 stop20h 20m
Frontier
Deal found 5/20![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/225:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Fri 6/264:40 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 5/20![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/236:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Thu 6/258:30 am
PHL
- STL
1 stop10h 00m
Frontier
Deal found 5/20![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/238:08 pm
STL
- PHL
2 stops25h 21m
Frontier
Fri 6/264:40 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 5/20![Frontier logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/245:06 pm
STL
- PHL
2 stops30h 38m
Frontier
Sun 6/288:30 am
PHL
- STL
1 stop10h 00m
Frontier
Deal found 5/20![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/256:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Sun 6/286:30 am
PHL
- STL
1 stop27h 22m
Frontier
Deal found 5/20![Frontier logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Fri 6/265:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Sun 6/286:30 am
PHL
- STL
1 stop27h 22m
Frontier
Deal found 5/21![Frontier logo]()
$193
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 May 25, 2026.
Search for one-way flight options from St. Louis to Delaware. Find affordable one-way fares based on user searches. Data last updated May 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/21. 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 8/124:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 5/21![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 5/21. 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 7/146:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 5/21![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Fri 6/195:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Deal found 5/21![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 5/21. 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 6/166:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Deal found 5/21![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Fri 7/174:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 5/21![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 5/21. 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 6/186:31 pm
STL
- PHL
1 stop11h 48m
Frontier
Deal found 5/21![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/175:06 pm
STL
- PHL
2 stops21h 31m
Frontier
Deal found 5/20![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 5/21. 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 6/304:17 pm
STL
- PHL
1 stop15h 39m
Frontier
Deal found 5/21![Frontier logo]()
$120
This Priceline deal was found by Cheapflights users on 5/24. 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.
Thu 8/208:08 pm
STL
- PHL
1 stop8h 30m
Frontier
Deal found 5/24![Frontier logo]()
$129
This Super.com deal was found by Cheapflights users on 5/22. 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.
Mon 6/154:17 pm
STL
- PHL
1 stop6h 26m
Frontier
Deal found 5/22![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 5/20. 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.
Sun 5/316:33 pm
STL
- SBY
2 stops23h 58m
Multiple Airlines
Deal found 5/20![Multiple Airlines logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 6/111:24 am
STL
- SBY
1 stop7h 07m
Multiple Airlines
Deal found 5/20![Multiple Airlines logo]()
$321
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 May 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $124 (Kiwi.com) |
One-way from | $81 (Kiwi.com) |
Popular in | November |
Cheapest in | August |
Average price | $405 |
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 May 25, 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
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Wed 7/8
5:40 am-10:50 am
1 stop4h 10m
Philadelphia
Wed 7/8
5:05 pm-6:40 pm
Nonstop2h 35m
$287
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Wed 8/19
2:50 pm-11:50 pm
2 stops8h 00m
Philadelphia
Mon 8/24
10:20 am-5:55 pm
2 stops8h 35m
$328
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Mon 6/22
8:40 pm-11:50 pm
Nonstop2h 10m
Philadelphia
Wed 7/15
5:05 pm-6:40 pm
Nonstop2h 35m
$378
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Sun 6/28
5:50 am-12:05 pm
1 stop5h 15m
Philadelphia
Wed 7/1
6:20 am-7:40 am
Nonstop2h 20m
$388
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Thu 6/18
7:15 pm-12:20 am
1 stop4h 05m
Philadelphia
Tue 6/23
5:05 pm-6:40 pm
Nonstop2h 35m
$388
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Thu 7/2
3:35 pm-12:20 am
2 stops7h 45m
Philadelphia
Tue 7/7
4:35 pm-10:30 pm
1 stop6h 55m
$395
Quickest round-trip
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Mon 6/22
8:40 pm-11:50 pm
Nonstop2h 10m
Philadelphia
Fri 7/17
6:00 pm-7:30 pm
Nonstop2h 30m
$471
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Sat 6/20
1:00 pm-4:10 pm
Nonstop2h 10m
Philadelphia
Thu 6/25
8:00 am-2:10 pm
1 stop7h 10m
$473
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Fri 6/26
8:40 pm-11:50 pm
Nonstop2h 10m
Philadelphia
Sun 6/28
7:55 am-11:20 am
1 stop4h 25m
$481
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Thu 6/25
8:40 pm-11:50 pm
Nonstop2h 10m
Philadelphia
Sun 7/12
5:30 pm-11:45 pm
1 stop7h 15m
$481
Showing 1-10 of 31 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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