Dulles to Cahokia/St Louis (IAD–CPS) — Airlines, Schedules & Connections

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No nonstop flights on this route. connecting options below.

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Dulles to Cahokia/St Louis
Connecting service available through multiple hubs.
1 Airlines 10 1-stop hubs

IAD–CPS is served by 1 airline with nonstop service. Contour Aviation leads the route. Beyond nonstop, 10 hubs offer 1-stop connections.

Also explore IAD Routes CPS Routes IAD Live Flights CPS Live Flights IAD Delays
Carriers on this route

Airline Landscape

All carriers operating nonstop IAD–CPS service, compared side by side.
Airline Freq/wk Aircraft Duration Dep OTP Alliance Codeshares
LF Contour Aviation 1 – – 75% – –
Alliance coverage
Unaffiliated: LF (1 flights/wk, 100%)
OTP based on airport-level delay snapshots. Duration ranges reflect seasonal/directional variation.
Connections

Connection Landscape

Beyond nonstop. 1-stop and 2-stop options for IAD to CPS.
1-STOP
One-Stop Connections
10
Hubs
~3h
Fastest
~27h
Longest
PHL ~3h 54m PIT ~4h 21m SAV ~5h 4m RSW ~5h 20m PBI ~5h 31m
Verified with published schedule alignment and minimum connection time.
Connections computed from published schedules with minimum connection time verification. Use the interactive explorer above the fold to filter by airline, tier, and layover time.
Reliability

On-Time Performance

What to expect at each end of your journey.
Outbound
IAD → CPS
75%
Generally reliable. Most flights run on time.
Departing
75%
Return
CPS → IAD
84%
Generally reliable. Most flights run on time.
Arriving
84%
OTP = percentage of flights arriving within 15 min of schedule. Based on airport-level delay snapshots. IAD delays →
Know before you go

Travel Essentials

Practical planning for this route.
Time Difference
0h
Cahokia/St Louis is 0 hours the same as Dulles.
IAD: EDT · CPS: EDT

When it's 6:00 PM in Dulles, it's 6:00 PM in Cahokia/St Louis.
Getting to IAD

WMATA Silver Line Metro now reaches Dulles directly; take Silver Line to Washington Dulles Airport station (about 65 min from Metro Center, ~$7). The connection opened in late 2022.Ride-shares from downtown DC run $35–60 and take 35–50 minutes via I-66 (longer during peak hours). Washington Flyer coach to Wiehle-Reston East Metro costs $6. The airport is 27 miles from downtown; taxis are expensive ($60–80).

Facts

IAD–CPS Quick Facts

Key statistics for the Dulles to Cahokia/St Louis route.
Route details
Time difference0 hours
Airlines (nonstop)1
1-stop connections10 hubs
Origin: IAD
Full nameWashington Dulles International Airport
IATA / ICAOIAD / KIAD
TimezoneAmerica/New_York
Passengers/yr26.0M
Elevation312 ft / 95 m
Destination: CPS
Full nameSt Louis Downtown Airport
IATA / ICAOCPS / KCPS
TimezoneAmerica/Indiana/Vincennes
Elevation413 ft / 126 m
FAQ

Frequently Asked Questions

Common questions about IAD to CPS flights.
1 airline operates nonstop service: Contour Aviation.
Yes, 1-stop connections are available through PHL, PIT, SAV, RSW, PBI, ADS, SJC, LAX, JFK and DAL. These options provide additional schedule flexibility.
Click the 'Search Flights' button to check availability and prices on Google Flights. You can also compare airlines and schedules on this page to find the best option.
See the On-Time Performance section for the latest delay data at both airports. This shows departure and arrival reliability to help you plan.
Route data is updated regularly from official airline schedules. On-time performance data comes from recent airport delay snapshots.

Connecting Options and Alternatives

10 one-stop connections are available, with the fastest taking approximately 3 hours via PHL.